Patent Document

BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an apparatus for providing a single chip package minimizing Radio Frequency (RF) performance deterioration by reducing parasitic inductance occurring in the package as well as achieving low costs and miniaturization when mass-producing a product. 
         [0003]    2. Description of the Related Art 
         [0004]    A conventional single chip package couples a substrate of an RF band with a Printed Circuit Board (PCB) via a Ball Grid Array (BGA) technology that uses a ball having a height of about 0.6˜1 mm to form a single chip package. 
         [0005]    This single chip package requires additional external processes such as ball forming, ball attaching, ball molding, etc. in an aspect of production. In addition, for maintaining the size of a ball and a predetermined interval, a package size increases and an attached ball may be detached, so that the single chip package has disadvantage in shipment and handling. 
         [0006]    Also, in an RF band circuit of the single chip package, inductance generated from a ball for power supply and a ground generates performance deterioration and characteristic change such as gain reduction and frequency movement in an aspect of performance, and the ground should pass through a ball, so that the single chip package has a difficulty in radiation of heat. 
       SUMMARY OF THE INVENTION 
       [0007]    An aspect of the present invention is to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention is to provide an apparatus for a single chip package using Land Grid Array (LGA) coupling. 
         [0008]    Another aspect of the present invention is to provide an apparatus for a single chip package wherein a path for power supply and a ground is short, and a signal is transmitted in a coaxial shape or in a Co-Planar Waveguide guide (CPW) shape, so that parasitic inductance is minimized and performance of an RF chip does not deteriorate and a characteristic does not change. 
         [0009]    Still another aspect of the present invention is to provide an apparatus for an RF single chip package having excellent performance in heat radiation since a multi-layer substrate and a mainboard are directly connected via a pad. 
         [0010]    In accordance with an aspect of the present invention, an apparatus for a single chip package using Land Grid Array (LGA) coupling is provided. The apparatus includes a multi-layer substrate having at least one substrate layer, having at least one first chip region and at least one second chip region in a lowermost substrate layer, configuring a transmission line transition of a vertical structure for transmitting a signal from at least one integrated circuit chip coupled in the first chip region in a coaxial shape or in a Co-Planar Waveguide guide (CPW) shape, and having an LGA coupling pad for connecting with a Printed Circuit Board (PCB) in the lowermost layer, the at least one integrated circuit chip coupled in the first chip region and the second chip region, and the PCB connected with the multi-layer substrate using the LGA coupling via the LGA coupling pad. 
         [0011]    In accordance with another aspect of the present invention, an apparatus for a single chip package using Land Grid Array (LGA) coupling is provided. The apparatus includes a multi-layer substrate having at least one substrate layer, having at least one chip region in a lowermost substrate layer, configuring a transmission line transition of a vertical structure for transmitting a signal from at least one integrated circuit chip coupled in the chip region in a coaxial shape or in a Co-Planar Waveguide guide (CPW) shape, and having an LGA coupling pad for connecting with a Printed Circuit Board (PCB) in the lowermost layer, the at least one integrated circuit chip coupled in the chip region, and the PCB connected with the multi-layer substrate using the LGA coupling via the LGA coupling pad. 
         [0012]    Other aspects, advantages and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The above and other aspects, features and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which: 
           [0014]      FIG. 1  is a view illustrating a single chip package using LGA coupling according to an embodiment of the present invention; 
           [0015]      FIG. 2  is a view illustrating a multi-layer substrate before SMT according to an embodiment of the present invention; 
           [0016]      FIG. 3  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to an embodiment of the present invention; 
           [0017]      FIG. 4  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to another embodiment of the present invention; 
           [0018]      FIG. 5  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to further another embodiment of the present invention; 
           [0019]      FIG. 6  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still another embodiment of the present invention; 
           [0020]      FIG. 7  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet another embodiment of the present invention; 
           [0021]      FIG. 8  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still another embodiment of the present invention; 
           [0022]      FIG. 9  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet further another embodiment of the present invention; 
           [0023]      FIG. 10  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still yet another embodiment of the present invention; 
           [0024]      FIG. 11  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still yet further another embodiment of the present invention; 
           [0025]      FIG. 12  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still another embodiment of the present invention; 
           [0026]      FIG. 13  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still further another embodiment of the present invention; and 
           [0027]      FIG. 14  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet another embodiment of the present invention. 
       
    
    
       [0028]    Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. 
       DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0029]    The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness. 
         [0030]    The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
         [0031]    Exemplary embodiments of the present invention provide an apparatus for a single chip package using LGA coupling. 
         [0032]    The present invention provides an apparatus for a single chip package using LGA coupling wherein the package has a short path for power supply and a ground, and transmits a signal in a coaxial shape or in a Co-Planar Waveguide guide (CPW) shape, so that parasitic inductance is minimized and performance of an RF chip does not deteriorate and a characteristic does not change as well as it enables low costs and miniaturization when mass-producing a product. 
         [0033]    Particularly, the present invention is very useful for a millimeter wave band and may be used for implementing a system for a multi-frequency application in a system-on-package (SoP) such as a case where a millimeter wave band system is integrated in an integrated system of 2/5 GHz bands. 
         [0034]    An apparatus of the present invention couples a multi-layer substrate with a mainboard using a coupling pad for LGA coupling, and may mount one or a plurality of integrated circuit chips thereon. 
         [0035]    In the present invention, a multi-layer substrate mounting an RF (millimeter wave) band antenna or transition between an integrated circuit chip and an antenna therein has an interconnection contact pad for LGA coupling with a mainboard, so that the multi-layer substrate may be connected via simple soldering without an additional process. 
         [0036]    In the present invention, a chip is connected with the multi-layer substrate via a flip-chip bump or a wire, and in case of an RF chip, GND vias are positioned in the neighborhood of a signal line bump, so that they play a role of a low loss transmission line such as a coaxial shape or a Co-Planar Waveguide guide (CPW). 
         [0037]    The mainboard forms a cavity to provide a concave portion so that a chip attached on the multi-layer substrate may not bump into the mainboard. In addition, the mainboard may include an input end connected with a low frequency band antenna. In addition, the mainboard is used in the same meaning as a PCB in the present invention. 
         [0038]      FIG. 1  illustrates a single chip package using LGA coupling according to an embodiment of the present invention. 
         [0039]    Referring to  FIG. 1 , a signal, GND, and power of a chip 1  120  may be connected with a multi-layer substrate  110  via flip-chip bonding (step A). 
         [0040]    An RF signal is enclosed by two or more GND vias to maintain a coaxial cable shape or a CPW shape (step B). 
         [0041]    A transition that can connect with an antenna or an external antenna is positioned in the uppermost layer of the multi-layer substrate  110  (step C). 
         [0042]    In the multi-layer structure of the multi-layer substrate  110 , power, GND, digital/IF signal, etc. may be connected with the mainboard  150  (step D). 
         [0043]    Chips 1, 2  120  and  130  are positioned in cavities in the mainboard  150  (step E). 
         [0044]    Connection ends such as signal, GND, power of the chip 2  130  may be connected with the multi-layer substrate  110  via wire bonding (step F). 
         [0045]    The chip 2  130  may be connected with GND mounted inside the multi-layer substrate  110  through a via of the multi-layer substrate  110  (step G). 
         [0046]    Ends such as power, GND, digital/IF signal, etc. of the chip 2  130  may be connected with the mainboard  150  (step H). 
         [0047]    In the above single chip structure, a structure where the chip 1  120  and the multi-layer structure  110  are connected may be more suitably used for an RF region. In addition, a structure where the chip 2  130  and the multi-layer structure  110  are connected may be used for a low frequency region. 
         [0048]    This is because the structure where the chip 1  120  and the multi-layer structure  110  are connected shows low performance deterioration for the RF region and even the low frequency region, and the structure where the chip 2  130  and the multi-layer structure  110  are connected shows relatively high performance deterioration for the RF region but shows low performance deterioration for the low frequency region. 
         [0049]      FIG. 2  illustrates a multi-layer substrate before SMT according to an embodiment of the present invention. 
         [0050]    Referring to  FIG. 2 , a multi-layer substrate  210  before SMT is illustrated. The multi-layer substrate  210  includes a chip 1  220  and a chip 2  230  as an embodiment, but the number of chips is not limited in implementation. 
         [0051]    As described above, the chip 2  230  may be connected with a signal pad  235  via the multi-layer substrate  210  and wire bonding. 
         [0052]    In the chip 1  220 , as an embodiment, two signal vias  227  are illustrated. The signal via  227  is enclosed by GNG vias  225 , and the GNG vias  225  are enclosed by metal. 
         [0053]    The number of GND vias  225  enclosing the signal via  227  is two or more per one signal via, and a maximum number of GND vias is not limited. The signal via  227  and the GND via  225  have a coaxial shape or a CPW shape, and have an advantage that performance deterioration is low in the RF region. 
         [0054]    For connection using LGA coupling, an LGA interconnection contact pad  237  may be used for digital/IF signal, power, GND, control signal transmission of the chips 1, 2  220  and  230 , and as described above, it may be used for coupling with the mainboard. 
         [0055]    In an embodiment which will be described below, how the chip 2 is connected with the multi-layer substrate or the mainboard between the multi-layer substrate and the mainboard, and how a cavity is formed between the multi-layer substrate and the mainboard, and whether a heat sink is attached to the mainboard are described. 
         [0056]      FIG. 3  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to an embodiment of the present invention. 
         [0057]    Referring to  FIG. 3 , a chip 2  330  is connected to the multi-layer substrate  310  using flip-chip bonding between the multi-layer substrate  310  and the mainboard  350 . In  FIG. 3 , a cavity is positioned in the mainboard  350 . 
         [0058]      FIG. 4  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to another embodiment of the present invention. 
         [0059]    Referring to  FIG. 4 , a chip 2  430  is connected to the mainboard  450  using flip-chip bonding between the multi-layer substrate  410  and the mainboard  450 . In this case, a cavity is positioned in the mainboard. 
         [0060]      FIG. 5  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to further another embodiment of the present invention. 
         [0061]    Referring to  FIG. 5 , a chip 2  530  is connected to the mainboard  550  using wire bonding between the multi-layer substrate  510  and the mainboard  550 . In this case, a cavity is positioned in the mainboard  550 . 
         [0062]      FIG. 6  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still another embodiment of the present invention. 
         [0063]    Referring to  FIG. 6 , a chip 2  630  is connected to the multi-layer substrate  610  using flip-chip bonding between the multi-layer substrate and the mainboard  650 . In this case, a cavity is positioned in the multi-layer substrate  610 . 
         [0064]      FIG. 7  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet another embodiment of the present invention. 
         [0065]    Referring to  FIG. 7 , a chip 2  730  is connected to the multi-layer substrate  710  using wire bonding between the multi-layer substrate  710  and the mainboard  750 . In this case, a cavity is positioned in the multi-layer substrate  710 . 
         [0066]      FIG. 8  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still another embodiment of the present invention. 
         [0067]    Referring to  FIG. 8 , a chip 2  830  is connected to the mainboard  850  using flip-chip bonding between the multi-layer substrate  810  and the mainboard  850 . In this case, a cavity is positioned in the multi-layer substrate  810 . 
         [0068]      FIG. 9  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet further another embodiment of the present invention. 
         [0069]    Referring to  FIG. 9 , a chip 2  930  is connected to the mainboard  950  using wire bonding between the multi-layer substrate  910  and the mainboard  950 . In this case, a cavity is positioned in the multi-layer substrate  910 . 
         [0070]      FIG. 10  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still yet another embodiment of the present invention. 
         [0071]    Referring to  FIG. 10 , a chip 2  1030  is connected to the multi-layer substrate  1010  using flip-chip bonding between the multi-layer substrate  1010  and the mainboard  1050 . In this case, a cavity is positioned in the multi-layer substrate  1010  and the mainboard  1050  together. 
         [0072]      FIG. 11  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to still yet further another embodiment of the present invention. 
         [0073]    Referring to  FIG. 11 , a chip 2  1130  is connected to the multi-layer substrate  1110  using wire bonding between the multi-layer substrate  1110  and the mainboard  1150 . In this case, a cavity is positioned in the multi-layer substrate  1110  and the mainboard  1150  together. 
         [0074]      FIG. 12  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still another embodiment of the present invention. 
         [0075]    Referring to  FIG. 12 , a chip 2  1230  is connected to the mainboard  1250  using flip-chip bonding between the multi-layer substrate  1210  and the mainboard  1250 . In this case, a cavity is positioned in the multi-layer substrate  1210  and the mainboard  1250  together. 
         [0076]      FIG. 13  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet still further another embodiment of the present invention. 
         [0077]    Referring to  FIG. 13 , a chip 2  1330  is connected to the mainboard  1350  using wire bonding between the multi-layer substrate  1310  and the mainboard  1350 . In this case, a cavity is positioned in the multi-layer substrate  1310  and the mainboard  1350  together. 
         [0078]      FIG. 14  is a view illustrating a connection structure of a mainboard and a multi-layer substrate according to yet another embodiment of the present invention. 
         [0079]    Referring to  FIG. 14 , a chip 2  1430  is connected to the multi-layer substrate  1410  using wire bonding between the multi-layer substrate  1410  and the mainboard  1450 . In this case, a cavity is positioned in the mainboard  1450 . 
         [0080]    In addition, a heat sink  1460  is attached to the mainboard  1450  to help heat emission of the mainboard  1450 . The heat sink  1460  may be attached to all mainboards of  FIGS. 3 to 13  to help heat emission. 
         [0081]    Since the present invention does not require an additional process, it is advantageous in cost reduction, mass production, and miniaturization. Also, according to the present invention, since a power and GND path is short, parasitic inductance is small, so that an RF system performance is stable and it has an advantage in heat radiation and so the present invention is very advantageously applied to a portable terminal. Also, small-sized single integrated packaging of a millimeter wave band system or an integrated system of the millimeter wave band and a 2/5 GHz band is possible. 
         [0082]    Although the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Therefore, the scope of the present invention should not be limited to the above-described embodiments but should be determined by not only the appended claims but also the equivalents thereof.

Technology Category: 5