Patent Publication Number: US-2023144129-A1

Title: Semiconductor chiplet device

Description:
CROSS - REFERENCE TO RELATED APPLICATION 
     This application claims priority to Taiwan Application Serial Number 110141887, filed Nov. 10, 2021, which is herein incorporated by reference in its entirety. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a semiconductor chiplet device, especially a structure in which multiple dies are connected through an interposer layer. 
     Description of Related Art 
     With the development of High Performance Computing (HPC) and Artificial Intelligence (Al) technologies, the requirements for 3D chips and chiplet technologies is increasing. “Die-to-Die” is one of the important technologies for semiconductor chip packaging, which can package System On Chip with multiple small modules to form a multi-chip module. 
     SUMMARY 
     One aspect of the present disclosure is a semiconductor chiplet device, comprising a first die, a second die, an interposer layer and a package substrate. The first die comprises a first interface. The second die comprises a second interface. A first side of the interposer layer is configured to set the first die and the second die. The first die and the second die are configured to perform a data transmission through the first interface, the interposer layer and the second interface. The package substrate is arranged on a second side of the interposer layer, and comprises at least one decoupling capacitor. The decoupling capacitor is arranged between the the first interface and the second interface, or is arranged in a vertical projection area of the first interface and the second interface on the packaging substrate. 
     Another aspect of the present disclosure is a semiconductor chiplet device, comprising a first die, a second die, an interposer layer and a package substrate. The first die comprises a first interface. The second die comprises a second interface. A first side of the interposer layer is configured to set the first die and the second die. The first die and the second die are configured to perform a data transmission through the first interface, the interposer layer and the second interface. The package substrate is arranged on a second side of the interposer layer. The interposer layer comprises at least one decoupling capacitor, the decoupling capacitor is arranged between the the first interface and the second interface, or is arranged in a vertical projection area of the first interface and the second interface on the interposer layer. 
     It is to be understood that both the foregoing general description and the following detailed description are by examples, and are intended to provide further explanation of the disclosure as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
         FIG.  1    is a schematic diagram of a semiconductor chiplet device in some embodiments of the present disclosure. 
         FIG.  2    is a partial structure schematic diagram of a semiconductor chiplet device in some embodiments of the present disclosure. 
         FIG.  3    is a schematic diagram of the vertical projection area and the decoupling capacitor in some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     For the embodiment below is described in detail with the accompanying drawings, embodiments are not provided to limit the scope of the present disclosure. Moreover, the operation of the described structure is not for limiting the order of implementation. Any device with equivalent functions that is produced from a structure formed by a recombination of elements is all covered by the scope of the present disclosure. Drawings are for the purpose of illustration only, and not plotted in accordance with the original size. 
     It will be understood that when an element is referred to as being “connected to” or “coupled to”, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element to another element is referred to as being “directly connected” or “directly coupled,” there are no intervening elements present. As used herein, the term “and / or” includes an associated listed items or any and all combinations of more. 
       FIG.  1    is a schematic diagram of a semiconductor chiplet device in some embodiments of the present disclosure. The semiconductor chiplet device  100  includes a first die D 10  and at least one second die D 20 . In one embodiment, the first die D 10  may be a main Die or a System on a Chip. The second die D 20  may be a chiplet, or another slave die in the dual-main chip structure. The first die D 10  includes a first interface D 11 , and the second die D 20  includes a second interface D 21 . The the first interface D 11  and the second interface D 21  is configured to perform a data transmission between the first die D 10  and the second die D 20 , to form a package interconnection transmission network between semiconductor chips. 
     The above the first interface D 11  and second interface D 21  may be implemented by a l/Ointerface circuit in the die(Transmitter/Receiver interface, Transmitter/Receiver interface phy). As shown in  FIG.  1   , each die has multiple connection interfaces, but in other embodiments, the die can also be connected to other dies through only one connection interface. The present disclosure provides a decoupling area  300  between the two interfaces D 11  and D 21 , or in the vertical projection area of the two interfaces D 11  and D 21 . By the decoupling capacitor of the decoupling area  300 , the power integrity of the die and the quality of the transmission signal are improved. 
       FIG.  2    is a partial structure schematic diagram of a semiconductor chiplet device  100  in some embodiments of the present disclosure, which corresponds to a section line A-A′ of the semiconductor chiplet device  100  in  FIG.  1   . For clarity,  FIG.  2    omits the parts of the first die D 10  except the the first interface D 11 , and omits the parts of the second die D 20  except the second interface D 2 . 
     As shown in  FIG.  2   , the semiconductor chiplet device  100  is arranged on the circuit board  110 , include a package substrate  120 , an interposer layer  130  a first die D 10  and a second die D 20 . The circuit board  110  is electrically connected to a first power node Vdd and a second power node Vss (e.g., ground). The first power node Vdd is configured to provide a driving voltage to the semiconductor chiplet device  100 , so as to drive electronic components in the first die D 10  and the second die D 20 . In particular, the first power node Vdd and the second power node Vss is configured to refer to nodes connected to a specific potential. 
     In one embodiment, the package substrate  120  through multiple bumps BP 1 , BP 2  connected to the circuit board  110  by thin film process, electroless plating process technology, electroplating or printing technology, so as to electrically connect to the first power node Vdd and the second power node Vss through the circuit board  110 . 
     The first side(the upper side as shown in  FIG.  2   ) of the interposer layer  130  is configured to set the first die D 10  and the second die D 20 . The second side (the bottom side as shown in  FIG.  2   ) of the interposer layer  130  is configured to set the package substrate  120 , and is electrically connected to the package substrate  120 . The interposer layer  130  can also be connected to the package substrate  120 , the first die D 10  and the second die D 20  through multiple bumps BP 3 . 
     The first die D 10  and the second die D 20  is electrically connected to the first power node Vdd through the interposer layer  130 , the package substrate  120  and the circuit board  110 , so as to receive the driving voltage. 
     Specifically, the material of the interposer layer  130  can be a silicon interposer, which is provided with multiple layers of wires. The wires are configured to connect the electronic signals between the dies, and can be connected to external bumps by a through silicon vias (TSV) and a wire carrier, so that the dies are tightly connected to the package substrate. 
     The semiconductor chiplet device  100  further includes at least one decoupling capacitor Cd. The decoupling capacitor Cd is arranged on the interposer layer  130  or the package substrate  120 , and the position of the decoupling capacitor Cd corresponds to the setting positions of the the first interface D 11  and the second interface D 21 . The the first interface D 11  and the second interface D 21  are electrically connected to the second power node Vss through the decoupling capacitor Cd, so as to form a discharge path configured to eliminate noise (i.e., the first die D 1  and the second die D 2  form at least one discharge path with the decoupling capacitor Cd). As shown in  FIG.  2    , the positions of the decoupling capacitor Cd corresponds to a position between vertical projection areas of the the first interface D 11  and the second interface D 21 . In some other embodiments, the positions of the decoupling capacitor Cd can also be located at the vertical projection area of the the first interface D 11 , the second interface D 21  , or be located bwteen the first die D 10  the second die D 20 . “The vertical projection area” refers to the area where the first interface D 11  and the second interface D 21  are projected onto the package substrate  120  or the interposer layer  130 . 
     Accordingly, during the semiconductor chiplet device  100  is operating, if noise is generated on the first die D 10  or the second die D 20 , the noise will be conducted to the second power node Vss through the decoupling capacitor Cd without affecting other dies or other components of the circuit board  110 . By using the decoupling capacitor Cd to eliminate noise, the power supply voltage can be prevented from being interfered and reduce beyond the normal range, and the power integrity optimization of the semiconductor chiplet device  100  can be ensured. 
     In addition, since the decoupling capacitor Cd is located between the the first interface D 11  and the second interface D 21 , or is located in the projection area of the the first interface D 11  and the second interface D 21 , instead of being located at a position farther away from the same horizontal plane as the first die D 1 /the second die D 21  (i.e., the distance is shorter), the effect of the decoupling capacitor Cd can be ensured. 
     In one embodiment, the decoupling capacitor Cd is arranged on the package substrate  120 . As shown in  FIG.  2   , the decoupling capacitor Cd is arranged between the package substrate  120  and the circuit board  110  (i.e., a side of the package substrate  120  facing the circuit board  110 ). However, the present disclosure is not limited to this, the decoupling capacitor Cd can also be arranged between the package substrate  120  and the interposer layer  130  (e.g., a side of the package substrate  120  facing the interposer layer  130 ). 
     As shown in  FIG.  2   , in some other embodiments, the decoupling capacitor Cd is arranged on the interposer layer  130 , and is arranged between the interposer layer  130  and the package substrate  120 . In other words, the decoupling capacitor Cd is arranged on a side of the interposer layer  130  facing the package substrate  120 ), such as setting between the bump BP 1  and the bump BP 2 . In some other embodiments, the decoupling capacitor Cd can also be arranged on a first side of the interposer layer  130 , which is located between the first die D 10  and the second die D 20 . 
     In some embodiments, the number of the decoupling capacitor Cd can be adjusted. For example, the semiconductor chiplet device  100  can provide one decoupling capacitor Cd under the space between the first interface D 11  and the second interface D 21 , or the semiconductor chiplet device  100  can also provide a decoupling capacitor Cd under the first interface D 11  and the second interface D 21 , respectively. 
       FIG.  3    is a schematic diagram of the vertical projection areas of die D 1 , D 2  on the package substrate  120  or the interposer layer  130  and the decoupling capacitor in some embodiments of the present disclosure. as mentioned above, in the present disclosure, the decoupling capacitor Cd of the decoupling area  300  is arranged adjacent to the vertical projection areas of the two interfaces D 11  and D 21  to solve the noise problem of the die.  FIG.  3    shows the locations of multiple nodes B 11 -B 15 , B 21 -B 25 . In one embodiment, the nodes B 11 -B 15 , B 21 -B 25  represent bumps BP 1  between the package substrate  120  and the interposer layer  130  in  FIG.  2   , or represent bumps BP 2  between the package substrate  120  and the circuit board  110  in  FIG.  2   . 
     Nodes B 11 -B 15  is electrically connected to the the first interface D 11 , and nodes B 21 -B 25  is electrically connected to the second interface D 21 . For example, the nodes B 11 , B 12  are used as multiple first power nodes of the first interface D 11  of the first die D 10 , and the node B 13  is used as the first ground node of the first interface D 11  of the first die D 10 . Similarly, the nodes B 21  and B 22  are used as multiple second power nodes of the second interface D 21  of the second die D 20 , and the nodes B 23  is used as the second ground node of the second interface D 21  of the second die D 20 . The nodes B 11 , B 12 , B 21 , B 22  are electrically connected to the first power node Vdd through the package substrate  120  and the circuit board  110 . The nodes B 13  and B 23  are connected to the second power node Vss through the decoupling capacitor Cd. 
     The embodiment in  FIG.  2    draws one decoupling capacitor Cd, but in some other embodiments, the semiconductor chiplet device  100  may include multiple decoupling capacitors. As shown in  FIG.  3   , in one embodiment, the semiconductor chiplet device  100  includes a first decoupling capacitor C 1 , a second decoupling capacitor C 2  and a third decoupling capacitor C 3  (i.e., the decoupling capacitor Cd in  FIG.  2   ). All of the decoupling capacitors C 1 -C 3  are electrically connected to the first power node Vdd and the second power node Vss through the interposer layer  130 , the package substrate  120  and the circuit board  110 . The decoupling capacitors C 1 -C 3  are connected in parallel with each other. As shown in  FIG.  3   , the position of the first decoupling capacitor C 1  is arranged in a first vertical projection area of the first interface D 11 , and the second decoupling capacitor C 2  is arranged in a second vertical projection area of the second interface D 21 . The third decoupling capacitor C 3  is arranged between the first vertical projection area and the second vertical projection area. As mentioned above, the decoupling capacitors C 1 -C 3  can be arranged on the interposer layer  130  or the package substrate  120 . “The vertical projection area” refers to the projection area of the interfaces D 11 , D 21  on the interposer layer  130  or the package substrate  120 . 
     In one embodiment, the first decoupling capacitor C 1  is arranged between the nodes B 11  and B 12  connected to the first power node Vdd. The second decoupling capacitor C 2  is arranged between the nodes B 21  and B 22 , wherein the nodes B 21  and B 22  are connected to the first power node Vdd. The above “position” is a vertical projection position corresponding to the semiconductor chiplet device  100 . 
     In some embodiments, the first die D 1  and the second die D 2  operate in different power domains. In other words, the operating voltages of the first die D 1  and the second die D 2  are different from each other. In addition, when the first die D 1  and the second die D 2  operate in different power domains, the semiconductor chiplet device  100  will generate the switching noise (simultaneously switching noise, SSN). The switching noise is generated by the first die D 1  or the second die D 2 . The decoupling capacitor Cd may transmit the switching noise to the second power node Vss, so that the switching noise will not affect the power supply stability of the first power node Vdd. 
     The elements, method steps, or technical features in the foregoing embodiments may be combined with each other, and are not limited to the order of the specification description or the order of the drawings in the present disclosure. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the present disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this present disclosure provided they fall within the scope of the following claims.