High-precision phase shifter and communication equipment

Abstract

The invention provides a high-precision phase shifter and communication equipment, and relates to the technical field of integrated circuits, the high-precision phase shifter comprises an inductance circuit and a capacitance circuit connected with the inductance circuit, the inductance circuit comprises a differential inductor with a tap, and the tap of the differential inductor is connected with the capacitance circuit; the capacitor circuit comprises a plurality of capacitor branches which are connected in parallel; each capacitor branch comprises a control switch and a capacitor connected with the control switch; and the control switch is used for responding to the control signal and controlling the on-off state of the capacitor branch based on the control signal, so that the high-precision phase shifter is switched between the reference state and the phase shifting state. According to the high-precision phase shifter and the communication equipment, accurate phase shifting can be achieved by changing the on-off state and the parameters of the capacitor, the phase shifting error of the high-precision phase shifter along with frequency response is reduced, and the high-precision phase shifter is simple in overall circuit structure, flexible to adjust, insensitive to the influence of the technology and temperature, wide in application scene and suitable for popularization and application. And the use requirements can be effectively met.

Description

Technical Field

[0001] The present invention relates to the technical field of integrated circuits, and more particularly to a high-precision phase shifter and a communication device. Background Art

[0002] A phase shifter is a device that controls the phase change of a signal, appropriately shifts or delays the signal phase to meet the system's requirements for signal amplitude and phase control, thereby realizing functions such as signal beamforming or beam scanning. It is widely used in satellite communication, radar systems, as well as microwave communication and measurement systems. The phase shift accuracy and amplitude modulation error of the phase shifter directly affect the performance and stability of the system.

[0003] Generally, a phase shifter uses inductors, capacitors, or active devices (operational amplifiers) to form a phase shift network, realizes phase shift by changing circuit parameters, and ensures consistent phase shift characteristics within a wide frequency range.

[0004] The passive high-pass and low-pass phase shifter structure using inductors and capacitors is widely used due to its low power consumption and high linearity. However, due to the presence of inductors and capacitors in the passive devices of the high-pass and low-pass branches, it often results in a large layout area; and switches are required to switch between the high-pass and low-pass branches, which directly leads to a high insertion loss of the phase shifter structure; in addition, the performance of the phase shifter is very sensitive to the impedance matching between sub-units and it is difficult to meet the usage requirements. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a high-precision phase shifter and a communication device to alleviate the above technical problems.

[0006] In a first aspect, an embodiment of the present invention provides a high-precision phase shifter, where the high-precision phase shifter includes: an inductor circuit, and a capacitor circuit connected to the inductor circuit, and the inductor circuit and the capacitor circuit form a filter; wherein, the inductor circuit includes a tapped differential inductor, and the tap of the differential inductor is connected to the capacitor circuit; the capacitor circuit includes a plurality of capacitor branches connected in parallel; one end of the capacitor branches connected in parallel is connected to the tap of the differential inductor, and the other end is grounded; each capacitor branch includes a control switch and a capacitor connected to the control switch; the control switch is configured to respond to a control signal and control the on / off state of the capacitor branch based on the control signal, so that the high-precision phase shifter switches between a reference state and a phase shift state.

[0007] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect. Among them, the above-mentioned high-precision phase shifter further includes an amplitude modulation circuit connected in parallel with the capacitance circuit; one end of the amplitude modulation circuit is connected to the tap of the differential inductor, and the other end is grounded; the amplitude modulation circuit is used to reduce the parasitic amplitude modulation of the high-precision phase shifter.

[0008] In combination with the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect. Among them, the above-mentioned amplitude modulation circuit includes an amplitude modulation resistor and a control switch connected in series with the amplitude modulation resistor; the control switch of the amplitude modulation circuit is a control switch composed of MOS transistors, and the gate of the MOS transistor is used to respond to a control signal to adjust the parasitic amplitude modulation of the high-precision phase shifter.

[0009] In combination with the first possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect. Among them, each of the above-mentioned capacitance branches includes two capacitors connected in series, and the two capacitors are respectively arranged on both sides of the control switch.

[0010] In combination with the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect. Among them, the above-mentioned capacitance branch includes a first capacitance branch, and the control switch of the first capacitance branch is in a conducting state.

[0011] In combination with the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect. Among them, the above-mentioned capacitance branch further includes a second capacitance branch and at least one third capacitance branch; the control signal of the control switch of the second capacitance branch and the control signal of the control switch of the third capacitance branch satisfy a pre-configured control logic to change the phase shift accuracy of the high-precision phase shifter.

[0012] In combination with the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect. Among them, in the reference state, the control switch of the first capacitance branch is in a conducting state; the control switches of the second capacitance branch and the third capacitance branch are in a disconnected state; in the phase shift state, the control switch of the first capacitance branch is in a conducting state; the control switch of the second capacitance branch is in a conducting state, and the control switch of the third capacitance branch conducts or disconnects according to the pre-configured control logic.

[0013] In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect. Among them, in the reference state, the control switch of the amplitude modulation circuit is in a conducting state; in the phase shift state, the control switch of the amplitude modulation circuit is in a disconnected state.

[0014] Combined with the first aspect, or the first possible implementation manner of the first aspect, the embodiments of the present invention provide an eighth possible implementation manner of the first aspect, wherein the control switch is a control switch composed of MOS transistors; the gates of the MOS transistors are used to respond to the control signal.

[0015] In a second aspect, the embodiments of the present invention further provide a communication device, and the communication device is configured with the high-precision phase shifter described in the first aspect.

[0016] The embodiments of the present invention bring the following beneficial effects:

[0017] A high-precision phase shifter and a communication device provided by the embodiments of the present invention include an inductance circuit and a capacitance circuit connected to the inductance circuit in the high-precision phase shifter, and the inductance circuit and the capacitance circuit form a filter; wherein, the inductance circuit includes a tapped differential inductance, and the tap of the differential inductance is connected to the capacitance circuit; the capacitance circuit includes a plurality of capacitively coupled capacitor branches; one end of the capacitively coupled capacitor branches is connected to the tap of the differential inductance, and the other end is grounded; each capacitor branch includes a control switch and a capacitor connected to the control switch; the control switch is used to respond to a control signal and control the on-off state of the capacitor branch based on the control signal, so that the high-precision phase shifter can switch between a reference state and a phase-shifted state. For the above capacitor branch, by changing the on-off state and the parameters of the capacitor, a relatively accurate phase shift can be achieved, and the phase shift error of the high-precision phase shifter with frequency response can be effectively reduced. Moreover, the overall circuit structure is simple, the adjustment is flexible, it is not sensitive to the influence of process and temperature, and the usage scenario is wide, which can effectively meet the usage requirements.

[0018] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings.

[0019] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0020] In order to more clearly illustrate the specific implementation manners of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific implementation manners or the prior art. Obviously, the following drawings are some implementation manners of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1Block diagram of a high-precision phase shifter provided by an embodiment of the present invention;

[0022] Figure 2 Schematic circuit diagram of a high-precision phase shifter provided by an embodiment of the present invention;

[0023] Figure 3 Schematic equivalent circuit diagram in a reference state provided by an embodiment of the present invention;

[0024] Figure 4 Schematic equivalent circuit diagram in a phase-shifted state provided by an embodiment of the present invention;

[0025] Figure 5 Phase curve provided by an embodiment of the present invention. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In current phase shifters, due to the presence of passive devices such as inductors and capacitors, they have a large layout area; and high- and low-pass branches need to be switched by switches, which directly results in a high insertion loss of the phase shifter structure; in addition, the performance of the phase shifter is also very sensitive to the impedance matching between sub-units.

[0028] Based on this, an embodiment of the present invention provides a high-precision phase shifter and a communication device to alleviate the above technical problems.

[0029] To facilitate the understanding of this embodiment, a high-precision phase shifter and a communication device disclosed in the embodiments of the present invention will be introduced in detail first.

[0030] In a possible implementation manner, an embodiment of the present invention provides a high-precision phase shifter, which can be applied to a phase shifter circuit unit in a millimeter-wave beamforming RF chip, and a phase shifter circuit structure that requires high-precision phase shifting and is suitable for broadband in other integrated circuits.

[0031] Specifically, the high-precision phase shifter in the embodiment of the present invention includes: an inductor circuit, and a capacitor circuit connected to the inductor circuit, and the inductor circuit and the capacitor circuit form a filter.

[0032] Among them, for the convenience of understanding, Figure 1 shows a block diagram of a high-precision phase shifter, including an inductor circuit 10 and a capacitor circuit 20.

[0033] Among them, the inductance circuit includes a tapped differential inductor, and the tap of the differential inductor is connected to the capacitance circuit; the capacitance circuit includes a plurality of capacitively coupled capacitor branches; one end of the capacitively coupled capacitor branches is connected to the tap of the differential inductor, and the other end is grounded; for the sake of easy understanding, Figure 1 also shows a plurality of capacitor branches 201.

[0034] Furthermore, each capacitor branch includes a control switch and a capacitor connected to the control switch; the control switch is used to respond to a control signal and control the on-off state of the capacitor branch based on the control signal, so that the high-precision phase shifter can switch between a reference state and a phase-shifted state.

[0035] The high-precision phase shifter provided by the embodiment of the present invention includes an inductance circuit and a capacitance circuit connected to the inductance circuit in the high-precision phase shifter, and the inductance circuit and the capacitance circuit form a filter; among them, the inductance circuit includes a tapped differential inductor, and the tap of the differential inductor is connected to the capacitance circuit; the capacitance circuit includes a plurality of capacitively coupled capacitor branches; one end of the capacitively coupled capacitor branches is connected to the tap of the differential inductor, and the other end is grounded; each capacitor branch includes a control switch and a capacitor connected to the control switch; the control switch is used to respond to a control signal and control the on-off state of the capacitor branch based on the control signal, so that the high-precision phase shifter can switch between a reference state and a phase-shifted state. For the above capacitor branch, by changing the on-off state and the parameters of the capacitor, a relatively accurate phase shift can be achieved, and the phase shift error of the high-precision phase shifter with frequency response is effectively reduced. Moreover, the overall circuit structure is simple, the adjustment is flexible, it is not sensitive to the influence of process and temperature, and the usage scenario is wide, which can effectively meet the usage requirements.

[0036] In actual use, the above inductance circuit and capacitance circuit can form an LCL structure, and moreover, the high-precision phase shifter in the embodiment of the present invention can also be provided with an amplitude modulation circuit to achieve a smaller parasitic amplitude modulation effect.

[0037] Therefore, the high-precision phase shifter in the embodiment of the present invention further includes an amplitude modulation circuit connected in parallel with the capacitance circuit; one end of the amplitude modulation circuit is connected to the tap of the differential inductor, and the other end is grounded; and the amplitude modulation circuit is used to reduce the parasitic amplitude modulation of the high-precision phase shifter.

[0038] For the sake of easy understanding, on the basis of Figure 1 the embodiment of the present invention also provides a circuit schematic diagram of a high-precision phase shifter. As shown in Figure 2 L1 is a tapped differential inductor. At the same time, the inductor and the capacitor in the capacitance circuit form a low-pass filter, where Figure 2 it is described by taking the capacitance circuit including four parallel capacitor branches as an example. And Figure 2Among them, L1 serves as the series inductor in the low-pass filter, and capacitors C0, C1, C1_1, and C1_0 are the capacitors of each capacitor branch, and, serves as the parallel capacitor of the low-pass filter.

[0039] Furthermore, the amplitude modulation circuit in the embodiment of the present invention includes an amplitude modulation resistor, and a control switch connected in series with the amplitude modulation resistor, and the control switch of the amplitude modulation circuit is a control switch composed of MOS transistors, such as Figure 2 shown, R1 is the amplitude modulation resistor, M2 is the control switch of the amplitude modulation resistor R1, and, Figure 2 the gate of the MOS transistor M2 in is used to respond to the control signal to adjust the parasitic amplitude modulation of the high-precision phase shifter.

[0040] Furthermore, the control switch of each of the above capacitor branches is also a control switch composed of MOS transistors; the gate of the MOS transistor is used to respond to the control signal. For example, taking Figure 2 as an example, MOS transistors M0, M1, M1_1, and M1_0 are the control switches of capacitors C0, C1, C1_1, and C1_0 respectively, and, in the embodiment of the present invention, each capacitor branch includes two capacitors connected in series, and, these two capacitors are respectively arranged on both sides of the control switch, which not only increases the symmetry between the source and drain ends of the switch but also facilitates the realization of small capacitors in the millimeter-wave frequency band.

[0041] Furthermore, the above capacitor branch in the embodiment of the present invention includes a first capacitor branch, and the control switch of the first capacitor branch is in the on state. Further, the above capacitor branch also includes a second capacitor branch and at least one third capacitor branch; wherein, the control signal of the control switch of the second capacitor branch and the control signal of the control switch of the third capacitor branch satisfy a pre-configured control logic to change the phase shift accuracy of the high-precision phase shifter. That is, the phase shift accuracy of the high-precision phase shifter in the embodiment of the present invention is realized by changing the on-off states of the above first capacitor branch, second capacitor branch, and third capacitor branch.

[0042] Among them, taking Figure 2 as an example, assuming that the capacitor branch where capacitor C0 is located is the first capacitor branch, at this time, the control switch represented by MOS transistor M0 is the control switch of the first capacitor branch, and this MOS transistor M0 can be controlled by the high level vdd and is always in the on state.

[0043] Furthermore, assuming Figure 2 in, the capacitor branch where capacitor C1 is located is the second capacitor branch, and the capacitor branches where capacitors C1_1 and C1_0 are located in the dotted box are the third capacitor branches. At this time, the MOS transistors M1, M1_1, and M1_0 of the second capacitor branch and the third capacitor branch are all controlled by or its inverse signal, and, and are related to Meet the pre-configured control logic. For example, the control signal can be configured and is the 2-bit control signal after performing a logical "AND" operation with . At this time, the on / off states of the branches of capacitors C1_1 and C1_0 can be controlled by this 2-bit control signal. Further, the VIN and VOUT in the above Figure 2 are the signal input and output terminals of the single-ended circuit; for the differential link, it can be implemented by consisting of two single-ended circuits

[0044] Further Figure 2 , in , the two inductors L1 are designed as tapped differential inductors in the layout, with a total inductance of 2*L1. The taps of the differential inductor are connected to the parallel capacitors C0, C1, C1_1, C1_0, and the amplitude modulation resistor R1, which not only saves the layout area but also facilitates the layout of inductors, capacitors, and active MOS transistors

[0045] Further, in the embodiment of the present invention, in the reference state, the control switch of the first capacitor branch is in the on state; the control switches of the second capacitor branch and the third capacitor branch are in the off state; in the phase shift state, the control switch of the first capacitor branch is in the on state; the control switch of the second capacitor branch is in the on state, and the control switch of the third capacitor branch conducts or disconnects according to the pre-configured control logic

[0046] Moreover, in the reference state, the control switch of the amplitude modulation circuit is in the on state; in the phase shift state, the control switch of the amplitude modulation circuit is in the off state

[0047] For ease of understanding Figure 3 also shows an equivalent circuit diagram in the reference state, and Figure 4 shows an equivalent circuit diagram in the phase shift state

[0048] Specifically, in the reference state of the high-precision phase shifter, it is possible to control , that is, a low-level signal. At this time Figure 3 , in , R M0 is the on-resistance of MOS transistor M0, C1' is the equivalent capacitance of the branches of capacitors C1, C1_1, C1_0, and R1' is the equivalent resistance of the amplitude modulation circuit

[0049] Further Figure 4 represents the equivalent circuit when Vφ = 1, that is, a high-level signal, where Figure 4 , the R M0 in is the on-resistance of MOS transistor M0, R M1 is the on-resistance of MOS transistor M1, C1” is the equivalent capacitance of the branches of capacitors C1, C1_1, C1_0, C M2It is the turn-off parasitic capacitance of MOS transistor M2.

[0050] Generally, the phase shift amount of the phase shifter is the phase of the circuit in the phase shift state minus the phase of the reference state, which is a relative quantity. The main means to achieve the phase difference is to design different parameter values of the parallel capacitor C in the LCL structure in the reference state and the phase shift state to achieve phase shift. However, the low-pass LCL structure is usually applicable to the narrowband range. For the broadband operating frequency range, the frequency response curve of the relative phase shift is not flat, and there will be a large difference in the phase shift between high and low frequencies. To solve this problem, the phase shift state capacitor can be made into a trimable array, that is, as shown in the dotted box in the embodiment of the present invention, that is, the third capacitor branch in the embodiment of the present invention actually realizes a trimable array. Figure 2 That is, as shown by the dotted box in the embodiment of the present invention, that is, the third capacitor branch in the embodiment of the present invention actually realizes a trimable array.

[0051] At this time, Figure 2 For the high-precision phase shifter shown, the capacitor is made 2-bit adjustable in the phase shift state, and according to different frequency bands, 4-gear capacitance value trimming in the phase shift state can be realized, so that the high-precision phase shifter can have a small phase shift error throughout the frequency band when operating in the broadband. In addition, in the above, the presence of the amplitude modulation circuit where the amplitude modulation resistor R1 is located also effectively reduces the parasitic amplitude modulation effect brought about when the high-precision phase shifter works. By designing the appropriate resistance value of R1, the amplitude curve of the reference state can be effectively changed, so as to achieve an amplitude curve with the same trend as the phase shift state, and further realize a small parasitic amplitude modulation effect. Figure 2 In the above, the presence of the amplitude modulation circuit where the amplitude modulation resistor R1 is located also effectively reduces the parasitic amplitude modulation effect brought about when the high-precision phase shifter works. By designing the appropriate resistance value of R1, the amplitude curve of the reference state can be effectively changed, so as to achieve an amplitude curve with the same trend as the phase shift state, and further realize a small parasitic amplitude modulation effect.

[0052] Furthermore, for the sake of easy understanding, the following is based on Figures 2 to 4 , to further illustrate the high-precision phase shifter provided by the embodiment of the present invention, where Figure 2 The MOS transistor in

[0053] As Figure 2 shown, generally, C0 is a fixed capacitor, and this branch is always in the always-on state, that is, the control switch of the above-mentioned first capacitor branch in the embodiment of the present invention is in the on state. Capacitors C1, C1_1, and C1_0 are capacitors in the phase shift state, and R1 is an amplitude modulation compensation resistor in the reference state, that is, an amplitude modulation resistor.

[0054] In the reference state, assuming that the control signal MOS transistors M1, M1_1, and M1_0 are in the off state, and MOS transistor M2 is in the on state. The equivalent circuit diagram at this time is as Figure 3 shown, and the equivalent capacitor C1' at this time is the equivalent capacitor of the three branches where C1, C1_1, and C1_0 are located, and can be expressed as

[0055]

[0056] In the above formula, / / represents parallel operation, and C M1 , C M1_1 , C M1_0 are the equivalent capacitances when the MOS transistors M1, M1_1, and M1_0 are turned off (i.e., in the open state), respectively. Usually, the MOS transistor size is small. Therefore, So, the above C1' can be simplified to:

[0057] C1′≈C M1 +C M1_1 +C M1_0 .

[0058] Furthermore, in the reference state, the MOS transistor M2 is in the conducting state. At this time, the amplitude modulation circuit where R1 is located is conducting. Therefore, R1′ = R1 + R M2 , where R M2 is the on-resistance of the MOS transistor M2.

[0059] Furthermore, in the phase shift state, the MOS transistor M1 is in the conducting state, M2 is in the open state, and M1_1 and M1_0 can configure the control logic according to the phase shift requirements of different frequency bands, and then control them to be in the conducting state or the open state. Therefore, the equivalent capacitance at this time is expressed as:

[0060]

[0061] where ΔC is the total capacitance of the two branches of the capacitances C1_1 and C1_0, and its value can be flexibly adjusted by the MOS transistors M1_1 and M1_0.

[0062] Usually, for a low-pass LCL structure, the phase shift degree can be expressed as θ = arcsin(2πf*C*Z L ), where f is the operating frequency, C is the total parallel capacitance value, and Z L is the characteristic impedance, and the phase is the lagging phase. Therefore, in the phase shift state, the conduction or disconnection of the switches M1_1 and M1_0 can be controlled according to different frequencies, so as to trim to an appropriate capacitance value to ensure that the phase shift amounts at each frequency point within the broadband range can all be kept the same.

[0063] Furthermore, Figure 5 a phase curve is also shown, where, Figure 5 in, the dashed line is the phase curve in the phase shift state without the two trim branches C1_1 and C1_0, and its phase shift amount in the frequency range of 17 GHz to 22 GHz is while after adding the two branches C1_1 and C1_0, the phase curve in the phase shift state becomes the sawtooth curve in Figure 3 , and its phase shift amount in the frequency range of 17 GHz to 22 GHz is

[0064] From Figure 5 it can be clearly observed that the fluctuation range is much smaller than that of , so that good phase shift accuracy is still maintained within the broadband. This structure is an implementation manner of 2-bit adjustable. In actual use, more branch topologies can be designed according to different usage scenarios, with more bit trim gears, and higher-precision phase shift can be achieved in a wider frequency band. Specifically, it can be set according to the actual usage situation, and the embodiments of the present invention do not limit this.

[0065] In summary, the high-precision phase shifter provided by the embodiments of the present invention can achieve high-precision phase shift within a broadband through a simple LCL structure, and compensates for the amplitude modulation resistance in the circuit, thereby achieving a small parasitic amplitude modulation effect. This enables this circuit to have a relatively wide range of usage scenarios. This circuit adjustment method is flexible and practical, can achieve multi-bit and high-precision regulation, and has low power consumption and high stability.

[0066] Furthermore, on the basis of the above embodiments, the embodiments of the present invention also provide a communication device configured with the above high-precision phase shifter.

[0067] The communication device provided by the embodiments of the present invention has the same technical features as the high-precision phase shifter provided by the above embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0068] The computer program product of the high-precision phase shifter and communication device provided by the embodiments of the present invention includes a computer-readable storage medium storing program code, and the instructions included in the program code can be used to execute the methods described in the previous embodiments. For specific implementation, reference can be made to the previous embodiments, and details are not described herein again.

[0069] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the communication device described above can refer to the corresponding process in the previous embodiments, and details are not described herein again.

[0070] In addition, in the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0071] When the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0072] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] Finally, it should be noted that the above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A high-precision phase shifter, characterized in that, The high-precision phase shifter includes: an inductance circuit, and a capacitance circuit connected to the inductance circuit, and the inductance circuit and the capacitance circuit form a filter; Wherein, the inductance circuit includes a tapped differential inductor, and the tap of the differential inductor is connected to the capacitance circuit; The capacitance circuit includes a plurality of capacitively connected capacitor branches; one end of the capacitively connected capacitor branches is connected to the tap of the differential inductor, and the other end is grounded; Each capacitor branch includes a control switch and a capacitor connected to the control switch; The control switch is configured to respond to a control signal and control the on / off state of the capacitor branch based on the control signal, so that the high-precision phase shifter switches between a reference state and a phase-shifted state.

2. The high-precision phase shifter according to claim 1, wherein The high-precision phase shifter further includes an amplitude modulation circuit connected in parallel with the capacitance circuit; One end of the amplitude modulation circuit is connected to the tap of the differential inductor, and the other end is grounded; The amplitude modulation circuit is used to reduce the parasitic amplitude modulation of the high-precision phase shifter.

3. The high-precision phase shifter according to claim 2, wherein The amplitude modulation circuit includes an amplitude modulation resistor and a control switch connected in series with the amplitude modulation resistor; The control switch of the amplitude modulation circuit is a control switch composed of a MOS transistor, and the gate of the MOS transistor is configured to respond to a control signal to adjust the parasitic amplitude modulation of the high-precision phase shifter.

4. The high-precision phase shifter according to claim 2, wherein Each capacitor branch includes two capacitors connected in series, and the two capacitors are respectively arranged on both sides of the control switch.

5. The high-precision phase shifter according to claim 4, characterized in that The capacitor branch includes a first capacitor branch, and the control switch of the first capacitor branch is in an on state.

6. The high-precision phase shifter according to claim 5, characterized in that, The capacitor branch further includes a second capacitor branch and at least one third capacitor branch; The control signal of the control switch of the second capacitor branch and the control signal of the control switch of the third capacitor branch satisfy a pre-configured control logic to change the phase-shifting accuracy of the high-precision phase shifter.

7. The high-precision phase shifter according to claim 6, characterized in that In the reference state, the control switch of the first capacitor branch is in an on state; the control switches of the second capacitor branch and the third capacitor branch are in an off state; In the phase-shifted state, the control switch of the first capacitor branch is in an on state; the control switch of the second capacitor branch is in an on state, and the control switch of the third capacitor branch is turned on or off according to the pre-configured control logic.

8. The high-precision phase shifter according to claim 3, wherein, In the reference state, the control switch of the amplitude modulation circuit is in an on state; In the phase-shifted state, the control switch of the amplitude modulation circuit is in an off state.

9. The high-precision phase shifter according to claim 1 or 2, characterized in that, The control switch is a control switch composed of a MOS transistor; The gate of the MOS transistor is configured to respond to the control signal.

10. A communication device, characterized in that, The communication device is configured with the high-precision phase shifter according to any one of claims 1 to 9.

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