A control chip for radio frequency switch, radio frequency switch module and packaging process thereof

Abstract

The present invention discloses a control chip for radio frequency switch, a radio frequency switch module and a packaging process thereof, and relates to the field of radio frequency switch, wherein the control chip is connected to the radio frequency switch module through an output port, and a plurality of radio frequency switch units are arranged in the radio frequency switch module, and the redundant port can be connected to the corresponding output port on the basis of connecting the redundant port to the other output port, thereby realizing the short circuit between the two groups of output ports, so that the radio frequency switch units corresponding to the two groups of output ports shorted can only receive the same control signal, and are equivalent to the same radio frequency input and radio frequency output, and are used as a branch, thereby using the plurality of radio frequency switch units as radio frequency switches with different numbers of branches, and realizing various types of radio frequency switches. The complexity of the design and production process of the radio frequency switch is greatly reduced, and the cost is saved; the development cycle of the radio frequency switch can be effectively reduced, and the stocking cycle can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency switches, and in particular to a control chip for a radio frequency switch, a radio frequency switch module and a packaging process thereof. Background Art

[0002] RF switch is an important electronic device, widely used in communication equipment, radar systems, electronic test equipment and other fields. The main function of RF switch is to realize the routing switching of RF signal. By changing the state of the switch, different RF signal paths can be connected to realize signal transmission and switching. The design and manufacture of RF switch is a complex process, involving multiple technologies, such as microelectronics integration technology, electronic device manufacturing technology, etc.

[0003] At the same time, due to different application scenarios, there are currently various requirements for the types of RF switches. For example, commonly used RF switches include SP2T RF switches, SP3T RF switches, SP4T RF switches, etc., and the internal structures of different types of RF switches are somewhat different. Before each RF switch is produced, it is necessary to first determine the type of demand, and then design and produce the RF switch according to the demand type. This greatly increases the cost and complexity of the design and production process of RF switches. Summary of the invention

[0004] The purpose of the present invention is to provide a control chip for radio frequency switch, radio frequency switch module and packaging process thereof, and the output port is short-circuited through a redundant port, so that the radio frequency switch units corresponding to the two groups of output ports short-circuited can only receive the same control signal, and are equivalent to the same radio frequency input and radio frequency output, and are used as a branch, so that multiple radio frequency switch units are equivalent to radio frequency switches with different numbers of branches, and multiple types of radio frequency switches are realized. The complexity of the design and production process of radio frequency switches is greatly reduced, and costs are saved; the development cycle of radio frequency switches can be effectively reduced, and the stocking cycle can be reduced.

[0005] In a first aspect, the present invention provides a control chip for a radio frequency switch, comprising: N groups of output ports and N-2 groups of redundant ports, N being a positive integer greater than 1, and each group of the redundant ports being connected one-to-one with a group of the output ports.

[0006] In a second aspect, the present invention provides a SPMT radio frequency switch module, comprising a control chip and a switch chip for a radio frequency switch as described above, wherein the switch chip comprises N radio frequency switch units and N groups of control ports connected to the N radio frequency switch units in a one-to-one correspondence; M is a positive integer greater than 1, and M is not greater than N;

[0007] The N groups of control ports are connected to the N groups of output ports of the control chip in a one-to-one correspondence;

[0008] There are NM groups of redundant ports in the redundant ports, which are additionally connected to other output ports through external wiring, wherein the other output ports are any output ports corresponding to the M groups of redundant ports except the NM groups of redundant ports in the redundant ports, so that the RF switch module is equivalent to an RF switch with M RF inputs and one RF output through the short circuit between the two groups of the output ports.

[0009] Optionally, several pin pads are further included. For any radio frequency switch unit, its radio frequency input terminal and radio frequency output terminal are connected to the pin pads through bonding wires.

[0010] Optionally, when two groups of output ports of two radio frequency switch units are short-circuited by the redundant port, the radio frequency output ends of the two radio frequency switch units are connected to the same pin pad.

[0011] Optionally, the control end of the radio frequency switch unit includes a first control end and a second control end, and the radio frequency switch unit includes:

[0012] A first switch module, wherein the first end serves as the RF input end of the RF switch unit, the second end serves as the RF output end of the RF switch unit, and the control end serves as the first control end of the RF switch unit;

[0013] The second switch module has a first end connected to the first end of the first switch module, a second end connected to the ground, and a control end serving as a second control end of the radio frequency switch unit.

[0014] Optionally, the first switch module includes:

[0015] A first switch tube, a first end of which serves as a radio frequency input end of the radio frequency switch unit and is connected to a first end of the second switch module, and a second end of which serves as a radio frequency output end of the radio frequency switch unit;

[0016] A first resistor has a first end connected to the control end of the first switch tube, and a second end serving as a first control end of the radio frequency switch unit.

[0017] Optionally, the first switch module further includes:

[0018] A second switch tube, a first end of which serves as a radio frequency input end of the radio frequency switch unit and is connected to a first end of the second switch module, and a second end of which is connected to a first end of the first switch tube;

[0019] A second resistor has a first end connected to the control end of the second switch tube, and a second end connected to the second end of the first resistor.

[0020] Optionally, the second switch module includes:

[0021] A third switch tube, a first end of which is connected to the first end of the first switch module, and a second end of which is grounded;

[0022] A third resistor has a first end connected to the control end of the third switch tube, and a second end serving as a second control end of the radio frequency switch unit.

[0023] Optionally, the second switch module further includes:

[0024] a fourth switch tube, a first end of which is connected to the second end of the third switch tube, and a second end of which is grounded;

[0025] A fourth resistor has a first end connected to the control end of the fourth switch tube, and a second end connected to the second end of the third resistor.

[0026] In a third aspect, the present invention provides a SPMT radio frequency switch module packaging process, including:

[0027] Obtain the switch chip provided in the second aspect;

[0028] Obtaining the control chip for the radio frequency switch provided in the first aspect;

[0029] Connecting the N groups of output ports of the RF switch control chip to the N groups of control ports of the switch chip in a one-to-one correspondence;

[0030] Determine a connection relationship between the redundant port and the output port according to the values ​​of M and N, and connect the redundant port and the output port based on the determined connection relationship;

[0031] The RF input end and the RF output end of each RF switch unit are connected to the pin pad according to the values ​​of M and N and the connection relationship between the redundant port and the output port.

[0032] The present invention provides a control chip for radio frequency switch, including N groups of output ports and N-2 groups of redundant ports, the control chip is connected to the radio frequency switch module through the output port, and a plurality of radio frequency switch units are directly set in the radio frequency switch module. When the types of radio frequency switches required are different, the redundant ports on the control chip can be connected to the output ports in a one-to-one correspondence according to the required type of the radio frequency switch module, and the redundant ports can be additionally connected with other output ports, thereby realizing the short circuit between the two groups of output ports, so that the radio frequency switch units corresponding to the two groups of shorted output ports can only receive the same control signal, and are equivalent to the same radio frequency input and radio frequency output, and are used as a branch, so that the plurality of radio frequency switch units are equivalent to radio frequency switches with different numbers of branches, and multiple types of radio frequency switches are realized. The complexity of the design and production process of the radio frequency switch is greatly reduced, and the cost is saved; the development cycle of the radio frequency switch can be effectively reduced, and the stocking cycle can be reduced.

[0033] The present invention also provides a SPMT radio frequency switch module and a packaging process thereof, which have the same beneficial effects as the above-mentioned radio frequency switch control chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic structural diagram of a radio frequency switch module provided by the present invention;

[0036] Figure 2 A schematic diagram of the structure of a control chip for a radio frequency switch provided by the present invention;

[0037] Figure 3 A schematic structural diagram of a radio frequency switch unit provided by the present invention;

[0038] Figure 4 A schematic diagram of the structure of another radio frequency switch module provided by the present invention;

[0039] Figure 5 A schematic diagram of the packaging structure of an SP4T radio frequency switch provided by the present invention;

[0040] Figure 6 A schematic diagram of the packaging structure of an SP2T radio frequency switch provided by the present invention;

[0041] Figure 7 A schematic diagram of the packaging structure of an SP3T radio frequency switch provided by the present invention;

[0042] Figure 8 A schematic diagram of the internal circuit structure of a radio frequency switch unit provided by the present invention. DETAILED DESCRIPTION

[0043] The core of the present invention is to provide a control chip for RF switch, RF switch module and packaging process thereof, and short-circuit the output port through the redundant port, so that the RF switch units corresponding to the two short-circuited output ports can only receive the same control signal, and are equivalent to the same RF input and RF output, and are used as a branch, so that multiple RF switch units are equivalent to RF switches with different numbers of branches, and various types of RF switches are realized. The complexity of the design and production process of RF switches is greatly reduced, and costs are saved; the development cycle of RF switches can be effectively reduced, and the stocking cycle can be reduced.

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a radio frequency switch module provided by the present invention; please refer to Figure 2 , Figure 2 A schematic diagram of the structure of a control chip for a radio frequency switch provided by the present invention; In a first aspect, the present invention provides a control chip 2 for a radio frequency switch, comprising: N groups of output ports and N-2 groups of redundant ports, N is a positive integer greater than 1, and each group of redundant ports is connected to a group of output ports in a one-to-one correspondence.

[0046] In order to realize various types of RF switches, the present application provides a control chip 2 for RF switches including N groups of output ports and N-2 groups of redundant ports. When used, the first end of the redundant port of the N-2 group will be connected to the N-2 group of output ports in the N groups of output ports by default, and then determine whether the second end of the redundant port needs to be connected to another group of output ports according to the type of RF switch required, and connect the two ends of the redundant port to different groups of output ports respectively, so as to achieve short circuit of the two groups of output ports. The present application does not make any special restrictions on the specific types and implementation methods of the output ports and redundant ports. The redundant ports need to be set to N-2 groups so that the final RF switch module can realize a series of types of RF switches from SP2T, SP3T...SPNT, etc.

[0047] Specifically, Figure 2 As shown, taking N as 4 as an example, four groups of output ports are set on the control chip 2, including output port 371, output port 372, output port 373, output port 374, output port 375, output port 376, output port 377 and output port 378, and two groups of redundant ports are set, including redundant port 381, redundant port 382, ​​redundant port 383 and redundant port 384. The redundant port 381 is directly fixedly connected to the output port 373 during the chip design process, the redundant port 382 is directly fixedly connected to the output port 374 during the chip design process, and the redundant port 383 is directly fixedly connected to the output port 375 during the chip design process. During the chip design process, the redundant port 384 is directly and fixedly connected to the output port 376. Later, according to the different types of RF switches required, it can be flexibly selected whether the redundant port 381 needs to be connected to the output port 371, whether the redundant port 382 needs to be connected to the output port 372, so as to achieve the short circuit between the output port 371 and the output port 373, and the output port 372 and the output port 374, whether the redundant port 383 needs to be connected to the output port 377, and whether the redundant port 384 needs to be connected to the output port 378, so as to achieve the short circuit between the output port 377 and the output port 375, and the output port 378 and the output port 376.

[0048] The present invention provides a control chip 2 for radio frequency switch, including N groups of output ports and N-2 groups of redundant ports, the control chip 2 is connected to the radio frequency switch module through the output port, and a plurality of radio frequency switch units 1 are directly arranged in the radio frequency switch module. When the types of radio frequency switches required are different, the redundant ports on the control chip 2 can be connected to the output ports in a one-to-one correspondence according to the required type of the radio frequency switch module, and the redundant ports can be additionally connected to other output ports, thereby realizing the short circuit between the two groups of output ports, so that the radio frequency switch units 1 corresponding to the two groups of output ports shorted can only receive the same control signal, and are equivalent to the same radio frequency input and radio frequency output, and are used as a branch, so that the plurality of radio frequency switch units 1 are equivalent to radio frequency switches with different numbers of branches, and multiple types of radio frequency switches are realized. The complexity of the design and production process of the radio frequency switch is greatly reduced, and the cost is saved; the development cycle of the radio frequency switch can be effectively reduced, and the stocking cycle can be reduced.

[0049] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a radio frequency switch unit provided by the present invention; please refer to Figure 4 , Figure 4A schematic diagram of the structure of another radio frequency switch module provided by the present invention; In a second aspect, the present invention provides a SPMT radio frequency switch module, comprising a control chip 2 for a radio frequency switch and a switch chip as described above, wherein the switch chip comprises N radio frequency switch units 1 and N groups of control ports connected to the N radio frequency switch units 1 in a one-to-one correspondence; M is a positive integer greater than 1, and M is not greater than N;

[0050] The N groups of control ports are connected one-to-one with the N groups of output ports of the control chip 2;

[0051] There are NM groups of redundant ports in the redundant ports, which are additionally connected to other output ports through external wiring, wherein the other output ports are any output ports corresponding to the M groups of redundant ports except the NM group of redundant ports in the redundant ports, so that the RF switch module is equivalent to an RF switch with M RF inputs and one RF output through the short circuit between the two groups of output ports.

[0052] It is not difficult to understand that, based on the above-mentioned control chip 2 for RF switch, the RF switch module also includes a switch chip, and N RF switch units 1 are arranged in the switch chip. The RF switch units 1 are connected to the output ports of the control chip 2 through the control ports connected one by one, and are turned on or off under the control of the control chip 2, thereby realizing the signal path switching function of the RF switch. Each group of control ports is directly and fixedly connected to the control end of the corresponding RF switch unit 1 during the chip design process, so that the RF switch unit 1 receives the control instruction of the control chip 2 through the control port; at the same time, the redundant ports in the control chip 2 are connected one by one with the corresponding output ports thereof, and it is also necessary to determine the NM groups of redundant ports that need to be additionally connected according to the type of RF switch required, that is, the specific value of M of the SPMT RF switch module required. At this time, the output ports corresponding to the NM groups of redundant ports are the normally used input ports. output port, and the output ports corresponding to the M groups of redundant ports except the NM groups of redundant ports are other output ports. Any group of redundant ports in the NM groups of redundant ports needs to be additionally connected with any group of other output ports, so that a group of normally used output ports corresponding to itself is short-circuited with a group of output ports in other output ports. At this time, the two short-connected groups of output ports can only output the same control signal. The two RF switch units corresponding to the two short-connected groups of output ports will maintain the same working state under the action of the same control signal of the control chip 2, that is, the two RF switch units corresponding to the two short-connected groups of output ports are equivalent to the same branch during the working process. The NM groups of redundant ports all short-circuit the two groups of output ports. Therefore, there are only M kinds of control signals output by the control chip 2 to the switch chip, and the N RF switch units 1 in the switch chip are equivalent to M branches, thereby realizing the SPMT RF switch module.

[0053] It is not difficult to understand that in the additional connection process between the NM group redundant ports and other output ports, there may be a one-to-one corresponding connection relationship, or there may be a situation where multiple redundant ports are connected to the output port of the same other output port. For example, when N is 5 and M is 2, there are 5 RF switch units in the RF switch module, and an SP2T RF switch module needs to be implemented, then the control chip 2 only needs to output two different control signals to any two RF switch units. At this time, three groups of redundant ports and five groups of output ports are set on the control chip 2. It is defined that the first group of output ports is connected to the control end of the first RF switch unit through the first group of control ports, the second group of output ports is connected to the control end of the second RF switch unit through the second group of control ports, the third group of output ports is connected to the control end of the third RF switch unit through the third group of control ports, the fourth group of output ports is connected to the control end of the fourth RF switch unit through the fourth group of control ports, and the fifth group of output ports is connected to the control end of the fifth RF switch unit through the fifth group of control ports. By default, the first group of redundant ports is fixedly connected to the first group of output ports, the second group of redundant ports is fixedly connected to the third group of output ports, and the third group of redundant ports is connected to the fifth group of output ports by default. When the redundant ports are not additionally connected, the five RF switch units in the RF switch module receive five different control signals as SP5T RF switches. If SP2T is currently required, all three groups of redundant ports need to be additionally connected. In addition to being fixedly connected to the first group of output ports, one group of redundant ports can be connected to the second group of output ports, short-circuiting the first group of output ports and the second group of output ports. In addition to being fixedly connected to the third group of output ports, the second group of redundant ports can be connected to the second group of output ports or the fourth group of output ports, short-circuiting the second group of output ports (or the fourth group of output ports) and the third group of output ports. In addition to being fixedly connected to the fifth group of output ports, the third group of redundant ports can be connected to the fourth group of output ports, short-circuiting the fourth group of output ports and the fifth group of output ports. In this case, during the operation of the RF switch module, the first group of output ports, the second group of output ports and the third group of output ports will all output the first control instruction, the first RF switch unit, the second RF switch unit and the third RF switch unit will act as a branch, the fourth group of output ports and the fifth group of output ports will all output the second control instruction, and the fourth RF switch unit and the fifth RF switch unit will act as a branch, thereby realizing the SP2T RF switch.If the current requirement is an SP3T RF switch, only two of the three groups of redundant ports need to be additionally connected. For example, the first group of redundant ports can be connected to the second group of output ports in addition to being fixedly connected to the first group of output ports, and the first group of output ports and the second group of output ports are short-circuited. The second group of redundant ports can be connected to the fourth group of output ports in addition to being fixedly connected to the third group of output ports, and the fourth group of output ports and the third group of output ports are short-circuited. The third group of redundant ports does not need to be additionally connected, and only needs to maintain a fixed connection with the fifth group of output ports. In this case, during the operation of the RF switch module, the first group of output ports and the second group of output ports will both output the first control instruction, the first RF switch unit and the second RF switch unit will serve as a branch, the third group of output ports and the fourth group of output ports will both output the second control instruction, the third RF switch unit and the fourth RF switch unit will serve as a branch, the fifth group of output ports will output the third control instruction alone, and the fifth RF switch unit will serve as a branch, thereby realizing the SP3T RF switch. ;

[0054] It should be noted that the additional connection between the redundant port of the NM group and other output ports is realized through external wiring during the packaging process of the RF switch module based on the type of RF switch actually required. The connection between the RF switch unit 1 and the corresponding control port, and between the redundant port and the initially corresponding output port is directly fixed internally during the chip design and manufacturing process; the specific types and implementation methods of the internal fixed connection wiring and the external wiring are not specifically limited in this application, and can be selected and set according to the actual application situation. The specific layout of each RF switch unit 1 and the control port in the RF switch module is not specifically limited in this application. In order to further reduce the volume and save costs, it can be considered to arrange the RF switch unit 1 in an array or symmetrical manner.

[0055] It is not difficult to understand that SPnT RF switches will have various requirements according to the differences in actual applications, such as SP2T, SP3T, SP4T, etc., but the structure of the switch circuit that switches the signal path is basically the same, only the number of branches is different. For example, SP2T requires two branches, SP3T requires three branches, and these branches are similar or identical in structure. Considering that the structures of each branch are basically similar, the present application proposes that a standard structure RF switch unit 1 can be used to implement the switch chip in the RF switch module. This minimum standard unit can be designed based on the size required by the full set switch SPNT RF switch, and multiple standard structure RF switch units 1 can be connected to form an RF switch through binding wires. By adjusting the wiring conditions of the redundant ports, multiple different types of RF switches can be realized. In the process of chip design and manufacturing, only the mask (mask version) and the entire switch chip need to be designed based on the full set switch SPNT RF switch, reducing the types of masks and reducing costs. For example, when the full set switch is an SP4T RF switch, the RF part corresponding to its RF switch unit 1 is merged, which is equivalent to increasing the size of each branch, and it can be equivalent to an SP2T RF switch.

[0056] It should be noted that the basic structures of the RF switch units 1 are the same, but the specific circuit implementations inside them may be different. Figure 3 , Figure 3 A schematic diagram of the structure of a radio frequency switch unit provided by the present invention; the radio frequency switch unit 1 includes radio frequency input terminals 352 and 355, radio frequency output terminals 353 and 354, a series tube core 342, a parallel tube core 341 and a ground terminal 351, the control end of the series tube core 342 serves as the first control terminal AS of the radio frequency switch unit 1, the control end of the parallel tube core 341 serves as the second control terminal AP of the radio frequency switch unit 1, the first control terminal AS and the second control terminal AP are respectively connected to the control chip 2 through two control ports in a group of control ports, and the control chip 2 can control the radio frequency input terminal to be connected to the ground terminal or the radio frequency input terminal to be connected to the radio frequency output terminal through the first control terminal AS and the second control terminal AP, thereby realizing different output paths of the radio frequency signal. The present application does not make any special restrictions on the specific internal circuit structure of each radio frequency switch unit 1, and its basic structure satisfies Figure 3 The standard structure shown is sufficient, and the RF output end can be further connected to output structures such as an antenna when used.

[0057] It can be understood that for an RF switch unit 1, it is necessary to implement the switching process of different signal paths. Therefore, each RF switch unit 1 requires a group of control ports, usually a group of control ports includes two control ports, and the specific number and implementation method of a group of control ports can be adjusted and set according to actual needs; in order to facilitate the connection with the control chip 2, the control port is usually set on one side of the RF switch module.

[0058] Specifically, Figure 4 As shown, taking N=4 as an example, RF switch unit A, RF switch unit B, RF switch unit C and RF switch unit D are set in the full set switch, and in order to further reduce the area and cost of the entire module, some RF switch units 1 in the RF switch module can share a RF output port, RF switch unit A and RF switch unit B share a RF output port, and are symmetrically arranged based on the shared RF output port, RF switch unit C and RF switch unit D share a RF output port, and are symmetrically arranged based on the shared RF output port, and the RF switch module includes 4 groups of control ports, including a control port 321 of the control end of the parallel tube core internally connected to the RF switch unit D, and a control port 322 of the control end of the parallel tube core internally connected to the RF switch unit D. The control port 322 of the control end of the series tube core, the control port 323 of the control end of the parallel tube core connected to the internal RF switch unit A, the control port 324 of the control end of the series tube core connected to the internal RF switch unit A, the control port 325 of the control end of the series tube core connected to the internal RF switch unit B, the control port 326 of the control end of the parallel tube core connected to the internal RF switch unit B, the control port 327 of the control end of the series tube core connected to the internal RF switch unit C, and the control port 328 of the control end of the parallel tube core connected to the internal RF switch unit C. At the same time, each control port is externally connected to the control chip 2 to realize the on-off control of the series tube core and the parallel tube core of each RF switch unit 1.

[0059] In particular, the solution proposed by the present invention can be applied to SP4T and SP2T, and is particularly suitable for scenarios where the two have different power requirements. SP4T can be merged into SP2T through binding wires, and when SP2T is used, the area of ​​each branch is increased, and the branch with increased area can effectively improve harmonics and insertion loss. The control line realizes SP4T or SP2T through different connection methods, and can also be used for asymmetric SP3T and other types of RF switches.

[0060] The present invention provides an SPMT radio frequency switch module, which first designs the radio frequency switch units 1 of each standard structure based on the size definition required by the full set of SPNT switches, divides the full set of SPNT switches into multiple standard units, and realizes multiple subset switches through multiple standard radio frequency switch units 1, each radio frequency switch unit 1 independently leads the control line to the control port, and then uses the output port and redundant port on the control chip 2 to realize the radio frequency switches of types such as SP2T, SP3T, and SP4T. In the process of chip design and production, it is only necessary to set a die (crystal), a set of masks and a wafer (wafer) based on the full set of switches, and the same die can be used to meet the requirements of multiple different types of radio frequency switches, and the same set of masks and the same wafer can be reused, which can effectively reduce the mask investment in the chip design and production process, reduce the development cycle, and reduce the stocking cycle.

[0061] Based on the above examples: Figure 5 , Figure 5 This is a schematic diagram of the packaging structure of an SP4T RF switch provided by the present invention; please refer to Figure 6 , Figure 6 This is a schematic diagram of the packaging structure of a SP2T RF switch provided by the present invention; please refer to Figure 7 , Figure 7 A schematic diagram of the packaging structure of an SP3T radio frequency switch provided by the present invention;

[0062] As an optional embodiment, it also includes a plurality of pin pads. For any RF switch unit 1, its RF input terminal and RF output terminal are connected to the pin pads through bonding wires.

[0063] Furthermore, considering that the RF input and RF output of each RF switch unit 1 need to be connected to an external circuit, a pad (metal block) needs to be designed on the RF switch module as a pin pad. The metal block is connected to the internal circuit of the switch. The RF input and RF output of the RF switch unit 1 are welded to the pad, and the pad is used as a support to achieve connection with an external circuit or device. The connection between the RF input or RF output of the RF switch unit 1 and the pin pad can be achieved by bonding wires. The specific type and implementation method of the bonding wires are not specifically limited in this application. The pad can be designed in a centrally symmetrical manner to facilitate welding of different RF switch units 1. At the same time, considering that the RF switch chip proposed in this application can realize multiple types of RF switches, when designing the pad, it is best to set some redundant pads additionally, considering the maximum number of pads required by the RF switch chip in the process of realizing the RF switch, so that the RF switch chip can accurately realize different types of RF switches. The specific number, type and implementation method of the pad are not specifically limited in this application.

[0064] Specifically, considering that the RF switch unit 1 is required to realize the transmission of RF signals when the RF switch module is applied, the RF input and RF output ends of the RF switch unit 1 need to be reliably connected to the external circuit through pin pads to ensure the accurate application of the entire RF switch module.

[0065] As an optional embodiment, when two groups of output ports of two RF switch units are short-circuited by redundant ports, the RF output ends of the two RF switch units are connected to the same pin pad.

[0066] It is not difficult to understand that each RF switch unit 1 has its own independent RF input terminal and RF output terminal, and when the output port corresponding to a certain RF switch unit is short-circuited with the output port corresponding to another RF switch unit under the action of the redundant port, the two RF switch units are used as the same branch, and the RF input terminals of both need to be connected to the same pin pad and share a peripheral pad. Similarly, the RF output terminals also need to be connected to the same pin pad and share a peripheral pad. Whether the wiring connection of the RF input terminal or the RF output terminal of the RF unit needs to share the pad needs to be determined according to the specific connection method of the redundant port.

[0067] It should be noted that there is a one-to-one correspondence between the RF switch unit 1 corresponding to the shared pad connected by bonding and the additional output ports connected by bonding to the redundant port. When the output port corresponding to a certain RF switch unit is used as another output port and is connected to the redundant port by additional external bonding, the RF input end of this RF switch unit needs to share the pad with the RF input end of the RF switch unit corresponding to the output port that is fixedly connected to the additional redundant port itself, that is, the RF switch unit with the shared pad corresponds to the RF switch unit 1 corresponding to the short-circuited output port. When the output ports corresponding to the two RF switch units are short-circuited, their RF input ends or RF output ends also correspond to the shared pad.

[0068] Specifically, in order to further equate multiple RF switch units 1 to one branch, it is not only necessary to short-circuit their corresponding output ports through redundant ports, but also necessary to use a common pad to equate their RF input ends to one input, and / or their RF output ends to one output.

[0069] Please refer to Figure 8 , Figure 8 The schematic diagram of the internal circuit structure of a radio frequency switch unit provided by the present invention. As an optional embodiment, the control end of the radio frequency switch unit 1 includes a first control end and a second control end, and the radio frequency switch unit 1 includes:

[0070] A first switch module, wherein the first end serves as the RF input end of the RF switch unit 1, the second end serves as the RF output end of the RF switch unit 1, and the control end serves as the first control end AS of the RF switch unit 1;

[0071] The second switch module has a first end connected to the first end of the first switch module, a second end connected to the ground, and a control end serving as the second control end AP of the RF switch unit 1 .

[0072] It is not difficult to understand that the switch module can be used inside the RF switch unit 1 to switch the signal path. The first switch module is connected in series between the RF input terminal and the RF output terminal, and a grounded second switch module is connected in parallel, that is, the first switch module is used as a series die, and the second switch module is used as a parallel die. The control chip controls the RF switch unit 1 by controlling the on and off of the series die and the parallel die, thereby realizing the switching process of the signal path. The specific type and implementation method of the first switch module and the second switch module are not particularly limited in this application.

[0073] Specifically, the controllable switch module can effectively realize the switching process of the signal path of the RF switch unit 1. The internal structure of the entire RF switch unit 1 is simple and easy to implement, which is conducive to the simple implementation and integrated packaging of the entire RF switch module.

[0074] As an optional embodiment, the first switch module includes:

[0075] The first switch tube T1 has a first end serving as a radio frequency input end of the radio frequency switch unit 1 and connected to a first end of the second switch module, and a second end serving as a radio frequency output end of the radio frequency switch unit 1;

[0076] The first resistor R1 has a first end connected to the control end of the first switch tube T1 , and a second end serving as the first control end AS of the RF switch unit 1 .

[0077] It is not difficult to understand that the conduction or shutdown of the first switch module can be effectively achieved through the controllable first switch tube T1. At the same time, in order to ensure the accurate operation of the first switch tube T1, a first resistor R1 can also be set at the control end of the first switch tube T1. The first resistor R1 can play the role of circuit matching or bias circuit to avoid misconduction of the first switch tube T1. The specific type and implementation method of the first switch tube T1 and the first resistor R1 are not particularly limited in this application. The first switch tube T1 can be implemented by a switching device such as a MOS tube (Metal-Oxide-Semiconductor Field-Effect Transistor). The control end of the first switch tube T1 can be a gate, a drain or a source, which can be changed according to actual needs.

[0078] Specifically, the switch module can be effectively realized by adopting a controllable switch tube and a mesa resistor connected to the control end. The control end of the controllable switch tube is connected to the control chip through the mesa resistor to realize an accurate and reliable action process, thereby ensuring the accuracy and reliability of the working process of the RF switch.

[0079] As an optional embodiment, the first switch module further includes:

[0080] The second switch tube T2 has a first end serving as the RF input end of the RF switch unit 1 and connected to the first end of the second switch module, and a second end connected to the first end of the first switch tube T1;

[0081] The second resistor R2 has a first end connected to the control end of the second switch tube T2 , and a second end connected to the second end of the first resistor R1 .

[0082] Furthermore, in order to ensure the accuracy of the signal switching process of the RF switch unit 1, a second switch tube T2 and a second resistor R2 can be further set on the basis of the first switch tube T1 and the first resistor R1. The second switch tube T2 and the second resistor R2 are redundant designs, which are consistent with the working process of the first switch tube T1. The second switch tube T2 is connected to the control chip through the second resistor R2 to ensure the accuracy and reliability of the control process of the first switch module connecting the RF input end and the RF output end, and avoid the misoperation of the RF switch unit 1 caused by the misconduction of a single switch tube. The specific type and implementation method of the second switch tube T2 and the second resistor R2 are not particularly limited in this application, and can be consistent with the setting method of the first switch tube T1 and the first resistor R1.

[0083] Specifically, by adding a redundant design of the controllable switch in the first switch module, the accuracy and reliability of the control process of the control chip over the RF switch unit 1 can be further ensured, thereby avoiding malfunction of the RF switch unit 1 and ensuring the quality and reliability of the final RF switch.

[0084] As an optional embodiment, the second switch module includes:

[0085] A third switch tube T3, a first end of which is connected to the first end of the first switch module, and a second end of which is grounded;

[0086] The third resistor R3 has a first end connected to the control end of the third switch tube T3 , and a second end serving as the second control end AP of the RF switch unit 1 .

[0087] It is not difficult to understand that the conduction or shutdown of the second switch module can be effectively achieved through the controllable third switch tube T3. At the same time, in order to ensure the accurate operation of the third switch tube T3, a third resistor R3 can also be set at the control end of the third switch tube T3. The third resistor R3 can play the role of circuit matching or bias circuit to avoid misconduction of the third switch tube T3. The specific type and implementation method of the third switch tube T3 and the third resistor R3 are not particularly limited in this application. The third switch tube T3 can be implemented by a switching device such as a MOS tube. The control end of the third switch tube T3 can be a gate, a drain or a source, which can be changed according to actual needs.

[0088] Specifically, the switch module can be effectively realized by adopting a controllable switch tube and a mesa resistor connected to the control end. The control end of the controllable switch tube is connected to the control chip through the mesa resistor to realize an accurate and reliable action process, thereby ensuring the accuracy and reliability of the working process of the RF switch.

[0089] As an optional embodiment, the second switch module further includes:

[0090] A fourth switch tube T4, a first end of which is connected to the second end of the third switch tube T3, and a second end of which is grounded;

[0091] The fourth resistor R4 has a first end connected to the control end of the fourth switch tube T4, and a second end connected to the second end of the third resistor R3.

[0092] Further, in order to ensure the accuracy of the signal switching process of the RF switch unit 1, a fourth switch tube T4 and a fourth resistor R4 can be further set on the basis of the third switch tube T3 and the third resistor R3. The fourth switch tube T4 and the fourth resistor R4 are redundant designs and are consistent with the working process of the third switch tube T3. The fourth switch tube T4 is connected to the control chip through the fourth resistor R4 to ensure the accuracy and reliability of the control process of the second switch module connecting the RF input end and the RF output end, and avoid the misoperation of the RF switch unit 1 caused by the misconduction of a single switch tube. The specific type and implementation method of the fourth switch tube T4 and the fourth resistor R4 are not particularly limited in this application, and can be consistent with the setting method of the third switch tube T3 and the third resistor R3.

[0093] Specifically, by adding a redundant design of the controllable switch in the second switch module, the accuracy and reliability of the control process of the control chip over the RF switch unit 1 can be further ensured, thereby avoiding malfunction of the RF switch unit 1 and ensuring the quality and reliability of the final RF switch.

[0094] As a specific embodiment, taking N=4 as an example, when implementing the SP4T RF switch, the RF input ports of the four RF switch units inside the RF switch module are respectively connected to different pads, and the RF output ports can be connected to the same pad or different pads, and do not overlap with the pads connected to the RF input port. The redundant port only maintains a fixed connection with the corresponding output port, and does not make additional connections with other output ports through external wiring, that is, the redundant port 381 is only fixedly connected to the output port 373, the redundant port 382 is only fixedly connected to the output port 374, the redundant port 383 is only fixedly connected to the output port 375, and the redundant port 384 is only fixedly connected to the output port 376. Each output port is connected to the corresponding control port one by one, and each RF switch unit is connected to the control chip 2 through a different output port. When implementing the SP2T RF switch, the redundant port 381 is additionally connected to the output port 371 through an external wiring on the basis of being fixedly connected to the output port 373, the redundant port 382 is additionally connected to the output port 372 through an external wiring on the basis of being fixedly connected to the output port 374, the redundant port 383 is additionally connected to the output port 377 through an external wiring on the basis of being fixedly connected to the output port 375, and the redundant port 384 is additionally connected to the output port 378 through an external wiring on the basis of being fixedly connected to the output port 376, thereby realizing the parallel connection of the RF switch unit A and the RF switch unit D, and the parallel connection of the RF switch unit B and the RF switch unit C; at the same time, the RF input ports of the RF switch unit A and the RF switch unit D are connected to a same pad, and the RF input ports of the RF switch unit B and the RF switch unit C are connected to another same pad; the RF output ports can be connected to the same pad or different pads, as long as they do not overlap with other connected pads.When implementing the SP3T RF switch, the redundant port 381 is only fixedly connected to the output port 373, and the redundant port 382 is only fixedly connected to the output port 374, so that the RF switch unit A and the RF switch unit D can work independently. The redundant port 383 is additionally connected to the output port 377 through an external wiring on the basis of being fixedly connected to the output port 375, and the redundant port 384 is additionally connected to the output port 378 through an external wiring on the basis of being fixedly connected to the output port 376, so that the RF switch unit B and the RF switch unit C can be connected in parallel; at the same time, the RF input ports of the RF switch unit B and the RF switch unit C are connected to the same pad, the RF input port of the RF switch unit A is connected to another pad, and the RF input port of the RF switch unit D is connected to another pad. Another pad; it can also be set that the redundant port 381 is additionally connected to the output port 371 through an external wiring on the basis of being fixedly connected to the output port 373, and the redundant port 382 is additionally connected to the output port 372 through an external wiring on the basis of being fixedly connected to the output port 374, and the redundant port 383 is only fixedly connected to the output port 375, and the redundant port 384 is only fixedly connected to the output port 376. In this case, the RF input ports of the RF switch unit A and the RF switch unit D are connected to the same pad, the RF input port of the RF switch unit B is connected to another pad, and the RF input port of the RF switch unit C is connected to another pad; the RF output port can be connected to the same pad or a different pad, and does not overlap with other connected pads. The ground terminal 351 in the RF switch unit is connected to the ground through the ground lead 451, and the RF input terminal and RF output terminal of each RF switch unit are connected to the pad through the bonding wire 450.

[0095] At the same time, considering that the RF switch module usually only selects one input RF signal for output during application, the RF output ends of all RF switch units in the RF switch module can directly share a peripheral pad.

[0096] In a third aspect, the present invention provides a SPMT radio frequency switch module packaging process, including:

[0097] Obtain the switch chip provided in the second aspect;

[0098] Obtain the control chip 2 for the radio frequency switch provided in the first aspect;

[0099] Connect the N groups of output ports of the RF switch control chip 2 to the N groups of control ports of the switch chip in a one-to-one correspondence;

[0100] Determine a connection relationship between the redundant port and the output port according to the values ​​of M and N, and connect the redundant port and the output port based on the determined connection relationship;

[0101] The RF input terminal and the RF output terminal of each RF switch unit 1 are connected to the pin pad according to the values ​​of M and N and the connection relationship between the redundant port and the output port.

[0102] It is not difficult to understand that, during the packaging process, it is only necessary to connect and package the external wiring connection between the output port and the control port, the redundant port and other additional output ports, and the RF input and RF output of the RF switch unit 1 and the pin pad, and the specific connection relationship between the redundant port and other additional output ports and the external wiring between the RF input and RF output of the RF switch unit 1 and the pin pad needs to be determined according to the M value of the required SPMT RF switch module and the N value of the full set of switches. The specific determination process can refer to the above-mentioned SPMT RF switch module embodiment, and the present invention will not be repeated here. The connection between the control end and the control port of the RF switch unit 1, and between the redundant port and the initially corresponding output port is a fixed connection directly realized by internal wiring during chip design and manufacturing, and does not need to be realized by external wiring during the packaging process. The specific type and implementation method of the external wiring in the packaging process are not specifically limited in this application.

[0103] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0104] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A SPMT radio frequency switch module, characterized in that: The invention comprises a control chip (2) for a radio frequency switch and a switch chip, wherein the control chip for the radio frequency switch comprises: N groups of output ports and N-2 groups of redundant ports, N being a positive integer greater than 1, and each group of the redundant ports being connected to a group of the output ports in a one-to-one correspondence; the switch chip comprises N radio frequency switch units (1) and N groups of control ports being connected to the N radio frequency switch units (1) in a one-to-one correspondence; M is a positive integer greater than 1, and M is not greater than N; The N groups of control ports are connected to the N groups of output ports of the control chip (2) in a one-to-one correspondence; There are NM groups of redundant ports in the redundant ports, which are additionally connected to other output ports through external wiring, wherein the other output ports are any output ports corresponding to M-2 groups of redundant ports in the redundant ports except the NM group of redundant ports, so that the RF switch module is equivalent to an RF switch with M RF inputs and one RF output through the short circuit between the two groups of output ports.

2. The SPMT radio frequency switch module according to claim 1, characterized in that: It also comprises a plurality of pin pads. For any radio frequency switch unit (1), the radio frequency input end and the radio frequency output end thereof are both connected to the pin pads via bonding wires.

3. The SPMT radio frequency switch module according to claim 2, characterized in that: When two groups of output ports of two radio frequency switch units (1) are short-circuited by the redundant port, the radio frequency output ends of the two radio frequency switch units (1) are connected to the same pin pad.

4. The SPMT radio frequency switch module according to any one of claims 1 to 3, characterized in that: The control end of the radio frequency switch unit (1) comprises a first control end and a second control end, and the radio frequency switch unit (1) comprises: A first switch module, wherein the first end serves as a radio frequency input end of the radio frequency switch unit (1), the second end serves as a radio frequency output end of the radio frequency switch unit (1), and the control end serves as a first control end of the radio frequency switch unit (1); A second switch module, having a first end connected to the first end of the first switch module, a second end connected to the ground, and a control end serving as a second control end of the radio frequency switch unit (1).

5. The SPMT radio frequency switch module according to claim 4, characterized in that: The first switch module comprises: A first switch tube (T1), a first end of which serves as a radio frequency input end of the radio frequency switch unit (1) and is connected to a first end of the second switch module, and a second end of which serves as a radio frequency output end of the radio frequency switch unit (1); A first resistor (R1) has a first end connected to the control end of the first switch tube (T1), and a second end serving as a first control end of the radio frequency switch unit (1).

6. The SPMT radio frequency switch module according to claim 5, characterized in that: The first switch module further includes: A second switch tube (T2), a first end of which serves as a radio frequency input end of the radio frequency switch unit (1) and is connected to a first end of the second switch module, and a second end of which is connected to a first end of the first switch tube (T1); A second resistor (R2) has a first end connected to the control end of the second switch tube (T2), and a second end connected to the second end of the first resistor (R1).

7. The SPMT radio frequency switch module according to claim 4, characterized in that: The second switch module comprises: A third switch tube (T3), a first end of which is connected to the first end of the first switch module, and a second end of which is grounded; A third resistor (R3) has a first end connected to the control end of the third switch tube (T3), and a second end serving as a second control end of the radio frequency switch unit (1).

8. The SPMT radio frequency switch module according to claim 7, characterized in that: The second switch module further includes: a fourth switch tube (T4), a first end of which is connected to the second end of the third switch tube (T3), and a second end of which is grounded; A fourth resistor (R4) has a first end connected to the control end of the fourth switch tube (T4) and a second end connected to the second end of the third resistor (R3).

9. A SPMT RF switch module packaging process, characterized in that: include: Obtain the switch chip as claimed in claim 1; Obtain the control chip (2) for the radio frequency switch according to claim 1; Connecting the N groups of output ports of the radio frequency switch control chip (2) to the N groups of control ports of the switch chip in a one-to-one correspondence; Determine a connection relationship between the redundant port and the output port according to the values ​​of M and N, and connect the redundant port and the output port based on the determined connection relationship; The radio frequency input end and the radio frequency output end of each radio frequency switch unit (1) are connected to the pin pad according to the values ​​of M and N and the connection relationship between the redundant port and the output port.

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