Single-pole four-throw switch circuit suitable for broadband application and electronic equipment

Abstract

The invention discloses a single-pole four-throw switch circuit suitable for broadband application and electronic equipment. The single-pole four-throw switch circuit comprises a first microstrip line Z1, a T-junction microstrip line Z2, a first switch branch, a second switch branch, a third switch branch and a fourth switch branch. A plurality of series-parallel connection combination modules are adopted to form a switch branch, the grid electrode of each series-parallel connection combination module is controlled by inputting corresponding control voltage, so that the working state of the single-pole four-throw switch circuit is controlled, and when the single-pole four-throw switch circuit is in a turn-off state, the parallel connection parts in the series-parallel connection combination modules lead leakage signals to the ground; optimization of isolation under high frequency is realized, and the antenna is suitable for being applied to a broadband scene; the transistor of the series-parallel width combination of the active region in the series-parallel combination module is a combination device of an equivalent series transistor and an equivalent parallel transistor, the effect that one device serves as a circuit branch is achieved through the device, the circuit layout area is saved, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of radio frequency circuits, and in particular relates to a single-pole four-throw switch circuit and electronic equipment suitable for wide-band applications. Background Art

[0002] With the continuous evolution of mobile communication technology, the RF front end is facing more and more challenges. The widespread application of 5G technology requires the RF front end to support higher frequency bands, larger bandwidths and more complex modulation methods. The RF switch is an important part of the RF front end. The increased requirements for the RF front end also increase the performance requirements for the RF switch. In order to ensure that the receiver can cope with the needs of different complex environments, it is necessary to design an RF switch circuit that can handle higher power.

[0003] In wireless communication transceiver systems, high-performance switches are key modules that control the system's transmit and receive signals. For switching devices, it is necessary to take into account indicators such as insertion loss, isolation, and power capacity. Currently, RF switching circuits designed using GaN HEMT devices have been widely studied and applied. In 2022, the University of Electronic Science and Technology of China proposed a high-power, miniaturized, high-order switching topology using 100nm silicon-based GaN HEMT devices. In 2023, the University of Notre Dame used integrated Hf 0.5 Zr 0.5 GaN HEMT with O2 (HZO) ferroelectric (FE) gate stack is used to improve the performance of RF switches at millimeter wave frequencies. In 2007, Rockwell Collins of the United States first proposed a high-power hybrid SP4T RF switch and its driver based on GaN.

[0004] Existing RF circuits use independent field-effect transistors as RF front-end selection switches, which seriously deteriorate the isolation at high frequencies and are not conducive to broadband applications of RF circuits. On the other hand, traditional monolithic microwave integrated circuit designs mostly use traveling wave transmission structures to expand the operating frequency band of RF switches, but the microstrip line introduction area is large and the layout is more complex, which may increase the influence of electromagnetic effects between microstrips. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a single-pole four-throw switch circuit and electronic equipment suitable for wideband applications. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a single-pole four-throw switch circuit suitable for wideband applications, comprising:

[0007] A first microstrip line Z1, a T-junction microstrip line Z2, a first switch branch, a second switch branch, a third switch branch and a fourth switch branch; wherein,

[0008] The first end of the first microstrip line Z1 serves as the input end Port1 of the single-pole four-throw switch circuit, and the second end is connected to the input end of the T-junction microstrip line Z2;

[0009] The first output end of the T-junction microstrip line Z2 is connected to the input end of the first switch branch and the input end of the second switch branch respectively, and the second output end is connected to the input end of the third switch branch and the input end of the fourth switch branch respectively;

[0010] The output end of the first switch branch serves as the first output end Port2 of the single-pole four-throw switch circuit;

[0011] The output end of the second switch branch serves as the second output end Port3 of the single-pole four-throw switch circuit;

[0012] The output end of the third switch branch serves as the third output end Port4 of the single-pole four-throw switch circuit;

[0013] The output end of the fourth switch branch serves as the fourth output end Port5 of the single-pole four-throw switch circuit;

[0014] The first switch branch, the second switch branch, the third switch branch and the fourth switch branch each include a plurality of series-parallel combination modules;

[0015] The first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages.

[0016] In one embodiment of the present invention, any one of the first switch branch, the second switch branch, the third switch branch and the fourth switch branch includes:

[0017] a first sub-microstrip line, a first serial-parallel combination module, a second sub-microstrip line, a second serial-parallel combination module, a third sub-microstrip line, a third serial-parallel combination module and a fourth sub-microstrip line; wherein,

[0018] The first end of the first sub-microstrip line serves as the input end of the corresponding switch circuit, and the second end is connected to the input end of the first series-parallel combination module;

[0019] The first control voltage input terminal of the first series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the second sub-microstrip line;

[0020] The second end of the second sub-microstrip line is connected to the input end of the second series-parallel combination module;

[0021] The first control voltage input terminal of the second series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the third sub-microstrip line;

[0022] The second end of the third sub-microstrip line is connected to the input end of the third series-parallel combination module;

[0023] The first control voltage input terminal of the third series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the fourth sub-microstrip line;

[0024] The second end of the fourth sub-microstrip line serves as the output end of the corresponding switch circuit.

[0025] In one embodiment of the present invention, any one of the first series-parallel combination module, the second series-parallel combination module and the third series-parallel combination module includes:

[0026] Active area series-parallel width combination transistor, first bias resistor and second bias resistor; wherein,

[0027] The first end of the transistor of the active area series-parallel width combination is used as the input end of the series-parallel combination module, the second end is used as the output end of the series-parallel combination module, the series part control end is connected to the first end of the first bias resistor, and the parallel part control end is connected to the first end of the second bias resistor;

[0028] The second end of the first bias resistor serves as a first control voltage input end of the series-parallel combination module;

[0029] The second end of the second bias resistor serves as a second control voltage input end of the series-parallel combination module.

[0030] In one embodiment of the present invention, the transistor with active area series-parallel width combination includes:

[0031] Equivalent series transistors and equivalent parallel transistors; where,

[0032] The source of the equivalent series transistor is used as the first end of the transistor of the active area series-parallel width combination, the gate is used as the series part control end of the transistor of the active area series-parallel width combination, and the drain is used as the second end of the transistor of the active area series-parallel width combination;

[0033] The source of the equivalent parallel transistor is connected to the drain of the equivalent series transistor, the gate serves as the parallel part control terminal of the transistor of the active area series-parallel width combination, and the drain is grounded.

[0034] In one embodiment of the present invention, the first series-parallel combination module, the second series-parallel combination module and the third series-parallel combination module each include a series part and a parallel part.

[0035] In one embodiment of the present invention, the series connection part includes: the equivalent series transistor and the first bias resistor.

[0036] In one embodiment of the present invention, the parallel connection part includes: the equivalent parallel connection transistor and the second bias resistor.

[0037] In one embodiment of the present invention, the first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages, including:

[0038] By inputting the first preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the first switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the second switch branch, the third switch branch, and the fourth switch branch to turn off, so that the first switch branch of the single-pole four-throw switch circuit is turned on;

[0039] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the second switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL7, controlling the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the third switch branch, and the fourth switch branch to turn off, so that the second switch branch of the single-pole four-throw switch circuit is turned on;

[0040] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the third switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the third switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch to turn off, so that the third switch branch of the single-pole four-throw switch circuit is turned on;

[0041] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL7 , control the equivalent series transistors in all the series-parallel combination modules in the fourth switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL8 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the fourth switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch to turn off, so that the fourth switch branch of the single-pole four-throw switch circuit is turned on;

[0042] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent series transistors in all series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn off, so that the single-pole four-throw switch circuit is turned off.

[0043] In a second aspect, the present invention provides an electronic device, the electronic device comprising:

[0044] A single-pole four-throw switch circuit suitable for wide-band applications as described in the first aspect.

[0045] Beneficial effects of the present invention:

[0046] In the solution provided by the present invention, multiple series-parallel combination modules are used to form four switch branches. By inputting the corresponding control voltage, the gate of each series-parallel combination module is controlled, thereby controlling the working state of the single-pole four-throw switch circuit. When the single-pole four-throw switch circuit is in the off state, the parallel part in the series-parallel combination module introduces the leakage signal into the ground, thereby optimizing the isolation at high frequency and being suitable for application in wide-band scenarios; further, the transistor with a series-parallel width combination in the active area in the series-parallel combination module designed by the present invention is a combination device of an equivalent series transistor and an equivalent parallel transistor. The device is used to realize the role of one device as a circuit branch, greatly saving the circuit layout area and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of a single-pole four-throw switch circuit suitable for wideband applications provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of the structure of a single-pole four-throw switch circuit suitable for wide-band applications provided by an embodiment of the present invention;

[0049] Figure 3 A three-dimensional diagram of the device structure of a transistor with a series-parallel width combination of active regions provided by an embodiment of the present invention;

[0050] Figure 4 A simulation result diagram of a single-pole four-throw switch circuit suitable for wide-band applications provided by an embodiment of the present invention;

[0051] Figure 5A circuit plane layout of a single-pole four-throw switch circuit suitable for wide-band applications in an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0053] The embodiments of the present invention provide a single-pole four-throw switch circuit and electronic equipment suitable for wide-band applications.

[0054] Below, firstly, a single-pole four-throw switch circuit suitable for wide-band applications provided by an embodiment of the present invention is introduced.

[0055] like Figure 1 As shown, a single-pole four-throw switch circuit suitable for wideband applications provided by an embodiment of the present invention may include:

[0056] A first microstrip line Z1, a T-junction microstrip line Z2, a first switch branch, a second switch branch, a third switch branch and a fourth switch branch; wherein,

[0057] The first end of the first microstrip line Z1 serves as the input end of the single-pole four-throw switch circuit, and the second end is connected to the input end of the T-junction microstrip line Z2;

[0058] The first output end of the T-junction microstrip line Z2 is connected to the input end of the first switch branch and the input end of the second switch branch respectively, and the second output end is connected to the input end of the third switch branch and the input end of the fourth switch branch respectively;

[0059] The output end of the first switch branch serves as the first output end of the single-pole four-throw switch circuit;

[0060] The output end of the second switch branch serves as the second output end of the single-pole four-throw switch circuit;

[0061] The output end of the third switch branch serves as the third output end of the single-pole four-throw switch circuit;

[0062] The output end of the fourth switch branch serves as the fourth output end of the single-pole four-throw switch circuit;

[0063] The first switch branch, the second switch branch, the third switch branch and the fourth switch branch each include a plurality of series-parallel combination modules;

[0064] The first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages.

[0065] The single-pole four-throw switch circuit proposed in the embodiment of the present invention includes four switch branches, each switch branch is composed of a plurality of series-parallel combination modules; by inputting a corresponding control voltage, the gate of each series-parallel combination module is controlled, thereby controlling the working state of the single-pole four-throw switch circuit. When the single-pole four-throw switch circuit is in the off state, the parallel part in the series-parallel combination module directs the leakage signal into the ground, thereby achieving optimization of isolation at high frequency, and is suitable for application in wide-band scenarios.

[0066] For each switch branch proposed in the embodiment of the present invention, any one of the first switch branch, the second switch branch, the third switch branch and the fourth switch branch, such as Figure 2 As shown, it may include:

[0067] a first sub-microstrip line, a first serial-parallel combination module, a second sub-microstrip line, a second serial-parallel combination module, a third sub-microstrip line, a third serial-parallel combination module and a fourth sub-microstrip line; wherein,

[0068] The first end of the first sub-microstrip line serves as the input end of the corresponding switch circuit, and the second end is connected to the input end of the first series-parallel combination module;

[0069] The first control voltage input terminal of the first series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the second sub-microstrip line;

[0070] The second end of the second sub-microstrip line is connected to the input end of the second series-parallel combination module;

[0071] The first control voltage input terminal of the second series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the third sub-microstrip line;

[0072] The second end of the third sub-microstrip line is connected to the input end of the third series-parallel combination module;

[0073] The first control voltage input terminal of the third series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the fourth sub-microstrip line;

[0074] The second end of the fourth sub-microstrip line serves as the output end of the corresponding switch circuit.

[0075] Understandable, such as Figure 2As shown in , for the first switch branch, the first sub-microstrip line is Z3, the second sub-microstrip line is Z4, the third sub-microstrip line is Z5, the fourth sub-microstrip line is Z6, the first series-parallel combination module is located between Z3 and Z4, the second series-parallel combination module is located between Z4 and Z5, and the third series-parallel combination module is located between Z5 and Z6. For the second switch branch, the first sub-microstrip line is Z7, the second sub-microstrip line is Z8, the third sub-microstrip line is Z9, the fourth sub-microstrip line is Z10, the first series-parallel combination module is located between Z7 and Z8, the second series-parallel combination module is located between Z8 and Z9, and the third series-parallel combination module is located between Z9 and Z10. For the third switch branch, the first sub-microstrip line is Z11, the second sub-microstrip line is Z12, the third sub-microstrip line is Z13, the fourth sub-microstrip line is Z14, the first series-parallel combination module is located between Z11 and Z12, the second series-parallel combination module is located between Z12 and Z13, and the third series-parallel combination module is located between Z13 and Z14. For the fourth switch branch, the first sub-microstrip line is Z15, the second sub-microstrip line is Z16, the third sub-microstrip line is Z17, and the fourth sub-microstrip line is Z18. The first series-parallel combination module is located between Z15 and Z16, the second series-parallel combination module is located between Z16 and Z17, and the third series-parallel combination module is located between Z17 and Z18.

[0076] Any one of the first series-parallel combination module, the second series-parallel combination module, and the third series-parallel combination module may include:

[0077] Active area series-parallel width combination transistor, first bias resistor and second bias resistor; wherein,

[0078] The first end of the transistor of the active area series-parallel width combination is used as the input end of the series-parallel combination module, the second end is used as the output end of the series-parallel combination module, the series part control end is connected to the first end of the first bias resistor, and the parallel part control end is connected to the first end of the second bias resistor;

[0079] The second end of the first bias resistor serves as a first control voltage input end of the series-parallel combination module;

[0080] The second end of the second bias resistor serves as a second control voltage input end of the series-parallel combination module.

[0081] Understandable, such as Figure 2 As shown in FIG. 1 , for the first series-parallel combination module in the first switch branch, the transistor of the active region series-parallel width combination is M1, and the first bias resistor is R g1 , the second bias resistor is R g2 For the second series-parallel combination module in the first switch branch, the transistor of the active area series-parallel width combination is M2, and the first bias resistor is Rg3 , the second bias resistor is R g4 For the third series-parallel combination module in the first switch branch, the transistor of the active area series-parallel width combination is M3, and the first bias resistor is R g5 , the second bias resistor is R g6 For the first series-parallel combination module in the second switch branch, the transistor of the active area series-parallel width combination is M4, and the first bias resistor is R g7 , the second bias resistor is R g8 For the second series-parallel combination module in the second switch branch, the transistor of the active area series-parallel width combination is M5, and the first bias resistor is R g9 , the second bias resistor is R g10 For the third series-parallel combination module in the second switch branch, the transistor of the active area series-parallel width combination is M6, and the first bias resistor is R g11 , the second bias resistor is R g12 For the first series-parallel combination module in the third switch branch, the transistor of the active area series-parallel width combination is M7, and the first bias resistor is R g13 , the second bias resistor is R g14 For the second series-parallel combination module in the third switch branch, the transistor of the active area series-parallel width combination is M8, and the first bias resistor is R g15 , the second bias resistor is R g16 For the third series-parallel combination module in the third switch branch, the transistor of the active area series-parallel width combination is M9, and the first bias resistor is R g17 , the second bias resistor is R g18 For the first series-parallel combination module in the fourth switch branch, the transistor of the active area series-parallel width combination is M10, and the first bias resistor is R g19 , the second bias resistor is R g20 For the second series-parallel combination module in the fourth switch branch, the transistor of the active area series-parallel width combination is M11, and the first bias resistor is R g21 , the second bias resistor is R g22 For the third series-parallel combination module in the fourth switch branch, the transistor of the active area series-parallel width combination is M12, and the first bias resistor is R g23 , the second bias resistor is R g24 .

[0082] Each series-parallel combination module includes transistors with the same structure and series-parallel width combination of active regions, such as Figure 2 As shown, it may include:

[0083] Equivalent series transistors and equivalent parallel transistors; where,

[0084] The source of the equivalent series transistor is used as the first end of the transistor of the active area series-parallel width combination, the gate is used as the series part control end of the transistor of the active area series-parallel width combination, and the drain is used as the second end of the transistor of the active area series-parallel width combination;

[0085] The source of the equivalent parallel transistor is connected to the drain of the equivalent series transistor, the gate serves as the parallel part control terminal of the transistor of the active area series-parallel width combination, and the drain is grounded.

[0086] In one embodiment of the present invention, the proposed transistor with active region series-parallel width combination is a gallium nitride high electron mobility field effect transistor (GaN HEMT) with active region series width and parallel width combination, and the device partial structure stereogram is shown in FIG. Figure 3 As shown. It can be understood that for the sake of convenience, Figure 3 Only the SiN passivation layer SiNpassivation of the device and the ohmic metal, gate metal and interconnect metal on the passivation layer are shown. The substrate Substrate Substrate, GaN buffer layer GaN buffer, GaN transmission layer GaN channel and AlGaN isolation layer AlGaN barrier obtained by epitaxial growth under the passivation layer are all conventional structures and are therefore not shown in the figure. Figure 3 As shown in . The embodiment of the present invention adopts the theory of traveling wave transmission, combines switches in series and parallel, adjusts the active area width Wseries of the series part and the active area width Wshunt of the parallel part to optimize the isolation performance of the switch at high frequency, and realizes high integration of series and parallel of a single device through discrete gate control; by combining electromagnetic simulation and epitaxial material design, the ratio of Wseries to Wshunt can be adjusted with high freedom and high adaptability, so as to achieve the optimization design of switch RF performance under wide bandwidth. It can be understood that the transistor with active area series-parallel width combination proposed in the embodiment of the present invention adopts the active area series width and parallel width combination, and integrates the equivalent series transistor and the equivalent parallel transistor together by reconstructing and dividing the active area where the ohmic metal is located and discretely controlling the gate strips. The embodiment of the present invention uses an equivalent series transistor and an equivalent parallel transistor to form a transistor with an active area series-parallel width combination. The use of the transistor with the active area series-parallel width combination replaces the traditional field effect transistor so that the circuit has better isolation at high frequency, and as Figure 2 As shown in the dotted line portion, the transistor is a gallium nitride radio frequency device having a series transistor and a parallel transistor. Therefore, one device used in the embodiment of the present invention replaces two devices in the traditional circuit, which greatly saves the circuit layout area and reduces the cost.

[0087] The first series-parallel combination module, the second series-parallel combination module and the third series-parallel combination module each include a series part and a parallel part.

[0088] Specifically, for each series-parallel combination module, its series connection part may include: a series transistor and a first bias resistor; and its parallel connection part may include: a parallel transistor and a second bias resistor.

[0089] The first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages, including:

[0090] By inputting the first preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the first switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the second switch branch, the third switch branch, and the fourth switch branch to turn off, so that the first switch branch of the single-pole four-throw switch circuit is turned on;

[0091] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all series-parallel combination modules in the second switch branch to be turned on, control the equivalent parallel transistors in all series-parallel combination modules in the first switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the third switch branch, and the fourth switch branch to turn off, so that the second switch branch of the single-pole four-throw switch circuit is turned on;

[0092] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL8 , control the equivalent series transistors in all series-parallel combination modules in the third switch branch to be turned on, control the equivalent parallel transistors in all series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the third switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, and the fourth switch branch to turn off, so that the third switch branch of the single-pole four-throw switch circuit is turned on;

[0093] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL7 , control the equivalent series transistors in all the series-parallel combination modules in the fourth switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL8 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the fourth switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, and the third switch branch to turn off, so that the fourth switch branch of the single-pole four-throw switch circuit is turned on;

[0094] By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7, controlling the equivalent series transistors in all series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn off, so that the single-pole four-throw switch circuit is turned off.

[0095] Specifically, the first preset voltage may include: a DC gate voltage of 0V. The second preset voltage may include: a DC gate voltage of -28V. In order to adapt to other modules in the overall circuit, the first preset voltage may be set to 0V and the second preset voltage may be set to -28V; since generally speaking, the RF PA module in the overall circuit generally sets a drain bias of 28V, the second preset voltage is set to -28V, which is equivalent to setting a reverse signal to better adapt the DC distribution of the two modules.

[0096] It can be understood that in the single-pole four-throw switch circuit, the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL4 and control voltage V CTL5 , controls the working state of the equivalent series transistors in all series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch, and controls the voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , controls the working state of the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch, when the first preset voltage is input as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 When the equivalent series transistors in all the series-parallel combination modules in the first switch branch are turned on, the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch, the third switch branch and the fourth switch branch are turned on; the second preset voltage is input as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 When the MOSFET is turned on, the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch are turned off, the equivalent series transistors in all the series-parallel combination modules in the second switch branch, the third switch branch and the fourth switch branch are turned off, the transistors M1-M3 are turned on, M4-M12 are turned off, the first switch branch of the single-pole four-throw switch circuit is turned on, and the signal is output from the first output terminal Port2 of the single-pole four-throw switch circuit.

[0097] When the first preset voltage is input as the control voltage V CTL2, control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL8 When the second switch branch is turned on, the equivalent series transistors in all the series-parallel combination modules in the second switch branch are turned on, and the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the third switch branch and the fourth switch branch are turned on; the second preset voltage is input as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL7 When the MOSFET is turned on, the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch are turned off, the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the third switch branch and the fourth switch branch are turned off, the transistors M4-M6 are turned on, M1-M3 and M7-M12 are turned off, the second switch branch of the single-pole four-throw switch circuit is turned on, and the signal is output from the second output terminal Port3 of the single-pole four-throw switch circuit.

[0098] When the first preset voltage is input as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL8 When the equivalent series transistors in all the series-parallel combination modules in the third switch branch are turned on, the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch are turned on; the second preset voltage is input as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL7 When the MOSFET is turned on, the equivalent parallel transistors in all the series-parallel combination modules in the third switch branch are turned off, the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch are turned off, transistors M7-M9 are turned on, M1-M6 and M10-M12 are turned off, the third switch branch of the single-pole four-throw switch circuit is turned on, and the signal is output from the third output terminal Port4 of the single-pole four-throw switch circuit.

[0099] When the first preset voltage is input as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL7 When the second preset voltage is input as the control voltage V CTL1 , control voltage V CTL3, control voltage V CTL5 and control voltage V CTL8 When the MOSFET is turned on, the equivalent parallel transistors in all the series-parallel combination modules in the fourth switch branch are turned off, the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch are turned off, the transistors M10-M12 are turned on, M1-M9 are turned off, the fourth switch branch of the single-pole four-throw switch circuit is turned on, and the signal is output from the fourth output terminal Port5 of the single-pole four-throw switch circuit.

[0100] When the first preset voltage is input as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 When the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch are turned on; the second preset voltage is input as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch are turned off, the transistors M1-M12 are turned off, and the single-pole four-throw switch circuit is turned off. Most of the signals of the closed switch branches are partially blocked by the equivalent series transistors, and a small amount of leakage signals are introduced into the ground by the equivalent parallel transistors, and the isolation is improved in the off state.

[0101] The simulation result diagram of the single-pole four-throw switch circuit suitable for wide-band applications provided by the embodiment of the present invention is shown in FIG. Figure 4 ,from Figure 4 It can be seen that the blue is the relationship between the frequency freq and the isolation ISO corresponding to the SP4T switch circuit of the embodiment of the present invention, and the red is the relationship between the frequency freq and the isolation ISO corresponding to the conventional circuit. It can be clearly seen that the SP4T switch circuit proposed in this application has better isolation than the conventional circuit, especially in a wide frequency band. It can be understood that for isolation, the value is negative and the larger the specific value, the higher the isolation.

[0102] In a second aspect, an embodiment of the present invention provides an electronic device, which may include the single-pole four-throw switch circuit suitable for wideband applications as provided in the first aspect. For a circuit plan layout of a single-pole four-throw switch circuit suitable for wideband applications provided by an embodiment of the present invention in an electronic device, see Figure 5 As shown, from Figure 5 It can be seen that the various components of the single-pole four-throw switch circuit are arranged in the circuit of the electronic device, and the specific circuit structure is not repeated here.

[0103] The single-pole four-throw switch circuit proposed in the embodiment of the present invention adopts multiple series-parallel combination modules to form four switch branches. By inputting the corresponding control voltage, the gate of each series-parallel combination module is controlled, thereby controlling the working state of the single-pole four-throw switch circuit. When the single-pole four-throw switch circuit is in the off state, the parallel part in the series-parallel combination module introduces the leakage signal into the ground, thereby optimizing the isolation at high frequency and being suitable for application in wide-band scenarios; further, the transistor with a series-parallel width combination in the active area in the series-parallel combination module designed by the present invention is a combination device of an equivalent series transistor and an equivalent parallel transistor. The device is used to realize the role of one device as a circuit branch, greatly saving the circuit layout area and reducing the cost.

[0104] It should be noted that in the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A single-pole four-throw switch circuit suitable for wideband applications, characterized in that: include: A first microstrip line Z1, a T-junction microstrip line Z2, a first switch branch, a second switch branch, a third switch branch and a fourth switch branch; wherein, The first end of the first microstrip line Z1 serves as the input end Port1 of the single-pole four-throw switch circuit, and the second end is connected to the input end of the T-junction microstrip line Z2; The first output end of the T-junction microstrip line Z2 is respectively connected to the input end of the first switch branch and the input end of the second switch branch, and the second output end is respectively connected to the input end of the third switch branch and the input end of the fourth switch branch; The output end of the first switch branch serves as the first output end Port2 of the single-pole four-throw switch circuit; The output end of the second switch branch serves as the second output end Port3 of the single-pole four-throw switch circuit; The output end of the third switch branch serves as the third output end Port4 of the single-pole four-throw switch circuit; The output end of the fourth switch branch serves as the fourth output end Port5 of the single-pole four-throw switch circuit; The first switch branch, the second switch branch, the third switch branch and the fourth switch branch each include a plurality of series-parallel combination modules; The first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages.

2. A single-pole four-throw switch circuit suitable for wideband applications according to claim 1, characterized in that: Any one of the first switch branch, the second switch branch, the third switch branch and the fourth switch branch comprises: a first sub-microstrip line, a first serial-parallel combination module, a second sub-microstrip line, a second serial-parallel combination module, a third sub-microstrip line, a third serial-parallel combination module and a fourth sub-microstrip line; wherein, The first end of the first sub-microstrip line serves as the input end of the corresponding switch circuit, and the second end is connected to the input end of the first series-parallel combination module; The first control voltage input terminal of the first series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the second sub-microstrip line; The second end of the second sub-microstrip line is connected to the input end of the second series-parallel combination module; The first control voltage input terminal of the second series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the third sub-microstrip line; The second end of the third sub-microstrip line is connected to the input end of the third series-parallel combination module; The first control voltage input terminal of the third series-parallel combination module is connected to the first control voltage, the second control voltage input terminal is connected to the second control voltage, and the output terminal is connected to the first end of the fourth sub-microstrip line; The second end of the fourth sub-microstrip line serves as the output end of the corresponding switch circuit.

3. A single-pole four-throw switch circuit suitable for wideband applications according to claim 2, characterized in that: Any one of the first series-parallel combination module, the second series-parallel combination module and the third series-parallel combination module comprises: Active area series-parallel width combination transistor, first bias resistor and second bias resistor; wherein, The first end of the transistor of the active area series-parallel width combination is used as the input end of the series-parallel combination module, the second end is used as the output end of the series-parallel combination module, the series part control end is connected to the first end of the first bias resistor, and the parallel part control end is connected to the first end of the second bias resistor; The second end of the first bias resistor serves as a first control voltage input end of the series-parallel combination module; The second end of the second bias resistor serves as a second control voltage input end of the series-parallel combination module.

4. A single-pole four-throw switch circuit suitable for wideband applications according to claim 3, characterized in that: The transistor with active area series-parallel width combination includes: Equivalent series transistors and equivalent parallel transistors; where, The source of the equivalent series transistor is used as the first end of the transistor of the active area series-parallel width combination, the gate is used as the series part control end of the transistor of the active area series-parallel width combination, and the drain is used as the second end of the transistor of the active area series-parallel width combination; The source of the equivalent parallel transistor is connected to the drain of the equivalent series transistor, the gate serves as the parallel part control terminal of the transistor of the active area series-parallel width combination, and the drain is grounded.

5. A single-pole four-throw switch circuit suitable for wideband applications according to claim 4, characterized in that: The first series-parallel combination module, the second series-parallel combination module and the third series-parallel combination module each include a series part and a parallel part.

6. A single-pole four-throw switch circuit suitable for wideband applications according to claim 5, characterized in that: The series connection part includes: the equivalent series transistor and the first bias resistor.

7. A single-pole four-throw switch circuit suitable for wideband applications according to claim 5, characterized in that: The parallel connection part includes: the equivalent parallel connection transistor and the second bias resistor.

8. A single-pole four-throw switch circuit suitable for wideband applications according to claim 4, characterized in that: The first switch branch, the second switch branch, the third switch branch and the fourth switch branch respectively control the working state of the single-pole four-throw switch circuit under the control of corresponding control voltages, including: By inputting the first preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the first switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the second switch branch, the third switch branch, and the fourth switch branch to turn off, so that the first switch branch of the single-pole four-throw switch circuit is turned on; By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the second switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the third switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the second switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the third switch branch, and the fourth switch branch to turn off, so that the second switch branch of the single-pole four-throw switch circuit is turned on; By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL5 and control voltage V CTL8 , control the equivalent series transistors in all the series-parallel combination modules in the third switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL6 and control voltage V CTL7 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the third switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the fourth switch branch to turn off, so that the third switch branch of the single-pole four-throw switch circuit is turned on; By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL7 , control the equivalent series transistors in all the series-parallel combination modules in the fourth switch branch to be turned on, control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch to be turned on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL8 , controlling the equivalent parallel transistors in all the series-parallel combination modules in the fourth switch branch to turn off, controlling the equivalent series transistors in all the series-parallel combination modules in the first switch branch, the second switch branch and the third switch branch to turn off, so that the fourth switch branch of the single-pole four-throw switch circuit is turned on; By inputting the first preset voltage as the control voltage V CTL2 , control voltage V CTL4 , control voltage V CTL6 and control voltage V CTL8 , control the equivalent parallel transistors in all the series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn on; input the second preset voltage as the control voltage V CTL1 , control voltage V CTL3 , control voltage V CTL5 and control voltage V CTL7 , controlling the equivalent series transistors in all series-parallel combination modules in the first switch branch, the second switch branch, the third switch branch and the fourth switch branch to turn off, so that the single-pole four-throw switch circuit is turned off.

9. An electronic device, characterized in that: The invention comprises a single-pole four-throw switch circuit suitable for wide-band applications as described in any one of claims 1 to 8.

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