Abstract:
A method for upgrading or remediating semiconductor devices utilizing a remediation, adaptation, modification or upgrade chip in a piggyback configuration with a primary bare chip to achieve an upgrade, modification or adaptation of the primary chip or remedy a design or fabrication problem with the primary chip.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This is a application is a divisional of application Ser. No. 08/654,725, filed May 29, 1996, abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an apparatus and a method for upgrading or remediating semiconductor devices. In particular, the present invention relates to utilizing a remediation, modification or upgrade chip or other component in a piggyback configuration with an existing bare chip assembly to achieve an upgrade, modify chip operating parameters or remedy a design or fabrication problem. 
     2. State of the Art 
     Definitions: The following terms and acronyms will be used throughout the application and are defined as follows: 
     BGA—Ball Grid Array: An array of minute solder balls disposed on an attachment surface of a semiconductor die wherein the solder balls are refluxed for simultaneous attachment and electrical communication of the semiconductor die to a printed circuit board. 
     COB—Chip On Board: The techniques used to attach semiconductor dice to a printed circuit board or similar carrier substrate, including flip chip attachment, wirebonding, and tape automated bonding (“TAB”). COB also references the resulting end product. 
     Flip Chip: A chip or die that has a pattern or array of terminations spaced around the active surface of the die for face down mounting of the die to a substrate. 
     Flip Chip Attachment: A method of attaching a semiconductor die to a substrate in which the die is inverted so that the connecting conductor pads on the face of the device are set on mirror-image pads on the substrate (such as a printed circuit board) and generally bonded by solder reflux or a conductive polymer curing. 
     Glob Top: A glob of encapsulant material (usually epoxy or silicone or a combination thereof) surrounding a semiconductor die in a COB assembly. 
     PGA—Pin Grid Array: An array of small pins extending substantially perpendicularly from the major plane of a semiconductor die, wherein the pins conform to a specific arrangement on a printed circuit board or other substrate for attachment thereto. 
     SLICC—Slightly Larger than Integrated Circuit Carrier: An array of minute solder balls disposed on an attachment surface of a semiconductor die similar to a BGA, but having a smaller solder ball pitch and diameter than a BGA. 
     TAB—Tape Automated Bonding: A conductor placement structure wherein conductive traces preformed on a dielectric film or flexible sheet, such as a polyimide, are used to electrically connect bond pads of a semiconductor die to conductors of a carrier such as a leadframe or printed circuit board. 
     State-of-the-art COB technology generally consists of three semiconductor die-to-printed circuit board conductive attachment techniques: flip chip attachment, wirebonding, and TAB. 
     Flip chip COB attachment consists of attaching a semiconductor die, generally having a BGA, a SLICC or PGA, to a printed circuit board. With the BGA or SLICC, the solder or other conductive ball arrangement on the semiconductor die must be a mirror-image of the connecting bond pads on the printed circuit board such that precise connection is made. The semiconductor die is bonded to the printed circuit board by refluxing the solder balls. With the PGA, the pin arrangement of the semiconductor die must be a mirror-image of the pin recesses on the printed circuit board. After insertion, the semiconductor die is generally bonded by soldering the pins into place. In all of the foregoing techniques, insulative underfill encapsulant is generally disposed between the semiconductor die and the printed circuit board for environmental protection and to enhance the attachment of the die to the board. 
     Wirebonding and TAB attachment to produce a COB generally begin with attaching a semiconductor die to the surface of a printed circuit board with an appropriate adhesive, such as an epoxy. In wirebonding, a plurality of bond wires is extended and attached, one at a time, between each bond pad on the semiconductor die and a corresponding lead or trace end on the printed circuit board. The bond wires are generally attached through one of three industry-standard wirebonding techniques: ultrasonic bonding—using a combination of pressure and ultrasonic vibration bursts to form a metallurgical cold weld; thermocompression bonding—using a combination of pressure and elevated temperature to form a weld; and thermosonic bonding—using a combination of pressure, elevated temperature, and ultrasonic vibration bursts. With TAB, ends of metal traces carried on an insulating tape or film such as a polyimide are respectively gang-bonded using thermocompression techniques to the bond pads on the semiconductor die and to the lead or trace ends on the printed circuit board. An encapsulant is generally subsequently applied over the die and attendant the bond wires to prevent contamination or any physical damage to the assembly. 
     During a production run of an integrated circuit, a design parameter may change or a design or fabrication error may be detected in one or more circuits of a semiconductor chip. When such occur, the semiconductor chips of that production run may have to be scrapped if not exhibiting at least minimum performance characteristics. Although it may be possible to remediate the semiconductor chips with the addition of an adjacent chip or other circuit on the board, increased miniaturization of components and the boards to which they are mounted, as well as greater packaging density of integrated circuit assemblies, reduces or eliminates the potential space or “real estate” on the board upon which to locate remediation or upgrade circuitry or chips. Further, in many instances, it would be desirable to employ semiconductor dice in circuits for which they were not initially designed or intended, such as employing a die having a lower voltage requirement in a circuit providing a higher voltage power input. Such adaptability of dice to various operating environments may be significant, and even critical, during cycles in the industry wherein certain components are in short supply and others might be substituted if a viable technique for doing so existed. 
     U.S. Pat. No. 5,012,323 issued Apr. 30,.1991, to Farnworth teaches combining a pair of dice mounted on opposing sides of a leadframe. An upper, smaller die is back-bonded to the upper surface of the leads of the leadframe via a first adhesively coated, insulated film layer. A lower, larger die is face-bonded to the lower leadframe die bonding region via a second, adhesively coated, insulative, film layer. The wirebonding pads on both the upper die and lower die are interconnected with the ends of their associated lead extensions with gold or aluminum bond wires. The lower die must be slightly larger than the upper die in order that the die pads are accessible from above through a bonding window in the leadframe such that gold wire connections can be made to the lead extensions. 
     U.S. Pat. No. 5,128,831 issued Jul. 7, 1992, to Fox et al. teaches vertically stacked die, each in a sub-module, the sub-modules connected by solder-filled vias and the assembly connected to a board through a PGA. 
     U.S. Pat. No. 5,291,061 issued Mar. 1, 1994, to Ball teaches a multiple stacked die device containing up to four stacked die supported on a dice attach paddle of a leadframe, the assembly not exceeding the height of then-current single die packages, and wherein the bond pads of each die are wirebonded to lead fingers. The low profile of the device is achieved by close-tolerance stacking which is made possible by a low-loop-profile wirebonding operation and thin, adhesive layers between the stacked dice. 
     U.S. Pat. No. 5,323,060 issued Jun. 21, 1994, to Fogal et al. teaches a multichip module that contains stacked die devices, the terminals or bond pads of which are wirebonded to a substrate or to adjacent die devices. 
     U.S. Pat. No. 5,422,435 to Takiar et al. teaches dice stacked to form a multi-chip module (CM) and having wire bonds extending to each other and to the leads of a conductor-bearing carrier member such as a -leadframe. 
     U.S. Pat. No. 5,434,745 issued Jul. 18, 1995, to Shokrgozar et al. teaches a structure similar to that of Fox et al. with stacked sub-modules electrically connected at their peripheries by a conductive epoxy. 
     U.S. Pat. No. 5,438,224 issued Aug. 1, 1995, to Papageorge et al. teaches a multi-die assembly employing face-to-face dice connected to an interposed TAB tape or flex circuit, which in turn is connected to an underlying board. 
     U.S. Pat. No. 5,455,445 issued Oct. 3, 1995, to Kurtz et al. teaches an MCM of vertically stacked dice employing vias extending through the semiconductor material of the die substrates for vertical electrical interconnection. 
     All of the above mentioned patents relate to increasing conductor-bearing integrated circuit density. However, none of these patents deal with remediating, modifying or upgrading semiconductors and semiconductor assemblies. 
     Therefore, it would be advantageous to develop a technique and assembly for remediating, adapting, modifying or upgrading semiconductor die assemblies using remediation, adaptation, modification or upgrade chips in combination with commercially available, widely practiced semiconductor device fabrication techniques. 
     SUMMARY OF THE INVENTION 
     The present invention relates to an apparatus and a method for upgrading, adapting, modifying or remediating semiconductor devices utilizing a remediation or upgrade chip in a piggyback configuration with an existing bare chip assembly to achieve an upgrade, adapt to an assembly, modify an operating parameter or remedy a design or fabrication problem. 
     As mentioned above, during a production run of an integrated circuit, a design parameter may change, a design or fabrication error may be detected in a semiconductor chip or the like. When such problems are encountered, the semiconductor chips of that production run might normally be scrapped. Although it may be possible to remediate such a semiconductor chip with the addition of a circuit to the board on which the chip resides, increased miniaturization of boards and cards and greater packaging density of integrated circuits eliminates the potential space or “real estate” upon which to locate remediation or upgrade circuitry or chips. 
     Further, it may be desirable to upgrade an unflawed but obsolete chip design while a new design is being developed and introduced so as to maintain market share and serve customer needs. 
     In addition, the viability of adapting chips to operating environments, such as power sources for which a particular chip is not designed, is extremely desirable, especially during periodic component shortages. One specific example would be use of a regulator to enable a 3.3 V pail to access a 5 V system. Another example of an operating environment adaptation would be the addition of an output driver to strengthen a chip&#39;s signal output to a circuit which would not respond to the chip&#39;s original signal. 
     The present invention solves the real estate problem by mounting the remediation chip on a face surface of the original chip (the term “remediation” or “remediating” will be used for purposes of this application to mean either remediating the original die to fix an error, adapting the original die to meet at least one changed design or operating parameter, upgrading the original die with additional circuitry, or the like). 
     The basic assembly of the present invention comprises an original or primary die with a patch or remediation die adhered thereto. The patch die is attached to the primary die by a layer of adhesive. The adhesive is preferably an electrically insulative adhesive, as required or desired, to electrically isolate the primary die from the patch die. Depending on the adhesive, the assembly might be “cured” to affix the dice together. It is, of course, understood that other types of adhesives, such as a pressure sensitive adhesive or a tape segment carrying the same, could be used to hold the dice together. 
     Generally, both the primary die and patch die have a plurality of bond pads. The dice are attached such that the bond pads of each face in a common direction. A substrate with leads or a plurality of lead fingers from a leadframe extend toward the primary die (the term “substrate” will be used for purposes of this application to mean either a substrate carrying traces or other conductors or a leadframe). The substrate conductors may make electrical contact with the bond pads on the patch die or primary die. Generally, the electrical contact is made with a plurality of bond wires. However, the electrical contact could be made with TAB connections, lead fingers in a leads-over-hip (LOC) or even a leads-between-chip (LBC) connection configuration or the like. A second electrical connection is made between the patch die and the primary die. The second electrical connection can likewise be made with bond wires or TAB connections. However, the second electrical connection can also comprise a lower bond pad (actually a via) disposed on the adhesion surface or back side of the patch die. A flip chip electrical connect, such as solder or a conductive polymer, achieves an electrical connection between the lower patch die bond pad or via end, and the primary die bond pad. 
     The patch die may receive an output signal from the primary die, or receive an input signal from or provide an output signal to the substrate trace or leadframe. The circuitry in the patch die remediates, modifies, adapts or performs upgrade functions and outputs the corrected or modified signal to the primary die or a substrate conductor or lead finger (depending on the input). 
     A glob top or dammed encapsulant may be applied over the entire assembly to protect same from contamination and physical damage. After application of the glob top or other encapsulant, the primary die, for all intents and purposes, is indistinguishable, both physically and in performance, from a die designed from the outset to exhibit the modified and desired characteristics of the assembly. 
     Another embodiment comprises a patch die which may span the width and/or length of the primary die. In this embodiment, the patch die has a plurality of first bond pads on a patch die face surface, preferably in the approximate position of the primary die bond pads. The patch die further includes a plurality of lower bond pads (via ends) on a patch die back side. A flip chip type electrical connect, such as solder, a conductive polymer or a conductor-loaded polymer, achieves an electrical connection between the lower bond pads and the primary die bond pads. The substrate conductors or lead fingers extend toward the primary die and are connected to their respective bond pads on a face surface of the patch die with a plurality of bond wires. The remediation, adaptation, modification or upgrade is achieved with the patch die. As previously discussed, the patch die either receives an output signal from the original die or an input signal from the substrate or lead finger. The circuitry in the patch die remediates, adapts, modifies or performs upgrade functions and outputs the corrected signal to the original die or the substrate lead or lead finger (depending on the input). 
     Yet another embodiment of the present invention comprises the use of multiple interacting patch dice either separately attached to the original die or stacked atop one another. Multiple patch die assemblies are necessary when a single chip cannot by itself provide all of the circuitry required for remediation or where the amount of real estate on a primary die will not allow for a single large patch die. 
     In the multiple stacked assembly, a lower patch die is attached to the original die with a first layer of adhesive. A back surface of an upper patch die is attached to a face surface of the lower patch die with a second layer of adhesive. A plurality of bond wires makes electrical contact between the substrate leads or lead fingers and a plurality of bond pads on an upper patch die face surface of at least one of the patch dice. A plurality of upper-to-lower patch die bond wires makes electrical contact between a plurality of bond pads on the upper patch die face surface and a plurality of respective die bond pads on the lower patch die face surface. A plurality of stack-to-primary die bond wires makes electrical contact between a plurality of bond pads of at least one of the patch dice and a plurality of primary die bond pads. 
     In the separately attached multiple die assembly, multiple patch dice are each attached directly atop the original die. The patch dice electrically interact with one another, as well as the primary die, and in connection with the substrate or leadframe in the manner discussed above to achieve remediation of the original die. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     While the specification concludes with claims particularly pointing out and distinctly claiming that which is regarded as the present invention, the advantages of this invention can be more readily ascertained from the following description of the invention when read in conjunction with the accompanying drawings in which: 
     FIG. 1 is a top plan view of a prior art wire bond/leadframe semiconductor assembly; 
     FIG. 2 is a top plan view of a prior art leads over chip semiconductor assembly; 
     FIG. 3 is a top plan view of a preferred assembly of the present invention; 
     FIG. 4 is a side cross-sectional view of the assembly of FIG. 3 along line  4 — 4 ; 
     FIG. 5 is a side cross-sectional view of an alternate assembly; 
     FIG. 6 is a side cross-sectional view of another alternate assembly; 
     FIG. 7 is a top plan view of another preferred assembly of the present invention; 
     FIG. 8 is a side cross-sectional view of the assembly of FIG. 7 along line  8 — 8 ; 
     FIG. 9 is a side plan view of yet another alternate assembly of the present invention; 
     FIG. 10 is a side plan view of a multiple patch die assembly of the present invention; 
     FIG. 11 is a side plan view of an alternative multiple patch die assembly of the present invention; and 
     FIG. 12 is a top plan view of yet another alternative multiple patch die assembly of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 illustrates a prior art wirebonded bare die assembly  100 . The assembly  100  comprises a semiconductor die  102  having a plurality of bond pads  104  on an upper surface  106  of the semiconductor die  102 . The semiconductor die  102  is conventionally mounted by its back side (not shown) on a leadframe paddle  108  of leadframe  110 . The leadframe  110  further includes a plurality of lead fingers  112  which extend toward the semiconductor die  102 . The semiconductor die  102  achieves an electrical connection with the leadframe  110  with a plurality of bond wires  114  connected between each bond pad  104  and its respective lead finger  112 . 
     FIG. 2 illustrates a prior art leads-over-chip (LOC) bare die assembly  200 . The assembly  200  comprises a semiconductor die  202  having a plurality of bond pads  204  (shown in shadow lines) on an upper surface  206  of the semiconductor die  202 . The semiconductor die  202  is electrically connected to a leadframe  208  though a plurality of lead fingers  210 , each of which extends over the die upper surface  206  to either directly electrically contact and attach to its respective bond pad  204  (as with thermocompression bonding) or through bond wires if lead fingers  210  terminate short of bond pads  204 . The former approach is illustrated. 
     FIG. 3 illustrates a bare die assembly  300  of the present invention. The assembly  300  comprises a patch die  302  atop a primary die  304 . A plurality of leads from a substrate (not shown) or a plurality of lead fingers  306  from a leadframe (remainder not shown) extends toward the primary die  304  and is individually attached to its respective bond pads  308  on a face surface  310  of the primary die  304  with a plurality of bond wires  312 . The remediation, adaptation, modification or upgrade is achieved with the patch die  302 . 
     FIG. 4 illustrates the mechanical and electrical attachment of the patch die  302  in a cross-sectional view along line  4 — 4  of FIG.  3 . Components common to both FIGS. 3 and 4 retain the same numeric designation. The patch die  302  is attached to the primary die  304  with a layer of adhesive  315  disposed between a patch die back side  326  and primary die face surface  310 . At least one first patch bond wire  314  makes electrical contact between at least one appropriate substrate lead or lead finger  306  and at least one first patch bond pad  316  on patch die face surface  328 . At least one second patch bond wire  318  makes electrical contact between at least one second patch bond pad  320  on the patch die face surface  328  and at least one respective primary die bond pad  308 . Thus, the patch die  302  either receives an output signal from the primary die  304  and outputs to one or more lead fingers  306 , or receives an input signal from the substrate or lead finger  306  and outputs to primary die  304 . The circuitry in the patch die  302  remediates, adapts, modifies or performs upgrade functions and outputs the corrected signal to the primary die  304  or the substrate lead or lead finger  306  (depending on the input). It is also possible and contemplated as within the scope of the invention, that patch die  302  receives an input from, and in turn outputs to, primary die  304 . FIG. 4 differs from FIG. 3 in the fact that element  306  is shown as a substrate (rather than a lead finger) with a substrate trace  322  to which the first patch bond wire  314  is connected. 
     A glob top  324  or other encapsulating structure may be applied over the assembly  300  individually, as shown in broken lines, or over the entire substrate (remainder not shown), which may support a plurality of assemblies  300 . The subsequently described embodiments may similarly be glob-topped, as desired. 
     FIG. 5 illustrates an alternative connection assembly  500  for the patch die  302 . The assembly  500  of FIG. 5 is similar to the assembly  300  of FIG. 4; to a therefore, components common to both FIGS. 4 and 5 retain the same numeric designation. FIG. 5 differs from FIG. 4 only in the electrical attachment of the patch die  302 . FIG. 5 illustrates a TAB connection  502  for electrical communication between the substrate trace  322  and the first patch bond pad  316  on the patch die face surface  328  and a TAB connection  504  between the second patch bond pad  320  on the patch die face surface  328  and the primary die bond pad  308 . It is, of course, understood that a combination of bond wires and TAB connections could be used to make the required electrical connections. 
     FIG. 6 illustrates another alternative connection assembly  600  of the patch die  302 . The assembly  600  of FIG. 6 is similar to the assembly  300  of FIG. 4, to therefore, components common to both FIGS. 4 and 6 retain the same numeric designation. FIG. 6 differs from FIG. 4 only in the electrical attachment of the patch die  302 . FIG. 6 illustrates an LOC thermocompression connection of lead finger  602  of leadframe  604  which extends over, is attached to, and makes electrical contact with the first patch bond pad  316  on the patch die face surface  328  (similar to prior art FIG.  2 ). The second patch bond wire  318  achieves electrical communication between the second patch bond pad  320  on the patch die face surface  328  and the primary die bond pad  308 . It is, of course, understood that a TAB connection could be used to make the electrical connections between the second patch bond pad  320  and the primary die bond pad  308 . 
     FIG. 7 illustrates another bare die assembly  700  of the present invention. The assembly  700  of FIG. 7 is similar to the assembly  300  of FIG. 3, therefore, components common to both FIGS. 3 and 7 retain the same numeric designation. The assembly  700  comprises the patch die  302  atop the primary die  304 . The substrate with leads (not shown) or the plurality of lead fingers  306  from the leadframe (remainder not shown) extends toward the primary die  304  and is attached to its respective bond pads  308  on the face surface  310  of the primary die  304  with the plurality of bond wires  312  (similar to the configuration shown in prior art FIG.  1 ). The remediation, adaptation, modification or upgrade is achieved with the patch die  302 . 
     FIG. 8 illustrates the electrical connection of the patch die  302  to primary die  304  in a cross-sectional view along line  8 — 8  of FIG.  7 . Components common to both FIGS. 7 and 8 retain the same numeric designation. The patch die  302  is attached to the primary die  304  with a layer of adhesive  315 . At least one first patch bond wire  314  makes electrical contact between at least one appropriate substrate lead or lead finger  306  and at least one first patch bond pad  316  of the patch die  302 . A lower bond pad or via base  702  is disposed on the patch die back side  326 . An electrical connect  704 , such as solder or a conductive polymer, achieves an electrical connection between the lower bond pad or via base  702  and the primary die bond pad  308 . 
     As previously discussed, the patch die  302  may receive an output signal from the primary die  304  or an input signal from the substrate or lead finger  306  or both. The circuitry in the patch die  302  remediates, adapts, modifies or performs upgrade functions and outputs the corrected signal to the primary die  304  or the substrate lead or lead finger  306  (depending on the input). FIG. 8 differs from FIG. 7 in the fact that the component  306  is shown as a substrate (rather than a lead finger) with the substrate trace  322  to which the first patch bond wire  314  is connected. 
     FIG. 9 illustrates a side plan view of yet another alternate bare die assembly  900  of the present invention. The assembly  900  of FIG. 9 is similar to the assembly  300  of FIG. 4; therefore, components common to both FIGS. 4 and 9 retain the same numeric designation. The assembly  900  comprises the patch die  302  atop the primary die  304 . In this embodiment, the patch die  302  spans the width of the primary die  304 . The patch die  302  has the first patch bond pads  316  disposed on the patch die face surface  328 , preferably in the approximate position of the primary die bond pads  308 . The patch die  302  further includes a plurality of lower bond pads or via bases  902  disposed on the patch die back side  326 . Electrical connects  904 , such as solder or a conductive polymer, achieve electrical connections between the lower bond pads  902  and the primary die bond pads  308 . 
     The substrate carrying conductors or a leadframe with lead fingers  306  extends toward the primary die  304 . The conductors (lead fingers  306  or substrate traces  322 ) are attached to their respective first patch bond pads  316  on the face surface  328  of the patch die  302  with the plurality of first patch bond wires  314 . The remediation, adaptation, modification or upgrade is achieved with the patch die  302 . As previously, the patch die  302  may receive an output signal from the primary die  304 , an input signal from the substrate or lead finger  306  or both. The circuitry in the patch die  302  remediates, adapts, modifies or performs upgrade functions and outputs the corrected signal to the primary die  304  or the substrate lead or lead finger  306  (depending on the input). 
     FIG. 10 illustrate a side plan view of a multiple stacked bare die assembly  1000  of the present invention. The assembly  1000  of FIG. 10 is similar to the assembly  300  of FIG. 4; therefore, components common to both FIGS. 4 and 10 retain the same numeric designation. The assembly  1000  comprises a lower patch die  1002  atop the primary die  304 . The lower patch die  1002  is attached to the primary die  304  with a first layer of adhesive  1004  disposed between a lower patch die back side  1006  and the primary die face surface  310 . A back surface  1012  of an upper patch die  1008  is attached to a face surface  1010  of the lower patch die  1002  with a second layer of adhesive  1014 . 
     At least one substrate-to-upper patch die bond wire  1016  makes electrical contact between at least one appropriate substrate lead or lead finger  306  and at least one first upper die bond pad  1018  on an upper patch die face surface  1020 . At least one upper-to-lower die bond wire  1022  makes electrical contact between at least one second upper die bond pad  1024  on the upper patch die face surface  1020  and at least one respective first lower die bond pad  1026  on the lower patch die face surface  1010 . At least one lower-to-primary die bond wire  1028  makes electrical contact between at least one second lower bond pad  1030  and at least one primary die bond pad  308 . 
     Thus, the lower patch die  1002  receives an input signal from the primary die  304  which is initially remediated. The initially remediated signal is sent to the upper patch die  1008  wherein a second stage of remediation is done before outputting the corrected signal to the substrate or lead finger  306 . Alternatively, the upper patch die  1008  receives an input signal from the substrate or lead finger  306  which is initially remediated and the initially remediated signal is sent to the lower patch die  1002  wherein a second remediation is done before outputting the corrected signal to the primary die  304 . 
     FIG. 11 illustrates a side plan view of a multiple bare die assembly  1100  of the present invention. The assembly  1100  of FIG. 11 is similar to the assembly  300  of FIG. 4; therefore, components common to both FIGS. 4 and 11 retain the same numeric designation. The assembly  1100  comprises a first patch die  1102  and a second patch die  1104  both atop the primary die  304 . The first patch die  1102  is attached to the primary die  304  with a first layer of adhesive  1106  disposed between a first patch die back side  1108  and the primary die face surface  310 . The second patch die  1104  is also attached to the primary die  304  with a second layer of adhesive  1110  disposed between a second patch die back side  1112  and primary die face surface  310 . 
     At least one substrate-to-first patch die bond wire  1114  makes electrical contact between at least one appropriate substrate lead or lead finger  306  and at least one first patch die first bond pad  1116  on a first patch die face surface  1118 . At least one first-to-second die bond wire  1120  makes electrical contact between at least one first patch die second bond pad  1122  on the first patch die face surface  1118  and at least one respective second patch die first bond pad  1124  on the second patch die face surface  1125 . At least one second patch die-to-primary die bond wire  1126  makes electrical contact between at least one second patch die second bond pad  1128  and at least one primary die bond pad  308 . 
     Thus, the second patch die  1104  receives an input signal from the primary die  304  which is initially remediated and the initially remediated signal is sent to the first patch die  1102  wherein a second remediation is done before outputting the corrected signal to the substrate or lead finger  306 . Alternately, the first patch die  1102  receives an input signal from the substrate or lead finger  306 , which signal is initially remediated, and the initially remediated signal is sent to the second patch die  1104  wherein the second remediation is done before outputting the corrected signal to the primary die  304 . 
     FIG. 12 depicts a previously referenced but unillustrated embodiment  1200  of the invention, wherein a first patch die  1202  interacts solely with primary die  304 , while a second patch die  1204  serves as an intermediary between primary die  304  and certain conductors (e.g., lead fingers  306 ). Reference numerals employed in FIG. 12 correspond to those previously employed in FIGS. 3, and  4  to identify similar elements. Exemplary bond wires are identified as  1210 , and bond pads of patch dice as  1212 . Of course, multiple stacked patch dice could also be employed on primary die  304  so that three, four or even more additional dice, might be mounted to primary die  304 , as required. Further, two or more stacked or co-planar patch die  1206 ,  1208  might only communicate with the primary die and not with external circuitry. 
     It is, of course, understood that a multitude of die configurations can be devised using the teachings this disclosure. 
     Having thus described in detail preferred embodiments of the present invention, it is to be understood that the invention defined by the appended claims is not to be limited by particular details set forth in the above description, as many apparent variations thereof are possible without departing from the spirit or scope thereof.