Patent Publication Number: US-10763220-B2

Title: Systems and methods for electromagnetic interference shielding

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 15/087,270, filed Mar. 31, 2016, which is incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD 
     This disclosure relates generally to electromagnetic interference (EMI) shielding. One or more embodiments regard a manufacturing process to provide an EMI shielding for an electronics package. One or more embodiments regard the EMI shielded packages produced using one of the manufacturing processes. 
     BACKGROUND ART 
     Electromagnetic sources can generate electrical signals that can cause Electromagnetic interference (EMI). EMI is an electromagnetic wave or signal generated by an external source that negatively affects a circuit. The electromagnetic wave or signal can affect the circuit through electromagnetic induction, electrostatic coupling, and/or conduction. The electromagnetic wave can degrade the performance of the circuit or even stop it from functioning. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A-1G  illustrate, by way of example, cross-section diagrams of an embodiment of a process for manufacturing a device with EMI shielding. 
         FIG. 1H  illustrates, by way of example, a cross section diagram of an embodiment of a package created using a process discussed with regard to  FIGS. 1A-1G . 
         FIGS. 2A-2B  illustrate, by way of example, cross-section diagrams of another embodiment of a process for manufacturing a device with EMI shielding. 
         FIGS. 3A-3B  illustrate, by way of example, cross-section diagrams of another embodiment of a process for manufacturing a device with EMI shielding. 
         FIGS. 4A-4B  illustrate, by way of example, cross-section diagrams of another embodiment of a process for manufacturing a die package with EMI shielding. 
         FIGS. 5A-5D  illustrate, by way of example, cross-section diagrams of an embodiment of another process for manufacturing a device with EMI shielding. 
         FIG. 5E  illustrates, by way of example, a cross section diagram of an embodiment of a package created using a process discussed with regard to  FIGS. 5A-5D . 
         FIG. 6A  illustrates, by way of example, a cross-section diagram of an embodiment of a system that includes a device (e.g., a device made using a process of  FIGS. 5A-5D ) electrically coupled to ground pads of the substrate. 
         FIG. 6B  illustrates, by way of example, a cross-section diagram of an embodiment of another system similar to the system of  FIG. 6A . 
         FIG. 7  illustrates, by way of example, a cross-section diagram of an embodiment of an electronic device which can include an EMI shielding as disclosed herein. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following description and the drawings sufficiently illustrate embodiments to enable those skilled in the art to practice them. Other embodiments can incorporate structural, logical, electrical, process, or other changes. Portions and features of some embodiments can be included in, or substituted for, those of other embodiments. Embodiments set forth in the claims encompass all available equivalents of those claims. 
     Embodiments discussed herein provide EMI shielding for an electronic package, such as a molded or unmolded system in package (SiP). Generally a metal foil or film is formed on and/or around the SiP such that the metal foil or film contacts ground circuitry (e.g., one or more ground pads, vias, traces, ground planes, or the like electrically connected to an electrical ground, on or at least partially in a surface of a substrate of the package). 
     An EMI shielding for an electronics package (e.g., a molded or unmolded system in package (SiP)) uses a physical vapor deposition (PVD) sputtering process to coat a mold surface with a conductive material. Another EMI shielding for an electronics package includes a metal can over the packaged device. Current physical shields and molded packages increase a footprint of the SiP. The sputtering process has some disadvantages, such as high cost of the sputtering equipment, increase in throughput time to increase sputtered conductive material thickness, complex process for uniform material coverage on package sidewalls, and mold surface pre clean to improve adhesion, among others. Using EMI shielding between components, laser trenches are made between components and filled with a conductive material. This laser trenching is performed using an expensive laser ablation process that adversely impacts cost and throughput time for manufacturing. 
     In one or more embodiments, individual die are EMI shielded by coating a conductive material (e.g., a foil or film of conductive material) on or over a die backside and die sidewalls. In one or more embodiments, the coating can be applied after die singulation at the wafer level. In one or more embodiments, individual or multiple dice can be flip-chip assembled on a package. In one or more embodiments, the assembled multi-chip package can be molded. One or more dice can then be connected to ground circuitry on, or at least partially in, the package substrate, such as by wire bonding or by conductive paste, for example. 
     EMI shielding the die backside and sidewalls reduces the SiP footprint (x-y direction, parallel to plane defined by die backside) and thickness (z direction, perpendicular to plane defined by die backside), such as to allow multiple EMI shielded dice to be more closely spaced in a package without interfering with each other electrically. Such shielding does not require molding and then sputter coating. Such shielding does not require an expensive laser ablation tool and long laser trench process time, such as is used when multiple components need to be shielded from one another. The use of a conductive foil, such as stainless steel, on the die backside for EMI shielding can also be designed as a stiffener to control package warpage. 
     The manufacturing processes discussed herein can provide one or more advantages over prior EMI shielding techniques and/or devices with EMI shielding. An advantage can include avoiding sputtering and the relatively high costs associated therewith. Another advantage can include a reduced throughput time as compared to a sputtering process. 
     A “foil” as used herein is a conductor, such as a substantially pure metal. A “film” as used herein is a combination of a dielectric material (e.g., an organic material) and a conductive material attached to each other. The remaining discussion refers to foils. However, it is to be understood that a film can be used in place of a foil. 
     EMI shielding by applying a conductive material to the die backside and/or sidewalls is applicable to flip chip, wire bonded, stacked, and/or embedded devices. Typical process flow operations and typical materials that can be used are described below and illustrated in the figures. However, the process flows are not limited to the listed materials and operations. 
     Using a film or foil in place of a sputtered material as described with regard to the preceding FIGS. provides a more robust (e.g., stronger, harder to break or penetrate, more reliable, or the like) EMI shielding. Unlike with sputtering material, a wider variety of metal and/or alloy compositions can be used. Using a film or foil, the thickness of the EMI shielding is not limited like it is using a sputtered material. The foil or film is generally denser and has fewer defects, such as voids, cracks, or other defects. Such defects can be detected using a microscope or inspection by the naked eye. The foil or film generally has a more uniform thickness over a curved surface as compared to a sputtered material. Such differences make the foil or film as discussed herein physically different from a sputtered material. Such differences can be detected by the naked eye or with the aid of a microscope. 
       FIGS. 1A-1G  illustrate, by way of example, cross-section diagrams of an embodiment of a method for forming a die package with EMI shielding.  FIG. 1A  illustrates, by way of example, a cross-section diagram of a system  100 A. The system  100 A, as illustrated, includes a wafer  102 , a wafer support  104 , interconnection circuitry  106 , and metallization  107  between electronic devices of the wafer  102 . 
     The wafer  102  can be thinned down to a desired thickness, such as by using a wafer grind process, for example. The wafer includes a backside  103  and an active side  105 . The active side  105  is opposite the backside  103 . The active side  105  is the side through which electrical signals can be received from the die. A wafer is sometimes referred to as a slice of a substrate. Generally a wafer is made of a semiconductor material, such as silicon. The wafer  102  is the medium in and/or on which an electronic device can be built. The wafer can be doped, etched, subject to deposition (or other technique) of conductive and/or dielectric material(s), and/or patterning of the materials. Electronic device(s) are singulated from the wafer  102  and packaged (described elsewhere herein). 
     The wafer support  104  can be a rigid material. The wafer support  104  can include silicon, metal, and/or glass, among other rigid materials. A tacky material  101  (e.g., an adhesive) can be coated or otherwise situated on the wafer support  104 . The tacky material  101  can include a thermal release tape, thermoplastic, polyimide adhesive film, Poly-vinyl chloride (PVC) film, pressure sensitive acrylic based adhesive, ultra-violet (UV) release film, and/or a polyester based adhesive, among others. Objects can be coupled to the wafer support  104  through the tacky material  101 . 
     Devices on a wafer are separated by areas called “streets” (analogous to a street around a home), referred to herein as the metallization  107 . The top surface of the street area is usually populated with test and alignment features that contain metal (usually Cu, Al) conductors embedded in dielectric material. This material is generally removed by a laser ablation (sometimes called laser scribe) method prior to singulation of the die from the wafer  102 . 
       FIG. 1B  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 B that includes the system  100 A after metallization  107  between active die regions is removed. Removal of the metallization  107  leaves a void  108 , sometimes referred to as a trench, where the metallization  107  and/or portions of the wafer  102  were removed. The metallization  107  can be removed using a laser scribe, plasma etching, ion etching, mechanical saw, and/or mechanical abrasion process, in one or more embodiments. 
       FIG. 1C  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 C that includes the system  100 B after a cut (sometimes called “Z1”) into the void  108 . The cut creates a deeper void  110  in at least a portion of the void  108 . The void  110 , sometimes referred to as a trench, can be narrower in width than the void  108  (as indicated by arrows  109  and  111 , respectively. 
       FIG. 1D  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 D that includes the system  100 C with the interconnection circuitry  106  on another wafer support  114 . The system  100 C is flipped over onto the wafer support  114  such that the interconnection  106  is in contact with the wafer support  114 , as shown in  FIG. 1D . 
     The wafer support  114  is a material that provides an area on which the interconnection circuitry  106  can be placed, such as without slipping or damaging the interconnection circuitry  106 . The wafer support  114  can include an elastomeric material (e.g., a silicone, rubber, or the like), such as to help cushion the wafer  102 . 
     The system  100 D includes a saw  112  singulating individual devices from the wafer  102 . The saw  112  can include a bevel saw. The saw  112  cuts all the way through the wafer  102  or at least partially into the wafer support  114 . The saw  112  can be situated in the void(s)  108  and/or  110 . The saw  112  can cut through the portion of the wafer  102  remaining between the void  110  and the active side  105 . The saw  112  singulates individual dies  116  (see  FIG. 1E ) from the wafer  102 . 
       FIG. 1E  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 E that includes the dies  116  singulated from one another. The dies  116  each include an optional undercut  115 . The undercut  115  can be an artifact of removing the metallization  107  (i.e. part of the void  110  remaining after the singulation with the saw  112 ). The undercut  115  can be removed by modulating the width of the cut created to remove the metallization  107  to be less than or equal to a width of the saw  112  at the point where the saw  112  cuts the wafer  102  near the void  108 . 
       FIG. 1F  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 F that includes the system  100 E after a conductive material  118  is coated on the die backside  113  and/or sidewalls  119 . The conductive material  118  can include one or more of titanium, chromium, tungsten, nickel, vanadium, platinum, palladium, cobalt, silver, gold, or a combination thereof, among others. Titanium, titanium-tungsten, and/or chromium in the conductive material  118  can help improve conductive material adhesion to the die  116 . Nickel-vanadium, nickel, platinum, palladium, and/or cobalt in the conductive material  118  can help improve a diffusion barrier between the conductive material  118  and the die  116 . Silver and/or platinum in the conductive material  118  can help improve conductive material resistance to oxidation. 
     The conductive material  118  can at least partially fill the undercut  115 , in one or more embodiments. In such embodiments, conductive material  118  is on the active side  117  of the die  116 . The conductive material  118  can be coated on the die backside  113  and/or sidewalls  119  (see  FIG. 1E ) using a sputtering, spray coating, plating, paste printing, and/or roller coating process, among others. 
       FIG. 1G  illustrates, by way of example, a cross-section diagram of an embodiment of a system  100 G that includes the system  100 F after conductive material  118  between dice  116  is removed. Such conductive material removal singulates the dice  116  from each other and/or electrically isolates the dice  116  from each other. The conductive material  118  between the dice  116  can be removed using a laser ablation, chemical etching, ion etching, mechanical particle abrasion, and/or saw process, among others. The devices can be removed from the wafer support  114 , such as to be assembled in a package (see  FIGS. 4A and 4B , for example). 
       FIG. 1H  illustrates, by way of example, a cross-section diagram of an embodiment of a device  100 H produced using a process as described with regard to  FIGS. 1A-G . The device  100 H as illustrated includes a die  116  with the conductive material  118  adhered directly to the die  116 . The conductive material  118  as illustrated covers a die backside  113  and sidewalls  119 . The conductive material  118  also covers other sides of the die  116  that are not shown in the cross-section. The conductive material  118  is illustrated as filling the undercut  115 . The interconnection circuitry  106  are electrically coupled to connection circuitry (e.g., one or more pad(s), via(s), bus(es) trace(s), or the like) of the die  116 . 
       FIG. 2A  illustrates, by way of example, a cross-section diagram of an embodiment of a system  200 A that includes the system  100 E after a conductive paste  220  is situated on and/or around the dies  116 . The conductive paste  220  can include a polymer. The polymer can include conductive particles mixed therein. The conductive particles can include one or more of metallic particles, magnetic particles, carbon particles, and/or graphite particles, or the like. The conductive paste  220 , in one or more embodiments, can be coated on the die backside  113 , sidewalls  119 , and/or in the undercut  115 . The conductive paste  220  can be applied by print, screen, spray or other coating technique(s). The conductive paste  220  can be exposed to heat, such as to cure the conductive paste  220 . 
       FIG. 2B  illustrates, by way of example, a cross-section diagram of an embodiment of a system  200 B that includes the system  200 A with the conductive paste  220  being cut (indicated by the arrows  224 ) using laser ablation or a saw. The cut can singulate the dies  116  from each other. The device produced can be removed from the wafer support  114  and can be assembled into a package (see  FIGS. 4A-4B , for example). The resultant device is similar to the device  100 H with the conductive material  118  being a conductive paste instead of a sputtered conductive material. 
       FIG. 3A  illustrates, by way of example, a cross-section diagram of an embodiment of a system  300 A that includes the system  200 A after the cured conductive paste  220  and dies  116  are flipped and coupled to the wafer support  104 , such as through the tacky material  101 . A top surface  221  of the conductive paste  220  is in contact with the wafer support  104 . A bottom surface  223  of the conductive paste  220  faces away from the wafer support  104 . 
       FIG. 3B  illustrates, by way of example, a cross-section diagram of an embodiment of a system  300 B that includes the system  300 A being cut, such as to singulate dies  116  from one another. The cut can be through the cured conductive paste  220  to the wafer support  104 . The cut can performed using the saw  224 , a laser, or other cutting device. Cutting from the bottom surface  223  to the top surface  221  as shown in  FIG. 39  can help position the cutting tool (e.g., saw  224 ) more precisely between devices  116  as compared to cutting from the top surface  221  to the bottom surface  223  as shown in  FIG. 2B . This cut is sometimes referred to as a Z1 cut. The resultant device is similar to the device  100 H with the conductive material  118  being a conductive paste instead of a sputtered conductive material. 
       FIG. 4A  illustrates, by way of example, a cross-section diagram of an embodiment of a system  400 A that includes a device (e.g., a device made using the process of  FIGS. 1A-1G, 2A-2B , and/or  3 A- 3 B) electrically coupled to connection circuitry  434  of a substrate  432 . The system  400 A as illustrated includes a device  116  with a conductive material  222  (e.g., a sputtered conductive material  118  or conductive paste  220 ) over five sides thereof (a top surface  113  and four side surfaces  119 ). The device  116  includes the connectors  106  electrically coupled to pads  434  and other connection circuitry  436  (vias, buses, or the like). The substrate  432  can be a bumpless buildup layer (BBUL) substrate, such as can include a plurality of buildup layers (e.g., Ajinomoto buildup layers), laminated material including glass fiber, such as can include FR4 or FR5 material. 
     The system  400 A as illustrated further includes a molding material  427  between the interconnection circuitry  106  and/or around the die  116 , such as on the conductive material  222 . The molding material  427  is an insulating material (i.e. a dielectric), such as can include epoxy resins that are thermoplastic or thermosets, such as cresol novolac or bisphenol. Additionally or alternatively, the molding material  427  can include inorganic filler, catalyst, flame retardant, stress modifier, and/or an adhesion promoter, among others. The conductive material  222  is connected to a ground pad  430  (a pad electrically coupled to electrical ground) and/or other ground circuitry through a wire  426 . The wire  426  is electrically coupled to the conductive material  222  and the ground pad  430 , such as to connect the conductive material  222  to electrical ground. Such a configuration makes the conductive material  222  act as an EMI shield for the die  116 . Alternatively, tape bonding the conductive material  422  to the ground pad  430  can be used in place of the wire bonding shown in  FIG. 4A . 
       FIG. 4B  illustrates, by way of example, a cross-section diagram of an embodiment of another system  400 B. The system  400 B is similar to the system  400 A with the system  400 B including a conductive paste  438  (similar to the conductive paste  220 ) electrically coupling the conductive material  222  to the ground pad  430  and/or other ground circuitry, rather than the wire  426  as in the system  400 A. The system  400 B can be created by flip chip, wire bond, or stacked die attaching the interconnection circuitry  106  to pads  434 . The molding material  427  can then be situated around the connections  106 , the bottom surface  117 , and/or the conductive material  222  around the bottom surface  117 . The conductive paste  438  can be deposited using a syringe dispense method, in one or more embodiments. 
       FIG. 5A  illustrates, by way of example, a cross-section diagram of an embodiment of a system  500 A. The system  500 A as illustrated includes the wafer  102 , interconnection circuitry  106 , wafer supports  104  and  114 , an adhesive  536 , and a conductive foil  534 . 
     The bottom surface  105  of the wafer  102  faces the wafer support  114  and the active surface  103  of the wafer  102  faces away from the wafer support  114 . The wafer  102  is attached to the wafer support  114 , such as to protect the interconnection circuitry  106 . In one or more embodiments, the adhesive  536  can be laminated on the top surface  103  of the wafer  102  without the conductive foil  534 . In one or more embodiments, the adhesive  536  and the conductive foil  534  can be laminated together on the top surface  103  of the wafer  102 . The conductive foil  534  and adhesive  536  can be laminated on the wafer  102  after the wafer  102  is attached to the wafer support  114 . 
     The adhesive  536  can include a thermal plastic or other adhesive. Example adhesives include glue(s), pressure sensitive adhesives, spray adhesives, fabric adhesives, epoxy, and polyurethane, among others. 
     The conductive foil  534  can include copper, nickel coated copper, or tin coated copper, or the like. Such materials can be easily connected to the ground pads  430  (see  FIGS. 6A-6B ) by wire bonding. The foil  534  can include a conductive material, such as copper, aluminum, gold, titanium, silver, stainless steel, a laminate conductive material, or a combination thereof, among others. A film, which can be used in place of the foil  534 , can include a foil attached to another layer of material, such as can include an organic material, such as polypropylene, polyethylene terephthalate, and/or polyethylene, among others. The organic material of the film can be chosen for its bonding characteristics (its ability to be attached to the wafer  102  using the adhesive  536 ). Such configurations are beneficial when the foil  534  alone does not bond well to the wafer  102 . In one or more embodiments, the conductive foil  534  can include stainless steel. The stiffness of a stainless steel (or a material with a similar stiffness) can help reduce package warpage. 
       FIG. 5B  illustrates, by way of example, a cross-section diagram of an embodiment of a system  500 B that includes the system  500 A after flipping the wafer  102  and creating the void  108 . The system  500 A can be removed from the wafer support  114 , flipped over, and attached to the wafer support  104 . Flipping the wafer  102  puts the conductive foil  534  on the wafer support  104 . The top surface  103  of the wafer faces the wafer support  104 . The bottom surface  105  of the wafer  102  faces away from the wafer support  104 . 
     The void  108  is created by removing metallization  107  between dies on the wafer  102 , such as is discussed with regard to  FIG. 1B . The difference in  FIG. 5B  is that the conductive foil  534  is on the wafer support  104  while in  FIG. 1B , the system  100 B does not include the conductive foil  534  or the adhesive  536  and the top surface  103  of the wafer  102  is on the wafer support  104 . 
       FIG. 5C  illustrates, by way of example, a cross-section diagram of an embodiment of a system  500 C that includes the system  500 B after a cut (sometimes called “Z1”) into the void  108 . The cut creates a deeper void  110  in at least a portion of the void  108 . The void  110  can be narrower in width than the void  108  (as indicated by arrows  109  and  111 , respectively). 
       FIG. 5D  illustrates, by way of example, a cross-section diagram of an embodiment of a system  500 D that includes the system  500 C with a saw  112  singulating individual devices from the wafer  102 . The saw  112  can include a bevel saw. The saw  112  cuts all the way through the wafer  102  or at least partially into the wafer support  104 . The saw  112  can be situated to cut in the void(s)  108  and/or  110 . The saw  112  can cut through the portion of the wafer  102  remaining between the void  110  and the active side  105 . The saw  112  singulates individual dies  638  (see  FIG. 5E ) from the wafer  102 . 
       FIG. 5E  illustrates, by way of example, a cross-section diagram of a device  500 E produced using a process as described with regard to  FIGS. 5A-5D . The device  500 E as illustrated includes a die  638  with the conductive foil  534  adhered to the top surface  113  of the die  638  using the adhesive  536 . The conductive foil  534  as illustrated covers the die backside  113  and does not cover any of the sidewalls  119 . The undercut  115  (a byproduct of crating the void  108  by removing the metallization between dies) is not filled with conductive material in the embodiment shown. The interconnection circuitry  106  can be electrically coupled to connection circuitry (e.g., one or more pad(s), via(s), bus(es) trace(s), or the like) of the die  638 . 
       FIG. 6A  illustrates, by way of example, a cross-section diagram of an embodiment of a system  600 A that includes a device (e.g., a device made using a process of  FIGS. 5A-5D ) electrically coupled to ground pads  430  and/or other ground-connected connection circuitry of the substrate  432 . The system  600 A as illustrated includes the device  638  with the conductive foil  534  on only a top surface  113  of the device  638 . The device  116  includes the connectors  106  electrically coupled to pads  434  and other connection circuitry  436  (vias, buses, or the like). 
     The system  600 A as illustrated further includes the molding material  427  between the interconnection circuitry  106 , on the substrate  432 , and/or around the die  116 , such as in the undercut  115 . The molding material  427 , in one or more embodiments, fills the undercut  115 . The conductive foil  534  is connected to a ground pad  430  (a pad electrically coupled to electrical ground) through the wire  426 . The wire  426  is electrically coupled to the conductive foil  534  and the ground pad  430  and/or other ground-connected connection circuitry, such as to connect the conductive foil  534  to electrical ground. Such a configuration makes the conductive foil  534  act as an EMI shield for the die  638 . Alternatively, tape bonding the conductive foil  534  to the grounding pad  430  can be used in place of wire bonding. 
       FIG. 6B  illustrates, by way of example, a cross-section diagram of an embodiment of another system  600 B. The system  600 B is similar to the system  600 A with the system  600 B including a conductive paste  438  (similar to the conductive paste  220 ) electrically coupling the conductive foil  534  to the ground pad  430  (rather than the wire  426  as shown in  FIG. 6A ). The system  600 B can be created by flip chip attaching (or other method of attaching) the interconnection circuitry  106  to pads  434 . The molding material  427  can then be situated around the connections  106 , the bottom surface  117 , on the substrate  432 , and/or the in the undercut  115 . The conductive paste  438  can be deposited using a syringe dispense method, in one or more embodiments. 
     A singulation (e.g., a die singulation or material removal that results in die separation physically and or electrically) that is performed using a laser produces a different physical structure than one that is performed using a saw process. The saw process leaves sides of dies (for example) beveled, while a laser singulation process leaves sides of dies less beveled as compared to the saw process. Both of the processes leave sides that are generally perpendicular to a major plane defined by a surface of the die backside. However, an angle formed between the side and the die backside using the saw process is less than an angle formed between the side and the die backside using the laser process. Additionally, the laser process leaves a different grain structure on the sides of the dies as compared to the saw process. This difference is detectable under a microscope and sometimes even by feeling the die. The saw process generally leaves a more bumpy side, while the laser process leaves a smoother side. 
       FIG. 7  shows a block diagram example of an electronic device which can include an EMI shielding as disclosed herein. An example of an electronic device using one or more packages with one or more higher resistance via is included to show an example of a device application for the present disclosure. Electronic device  700  is merely one example of a device in which embodiments of the present disclosure can be used. Examples of electronic devices  700  include, but are not limited to, personal computers, tablet computers, supercomputers, servers, telecommunications switches, routers, mobile telephones, personal data assistants, MP3 or other digital music players, radios, or the like. 
     In the example of  FIG. 7 , electronic device  700  comprises a data processing system that includes a system bus  702  to couple the various components of the system. System bus  702  provides communications links among the various components of the electronic device  700  and can be implemented as a single bus, as a combination of busses, or in any other suitable manner. 
     An electronic assembly  710  is coupled to system bus  702 . The electronic assembly  710  can include a circuit or combination of circuits. In one embodiment, the electronic assembly  710  includes a processor  712  which can be of any type. As used herein, “processor” means any type of computational circuit, such as but not limited to a microprocessor, a microcontroller, a complex instruction set computing (CISC) microprocessor, a reduced instruction set computing (RISC) microprocessor, a very long instruction word (VLIW) microprocessor, a graphics processor, a digital signal processor (DSP), multiple core processor, or any other type of processor or processing circuit. 
     Other types of circuits that can be included in electronic assembly  710  are a custom circuit, an application-specific integrated circuit (ASIC), or the like, such as, for example, one or more circuits (such as a communications circuit  714 ) for use in wireless devices like mobile telephones, pagers, personal data assistants, portable computers, two-way radios, and similar electronic systems. The IC can perform any other type of function. 
     The electronic device  700  can include an external memory  720 , which in turn can include one or more memory elements suitable to the particular application, such as a main memory  722  in the form of random access memory (RAM), one or more hard drives  724 , and/or one or more drives that handle removable media  726  such as compact disks (CD), digital video disk (DVD), and the like. 
     The electronic device  700  can also include a display device  716 , one or more speakers  718 , and a keyboard and/or controller  730 , which can include a mouse, trackball, touch screen, voice-recognition device, or any other device that permits a system user to input information into and receive information from the electronic device  700 . 
     Additional Notes and Examples 
     In Example 1 a device with electromagnetic interference (EMI) shielding can include a substrate including electrical connection circuitry therein, grounding circuitry on, or at least partially in the substrate, the grounding circuitry at least partially exposed by a surface of the substrate, a die electrically connected to the connection circuitry and the grounding circuitry, the die on the substrate, a conductive material on a die backside, and a conductive paste or one or more wires electrically connected to the grounding circuitry and the conductive material. 
     In Example 2 the device of Example 1 can include one or more undercuts on an active side of the die, the active side facing the substrate and opposite the die backside. 
     In Example 3 the device of Example 2 can include, wherein the conductive material is a sputtered conductor or a conductive paste, the conductive material is directly on the die backside, and wherein the conductive material fills the one or more undercuts. 
     In Example 4 the device of Example 3 can include, wherein the conductive material covers the die backside, covers four sides of the die generally perpendicular to a plane defined by the die backside, and partially covers an active side of the die, the active side of the die opposite the die backside. 
     In Example 5 the device of Example 1 can include, wherein the conductive material includes a conductive film or conductive foil only on the die backside and the device further comprises an adhesive directly on the die backside adhering the conductive film or conductive foil to the die backside. 
     In Example 6 the device of at least one of Example 1-5 can include, wherein the grounding circuitry is one or more ground pads on or at partially in the substrate, each of the ground pads electrically coupled to logical ground of the substrate. 
     In Example 7 the device of at least one of Examples 1-6 can include one or more solder balls electrically and mechanically connected to the active side of the die and the electrical connection circuitry of the substrate. 
     In Example 8 the device of at least one of Examples 1-7 can include, wherein the conductive paste or one or more wires is the conductive paste. 
     In Example 9 the device of at least one of Examples 1-7 can include, wherein the conductive paste or one or more wires is the one or more wires. 
     In Example 10 the device of at least one of Examples 1-9 can include a molding material situated on the substrate, on an active surface of the die, on conductive material on the active surface of the die, and on conductive material on the sides of the die. 
     In Example 11 a method for providing electromagnetic interference (EMI) shielding for a die can include removing metallization between dies of a wafer of dies to create a first trench in the wafer, cutting into the first trench to create a deeper trench in the first trench, singulating dies from the wafer by cutting the wafer at locations corresponding to the first trench and the deeper trench, sputtering a conductive material or depositing a conductive paste over the dies to cover a die backside and four sides of each of the dies, and singulating the dies by removing conductive material between the dies or cutting through the conductive paste to a wafer support. 
     In Example 12 the method of Example 11 can include, wherein sputtering a conductive material or depositing a conductive paste over the dies to cover a die backside and four sides of each of the dies is depositing the conductive paste over the dies to cover a die backside and four sides of each of the dies. 
     In Example 13 the method of Example 11 can include, wherein sputtering a conductive material or depositing a conductive paste over the dies to cover a die backside and four sides of each of the dies is sputtering a conductive material over the dies to cover a die backside and four sides of each of the dies. 
     In Example 14 the method of at least one of Examples 11-13 can include, wherein singulating dies from the wafer by cutting the wafer at locations corresponding to the first trench and the deeper trench includes singulating the dies from the wafer such that the first trench forms one or more undercuts on an active side of the die, the active side of the die opposite the die backside and facing the substrate, and wherein sputtering a conductive material or depositing a conductive paste over the dies to cover a die backside and four sides of each of the dies includes filling the one or more undercuts with the conductive material or conductive paste. 
     In Example 15 the method of at least one of Examples 11-14 can include attaching the singulated die to a substrate including electrically connecting a ground pad on or at least partially in the substrate to the conductive material or conductive paste using a wire or conductive paste. 
     In Example 16 the method of Example 15 can include injecting a molding material between the substrate and the active side of the die. 
     In Example 17 the method of Example 16 can include, wherein injecting the molding material includes injecting the molding material to be in contact with the conductive material or conductive paste on an active side of the die and two or more sides of the die that are generally perpendicular to a major plane of the active surface of the die, and on an a surface of the substrate facing the active side of the die. 
     In Example 18 the method of Example 16 can include, wherein sputtering a conductive material or depositing a conductive paste over the dies to cover a die backside and four sides of each of the dies is depositing the conductive paste over the dies to cover a die backside and four sides of each of the dies and the method further comprises curing the deposited conductive paste. 
     In Example 19 the method of Example 18 can include flipping the devices with cured conductive paste, and prior to singulating the dies from the wafer, attaching the flipped devices to a wafer support so that the active side of the dies face away from the wafer support. 
     In Example 20 a method for providing electromagnetic interference (EMI) shielding for a die can include adhering, using an adhesive, a conductive foil or conductive film to a backside of a wafer of dies, after attaching the conductive foil or conductive film, removing metallization on an active side of the wafer and between dies of the wafer of dies to create a first trench in the wafer, the active side of the wafer opposite the backside of the wafer, cutting into the first trench to create a deeper trench in the first trench, and singulating dies from the wafer by cutting the wafer at locations corresponding to the first trench and the deeper trench. 
     In Example 21 the method of Example 20 can include after attaching the conductive foil or conductive film and before removing the metallization, attaching the wafer of dies to a wafer support such that the conductive foil is in contact with the wafer support. 
     In Example 22 the method of at least one of Examples 20-21 can include, wherein singulating dies from the wafer by cutting the wafer at locations corresponding to the first trench and the deeper trench includes singulating the dies from the wafer such that the first trench forms one or more undercuts on the active side of the die. 
     In Example 23 the method of at least one of Examples 20-22 can include attaching the singulated die to a substrate including electrically connecting a ground pad on or at least partially in the substrate to the conductive material or conductive paste using a wire or conductive paste. 
     In Example 24 the method of Example 23 can include injecting a molding material between the substrate and the active side of the die. 
     In Example 25 the method of Example 24 can include, wherein injecting the molding material includes injecting the molding material to be in contact with the conductive material or conductive paste on an active side of the die and two or more sides of the die that are generally perpendicular to a major plane of the active surface of the die, and on an a surface of the substrate facing the active side of the die. 
     The above description of embodiments includes references to the accompanying drawings, which form a part of the description of embodiments. The drawings show, by way of illustration, specific embodiments in which the invention can be practiced. These embodiments are also referred to herein as “examples.” Such examples can include elements in addition to those shown or described. However, the present inventors also contemplate examples in which only those elements shown or described are provided. Moreover, the present inventors also contemplate examples using any combination or permutation of those elements shown or described (or one or more aspects thereof), either with respect to a particular example (or one or more aspects thereof), or with respect to other examples (or one or more aspects thereof) shown or described herein. 
     In this document, the terms “a” or “an” are used, as is common in patent documents, to include one or more than one, independent of any other instances or usages of “at least one” or “one or more.” In this document, the term “or” is used to refer to a nonexclusive or, such that “A or B” includes “A but not B,” “B but not A,” and “A and B,” unless otherwise indicated. In this document, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Also, in the following claims, the terms “including” and “comprising” are open-ended, that is, a system, device, article, composition, formulation, or process that includes elements in addition to those listed after such a term in a claim are still deemed to fall within the scope of that claim. Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels, and are not intended to impose numerical requirements on their objects. 
     The above description is intended to be illustrative, and not restrictive. For example, the above-described examples (or one or more aspects thereof) can be used in combination with each other. Other embodiments can be used such as by one of ordinary skill in the art upon reviewing the above description. The Abstract is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Also, in the above description of embodiments, various features can be grouped together to streamline the disclosure. This should not be interpreted as intending that an unclaimed disclosed feature is essential to any claim. Rather, inventive subject matter can lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the description of embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that such embodiments can be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.