Single-pole single-throw switch based on multimode resonance

Abstract

The invention provides a single-pole single-throw switch based on multimode resonance. A transmission pole and a transmission zero are generated through a multimode resonance unit. When the switch is turned on, the first loading capacitor, the first series diode and the second loading inductor generate series resonance, and a transmission pole is generated. Through parallel resonance of the first loading capacitor, the first series diode and the second loading inductor, a transmission zero point is additionally generated in a band. When the switch is turned on, a low-pass circuit is formed through the multimode resonance unit and the second parallel diode to generate a second transmission pole. The bandwidth is expanded, and the isolation degree of the switch is increased. The multi-mode resonance effect is achieved through multiplexing of the first loading capacitor, the first loading capacitor participates in series resonance in an on state and parallel resonance in an off state at the same time, and the first loading capacitor serves as a blocking capacitor to participate in direct current bias. According to the invention, excellent performance of the switch on insertion loss, isolation and bandwidth is realized, and meanwhile, miniaturization of the size is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency integrated circuit design, and particularly to a single-pole single-throw switch based on multi-mode resonance. BACKGROUND

[0002] In the field of millimeter wave technology, the design of traditional millimeter wave switches is mostly based on single-stage transistor series / parallel architecture or two-stage series-parallel transistor architecture. Specifically, the single-stage series architecture has the advantage of a wider working frequency band, but its high-frequency insertion loss is significant, and the isolation performance is weak. The single-stage parallel architecture has a narrower working frequency band, and although it can achieve smaller high-frequency insertion loss, it has higher isolation. The two-stage series-parallel architecture attempts to combine the advantages of single-stage series and single-stage parallel architectures, and compensates for the performance shortcomings of a single architecture through structural optimization. However, in practical applications, it is still difficult to simultaneously achieve low insertion loss and high isolation.

[0003] A DC-20GHz absorption type single-pole single-throw switch with the feature of including a series transistor, two parallel transistors, a series transistor, two parallel transistors, a 7-stage switch transistor structure of the series transistor, is disclosed in Chinese Patent No. 201720859921.2. The structure of multiple transistors is used to achieve high isolation and large bandwidth, and the performance is not optimized by resonance to generate zero and pole points. The overall insertion loss is more than 1dB, and the switch size is also large.

[0004] A millimeter wave single-pole single-throw switch is disclosed in Chinese Patent No. 202310820107.X, which features three switch modules, each module including a transistor and a resistor. Essentially, it is still a series-parallel transistor structure, and does not use multi-mode resonance, so it cannot simultaneously achieve low insertion loss and high isolation, and the passband isolation can only reach more than -10dB.

[0005] A millimeter wave single-pole single-throw switch is disclosed in Chinese Patent No. 202210401214.4, which features a parallel reflection structure of two parallel transistors, a series resonance structure of a transistor and a parallel inductor, and a series-parallel absorption structure of two transistors. Although a resonance is used to generate a transmission zero point in the off state to increase the isolation, the on state does not generate a transmission pole point through resonance, so the performance of insertion loss and bandwidth is general, and the overall insertion loss is greater than 1.2dB.

[0006] In summary, the disclosed single-pole single-throw switch needs to be improved in the following aspects: 1) the performance is improved only by single-series resonance or parallel resonance, without using a resonance structure to simultaneously generate series resonance and parallel resonance to optimize the performance; 2) the general structure has weak ability to realize zero-pole points, without using element multiplexing to realize multi-mode resonance function; 3) the structure using multiple transistor cascades only considers isolation, but the insertion loss is poor, generally higher than 1.2 dB, and the size is large. SUMMARY

[0007] To solve the problems in the above background art, the present application provides a single-pole single-throw switch based on multi-mode resonance, which realizes multi-mode resonance through multiplexing of a first loading capacitor, generates zero-pole points in the on and off states to realize excellent performance of the switch in insertion loss, isolation and bandwidth, and ensures miniaturization of the size. The technical solutions provided by the present application are as follows:

[0008] A single-pole single-throw switch based on multi-mode resonance, a first radio frequency port, an input matching circuit, a multi-mode resonance unit with direct current ground, an output matching circuit, and a second radio frequency port are connected in series, and a direct current control unit is connected in parallel at the connection between the multi-mode resonance unit with direct current ground and the output matching circuit.

[0009] The multi-mode resonance unit with direct current ground is composed of a first loading inductor and a parallel unit with direct current ground connected in series.

[0010] The parallel unit with direct current ground includes a first loading capacitor, a first series diode, a second loading inductor, a third shielding inductor, an input end A and an output end B; one end of the first loading capacitor is connected to the input end A, and the other end is connected to one end of the first series diode; the other end of the first series diode is connected to the output end B; one end of the second loading inductor is connected to the input end A, and the other end is connected to the output end B; one end of the third shielding inductor is connected at the connection between the first loading capacitor and the first series diode, and the other end is grounded.

[0011] The direct current control unit includes a fourth shielding inductor and a second blocking capacitor; one end of the fourth shielding inductor is connected at the connection between the multi-mode resonance unit with direct current ground and the output matching circuit, and the other end is connected to the second blocking capacitor; the other end of the second blocking capacitor is grounded; an input signal V1 is applied between the fourth shielding inductor and the second blocking capacitor.

[0012] Preferably, a second parallel diode is connected at the connection between the multi-mode resonance unit with direct current ground and the output matching circuit, and the other end of the second parallel diode is grounded.

[0013] Preferably, the input matching circuit and the output matching circuit are pure inductance, pure capacitance, or a matching circuit composed of capacitance and inductance.

[0014] Preferably, the inductors in the input matching circuit and the output matching circuit are microstrip inductors, stripline inductors, or spiral inductors.

[0015] Preferably, the capacitors in the input matching circuit and the output matching circuit are microstrip line capacitors, metal-insulator-metal capacitors, metal-oxide-metal capacitors, planar capacitors, or interdigital capacitors.

[0016] Preferably, the input signal V1 is a positive or negative level signal.

[0017] Preferably, the grounding of the diode, as well as the grounding of one end of the capacitor and inductor, are all achieved through a metallized grounding via.

[0018] A high-order single-pole single-throw switch based on multimode resonance includes n single-pole single-throw switches and n-1 coupled inductors, where n is an integer and n≥2, and the coupled inductors are connected in series between two single-pole single-throw switches.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are: a transmission pole and a transmission zero are generated through a multimode resonant unit. When the switch is turned on, the first loaded capacitor, the first series diode, and the second loaded inductor resonate in series, generating a transmission pole. Through the parallel resonance of the first loaded capacitor, the first series diode, and the second loaded inductor, an additional transmission zero is generated within the band.

[0020] When the switch is turned on, a second transmission pole is generated by forming a low-pass circuit through the multimode resonant unit and the second parallel diode. This expands the bandwidth and increases the isolation of the switch. The multimode resonance effect is achieved by reusing the first loading capacitor. The first loading capacitor participates in both the series resonance in the on-state and the parallel resonance in the off-state, and it also acts as a DC blocking capacitor in the DC bias. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the general form of the single-pole single-throw switch proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the first structure in Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the second structure in Embodiment 1 of the present invention;

[0025] Figure 4 This is a simulation curve of the relationship between scattering parameters and frequency in the conduction state of Embodiment 1 of the present invention;

[0026] Figure 5 This is a simulation curve of the relationship between scattering parameters and frequency in the off state of Embodiment 1 of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0028] Figure 7 This is a simulation curve of the relationship between scattering parameters and frequency in the conduction state of Embodiment 2 of the present invention;

[0029] Figure 8 This is a simulation curve of the relationship between scattering parameters and frequency in the off state of Embodiment 2 of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objectives, features and effects of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1: A single-pole single-throw switch based on multi-mode resonance, its general circuit form is as follows: Figure 1 As shown, the first RF port P1 and the input matching circuit X in 1. Multimode resonant unit with DC ground; 2. Output matching circuit X out The second RF port P2 is connected in series, and the DC control unit 3 is connected in parallel with the multimode resonant unit 1 with DC ground and the output matching circuit X. out The connection point.

[0034] The multimode resonant unit with DC ground is composed of a first loading inductor L1 and a parallel unit 2 with DC ground connected in series. The first loading inductor L1 can be located in the input matching circuit X. in one end (such as) Figure 2 (As shown), it can also be located in the output matching circuit X out one end (such as) Figure 3As shown in the figure, the parallel unit 2 with DC ground includes a first loading capacitor C1, a first series diode D1, a second loading inductor L2, a third emission blocking inductor L3, an input terminal A, and an output terminal B; one end of the first loading capacitor C1 is connected to the input terminal A, and the other end is connected to one end of the first series diode D1, the other end of the first series diode D1 is connected to the output terminal B; one end of the second loading inductor L2 is connected to the input terminal A, and the other end is connected to the output terminal B; one end of the third emission blocking inductor L3 is connected at the connection between the first loading capacitor C1 and the first series diode D1, and the other end is grounded.

[0035] The DC control unit 3 includes a fourth emission blocking inductor L4 and a second DC blocking capacitor C2. One end of the fourth emission blocking inductor L4 is connected to the multimode resonant unit 1 with DC ground and the output matching circuit X. out At the connection point, the other end is connected to the second DC blocking capacitor C2, and the other end of the second DC blocking capacitor C2 is grounded. An input signal V1 is applied between the fourth radio blocking inductor L4 and the second DC blocking capacitor C2. The input signal V1 is a positive or negative level signal.

[0036] The input matching circuit X in and output matching circuit X out The matching circuit can be a pure inductor, a pure capacitor, or a combination of capacitor and inductor; the input matching circuit X in and output matching circuit X out The inductor in the circuit is a microstrip line inductor, stripline inductor, or spiral inductor; the input matching circuit X in and output matching circuit X out The capacitors in the capacitors are microstrip line capacitors, metal-insulator-metal capacitors, metal-oxide-metal capacitors, parallel plate capacitors, or interdigital capacitors.

[0037] The grounding of any diode, as well as the grounding of one end of the capacitor and inductor, are all achieved through a metallized grounding via.

[0038] The first loading capacitor C1 participates in both the series resonance in the on-state and the parallel resonance in the off-state, and also acts as a DC blocking capacitor in the DC bias. When a logic level is applied, the switch is in the on-state, and the first loading capacitor C1, the first series diode D1, and the second loading inductor L1 generate a series resonance, creating a transmission pole. When an opposite logic level is applied, the switch is in the off-state, and the first loading capacitor C1, the first series diode D1, and the second loading inductor L2 generate a parallel resonance, creating a transmission zero within the band, thereby optimizing the isolation performance of the switch.

[0039] Figure 4 This is a simulation curve of the relationship between scattering parameters and frequency in the conduction state of Example 1. In the conduction state, one transmission pole is generated in the passband. Figure 5This is a simulation curve of the relationship between scattering parameters and frequency in the off state of Embodiment 1 of the present invention; in the off state, a transmission zero is generated in the band through multimode resonance.

[0040] Example 2: Figure 6 As shown, based on Embodiment 1, the multimode resonant unit 1 with DC ground and the output matching circuit X are... out The connection point is connected to a second parallel diode D2, and the other end of the second parallel diode D2 is grounded.

[0041] In the on state, the added second parallel diode D2 forms a low-pass circuit, generating a second transmission pole, thereby increasing isolation and improving bandwidth.

[0042] Figure 7 This is a simulation curve of the relationship between scattering parameters and frequency in the conduction state of Example 2. In the conduction state, two transmission poles are generated in the passband, which optimizes the in-band performance and expands the bandwidth. The insertion loss is less than 1dB and the return loss is greater than 20dB. Figure 8 This is a simulation curve of the relationship between scattering parameters and frequency in the off state of Example 2. In the off state, a transmission zero is generated in the band through multimode resonance, which optimizes the isolation performance of the switch and the overall isolation is greater than 17dB.

[0043] Example 3: Connect n multimode resonant units 1 with DC ground and n-1 coupled inductors in series, and achieve multimode resonance by reusing the first loading capacitor C1 to optimize in-band performance. Figure 9 One example is given (n=2), such as Figure 9 As shown, a high-order single-pole single-throw switch based on multimode resonance includes a first RF port P1 and an input matching circuit X. in The components include: a first multimode resonant unit with DC ground, a DC control unit 3, a second parallel diode D2, a fifth coupling inductor L5, a third parallel diode D3, a second multimode resonant unit with DC ground, and an output matching circuit X. out Second radio frequency port P2.

[0044] Compared to Embodiment 2, Embodiment 3 has a multimode resonant unit with DC ground and an output matching circuit X. outA fifth coupling inductor L5, a third parallel diode D3, and a second multimode resonant unit with DC ground were added. Specifically: one end of the eighth loading inductor L8 is connected to the second RF port P2, and the other end is connected to the third loading capacitor C3. The other end of the third loading capacitor C3 is connected to the connection point between one end of the fourth series diode D4 and the seventh emission isolation inductor L7. The other end of the seventh loading inductor L7 is grounded. The other end of the fourth series diode D4 is connected to the sixth loading inductor L6. The other end of the sixth loading inductor L6 is connected to the connection point between the third loading capacitor C3 and the eighth loading inductor L8. One end of the fifth coupling inductor L5 is connected to the connection point between the first series diode D1 and the second loading inductor L2, and the other end is connected to the connection point between the fourth series diode D4 and the sixth loading inductor L6. One end of the third parallel diode D3 is connected to the connection point between the fifth coupling inductor L5 and the fourth series diode D4, and the other end is grounded.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A single-pole single-throw switch based on multi-mode resonance, characterized in that, The first RF port, the input matching circuit, the multimode resonant unit with DC ground, the output matching circuit, and the second RF port are connected in series in sequence, and the DC control unit is connected in parallel at the connection between the multimode resonant unit with DC ground and the output matching circuit. The multimode resonant unit with DC ground is composed of a first loaded inductor and a parallel unit with DC ground connected in series. The parallel unit with DC ground includes a first loading capacitor, a first series diode, a second loading inductor, a third emission blocking inductor, an input terminal A, and an output terminal B; one end of the first loading capacitor is connected to the input terminal A, and the other end is connected to one end of the first series diode, the other end of the first series diode is connected to the output terminal B; one end of the second loading inductor is connected to the input terminal A, and the other end is connected to the output terminal B; one end of the third emission blocking inductor is connected at the connection between the first loading capacitor and the first series diode, and the other end is grounded. The DC control unit includes a fourth radio blocking inductor and a second DC blocking capacitor. One end of the fourth radio blocking inductor is connected to the connection point of the multimode resonant unit with DC ground and the output matching circuit, and the other end is connected to the second DC blocking capacitor. The other end of the second DC blocking capacitor is grounded. An input signal V1 is applied between the fourth radio blocking inductor and the second DC blocking capacitor.

2. A single-pole single-throw switch based on multi-mode resonance according to claim 1, characterized in that, A second parallel diode is connected at the connection point between the multimode resonant unit with DC ground and the output matching circuit, and the other end of the second parallel diode is grounded.

3. A single-pole single-throw switch based on multi-mode resonance according to claim 1, characterized in that, The input matching circuit and the output matching circuit are matching circuits composed of pure inductance, pure capacitance, or a combination of capacitance and inductance.

4. A single-pole single-throw switch based on multimode resonance according to claim 1, characterized in that, The inductors in the input matching circuit and the output matching circuit are microstrip inductors, stripline inductors, or spiral inductors.

5. A single-pole single-throw switch based on multimode resonance according to claim 1, characterized in that, The capacitors in the input matching circuit and the output matching circuit are microstrip line capacitors, metal-insulator-metal capacitors, metal-oxide-metal capacitors, planar capacitors, or interdigital capacitors.

6. A single-pole single-throw switch based on multimode resonance according to claim 1, characterized in that, The input signal V1 is a positive or negative level signal.

7. A single-pole single-throw switch based on multimode resonance according to claim 2, characterized in that, The grounding of diodes, as well as the grounding of one end of capacitors and inductors, are all achieved through metallized grounding vias.

8. A high-order single-pole single-throw switch based on multimode resonance, characterized in that, It includes n single-pole single-throw switches based on multimode resonance as described in claim 1 or 2 and n-1 coupled inductors, where n is an integer and n≥2, and the coupled inductors are connected in series between two single-pole single-throw switches.

9. A single-pole multi-throw switch based on multi-mode resonance, characterized in that, Including a single-pole single-throw switch based on multimode resonance as described in any one of claims 1-7.

10. A radio frequency front-end circuit, characterized in that, Including a single-pole single-throw switch based on multimode resonance as described in any one of claims 1-7.

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