Phase shifter circuit and multi-phase shifter circuit

Abstract

The utility model relates to the technical field of radio frequency integrated circuits, in particular to a phase shifter circuit and a multi-phase shifter circuit, which comprise an input node, an output node, a first signal path and a second signal path, the first signal path comprises a first switch, a second switch and a decoupling structure, the decoupling structure comprises a first inductor, a second inductor and a third inductor, the first inductor and the second inductor are connected in series, one end of the third inductor is connected to a connecting line node of the first inductor and the second inductor, and the other end of the third inductor is grounded; the second end of the second inductor is connected to the second switch; the second signal path includes a third switch, a fourth switch, and an anti-coupling transformer. The phase shifter circuit provided by the utility model solves the technical problem of poor phase flatness of a phase shift unit in a traditional phase shifter, improves the phase flatness, has broadband operating characteristics and low insertion loss, and reduces the chip area of the phase shifter circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency integrated circuits, in particular to a phase shifter circuit and a multi-phase shifter circuit. Background Art

[0002] With the continuous development of radio frequency and broadband wireless communication, broadband phased array as its key component has received more and more attention. Phase shifter usually plays a very critical role in phased array system. It is mainly used to generate a relatively constant phase difference to achieve electronic beam forming and scanning.

[0003] The phase shift can vary anywhere between 0 and 360 degrees, with 180 degrees of phase shift (the phase shifter provides two output phases with a phase difference of 180 degrees) being the largest phase shift unit. As the degree of phase shift increases, the area of ​​the phase shift unit and the insertion loss also increase accordingly.

[0004] In the prior art CN216794962U patent, for the phase shifter circuit, for its positive coupling transformer, in the actual layout, a high coupling coefficient requires the primary coil and the secondary coil to be tightly wound, which often brings about a large parasitic capacitance that affects the phase flatness. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a phase shifter circuit, which solves the technical problem of poor phase flatness of the phase shift unit in the traditional phase shifter, improves the phase flatness, has broadband working characteristics and low insertion loss, and reduces the chip area of ​​the phase shifter circuit.

[0006] The utility model provides a phase shifter circuit, comprising an input node, an output node, a first signal path and a second signal path, wherein the first signal path and the second signal path are connected in parallel between the input node and the output node, and a control signal responded by the first signal path is inversely proportional to a control signal responded by the second signal path;

[0007] The first signal path includes a first switch connected to the input node, a second switch connected to the output node, and a decoupling structure connected between the first switch and the second switch;

[0008] The second signal path includes a third switch connected to the input node, a fourth switch connected to the output node, and an anti-coupling transformer connected between the third switch and the fourth switch;

[0009] The decoupling structure includes a first inductor and a second inductor connected in series, and a third inductor having one end connected to a connection node between the first inductor and the second inductor and the other end grounded, the first end of the first inductor is connected to the first switch, and the second end of the second inductor is connected to the second switch.

[0010] A further improvement of the phase shifter circuit of the utility model is that the reverse coupling transformer includes a fourth inductor having one end connected to the third switch and the other end grounded, and a fifth inductor having one end connected to the fourth switch and the other end grounded, and the fourth inductor is reversely coupled to the fifth inductor through a coupling factor K2.

[0011] A further improvement of the phase shifter circuit of the utility model is that the first signal path further includes a first capacitor connected in parallel to the first inductor and the third inductor and a second capacitor connected in parallel to the second inductor and the third inductor;

[0012] The second signal path further includes a third capacitor connected in parallel to the fourth inductor and a fourth capacitor connected in parallel to the fifth inductor.

[0013] A further improvement of the phase shifter circuit of the present invention is that the first signal path further includes a fifth capacitor bridged to the decoupling structure, and the second signal path further includes a sixth capacitor bridged to the anti-coupling transformer.

[0014] A further improvement of the phase shifter circuit of the utility model is that the first signal path further includes a fifth switch connected in parallel to the first inductor and the third inductor and a sixth switch connected in parallel to the second inductor and the third inductor;

[0015] The second signal path further includes a seventh switch connected in parallel to the fourth inductor and an eighth switch connected in parallel to the fifth inductor.

[0016] A further improvement of the phase shifter circuit of the present invention is that the first signal path further includes a seventh capacitor bridged to the decoupling structure, and the second signal path further includes an eighth capacitor bridged to the anti-coupling transformer.

[0017] A further improvement of the phase shifter circuit of the utility model is that the first inductor, the second inductor and the third inductor in the decoupling structure have a set angle and a set overlapping area.

[0018] A further improvement of the phase shifter circuit of the present invention lies in that at least one of the first switch or the second switch includes one or more field effect transistors (FETs).

[0019] A further improvement of the phase shifter circuit of the utility model is that the phase shifter circuit is a 180-degree phase shifter circuit.

[0020] A multi-phase shifter circuit comprises a plurality of the phase shifter circuits as described above, wherein the plurality of the phase shifter circuits are connected in series.

[0021] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0022] (1) Based on the decoupling structure and the principle that the phase difference of the anti-coupling transformer is 180 degrees, the physical size of the phase shifter circuit is greatly reduced, and broadband working characteristics can be achieved;

[0023] (2) By decoupling the existing positive coupling transformer, the problem of phase flatness degradation caused by the parasitic capacitance between the primary coil and the secondary coil is reduced, thereby improving the phase shifting performance of the phase shifter;

[0024] (3) By combining the decoupling structure with the anti-coupling transformer, the parasitic resistance between the inductor and the trace is reduced compared to the general transformer phase-shifting circuit, which can achieve lower insertion loss and amplitude error and improve link performance;

[0025] (4) The phase shifter circuit reduces the waste of chip area and reduces the size of the chip.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of a phase shifter circuit provided by the utility model.

[0029] Figure 2 is a schematic diagram of a phase shifter circuit in the prior art.

[0030] Figure 3 It is a schematic diagram of coupling between the decoupling structure in the phase shifter circuit of the utility model and the existing positive coupling transformer.

[0031] Figure 4 It is a schematic diagram of a switch circuit in a phase shifter circuit provided by the utility model.

[0032] Figure 5 yes Figure 1 Detailed schematic of the phase shifter circuit.

[0033] Figure 6 It is a schematic diagram of embodiment 1 of the phase shifter circuit provided by the utility model.

[0034] Figure 7 It is a schematic diagram of Embodiment 2 of the phase shifter circuit provided by the utility model.

[0035] Figure 8 It is a schematic diagram of Embodiment 3 of the phase shifter circuit provided by the utility model.

[0036] Fig. 9 It is a schematic diagram of Embodiment 4 of the phase shifter circuit provided by the utility model.

[0037] Fig.10 It is a schematic diagram of Embodiment 5 of the phase shifter circuit provided by the utility model.

[0038] Fig.11 It is a circuit diagram of an embodiment of two inductors realizing the near zero coupling technology.

[0039] Fig.12 is based on Fig.11 A detailed schematic diagram of the phase shifter circuit of the utility model connected.

[0040] Fig.13 It is a schematic diagram of a multi-phase shifter circuit of the utility model.

[0041] Reference numerals:

[0042] 103. An existing first signal path; 105. An existing positive coupling transformer;

[0043] 201, input node; 202, output node; 203, first signal path; 204, second signal path; 205, decoupling structure; 206, anti-coupling transformer; 207, first end of first inductor L1; 208, second end of first inductor L1; 209, second end of second inductor L2; 210, first end of second inductor L2; 211, second end of third inductor L3; 212, first end of third inductor L3; 213, first end of fourth inductor L4; 214, second end of fourth inductor L4; 215, first end of fifth inductor L5; 216, second end of fifth inductor L5;

[0044] 301, a first end of an eighth inductor L8; 302, a second end of an eighth inductor L8; 303, a first end of a ninth inductor L9; 304, a second end of the ninth inductor L9;

[0045] 401, phase shifter circuit; 402, multiple phase shifter circuit input node; 403, multiple phase shifter circuit output node. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0047] Combine the following Figure 1 A phase shifter circuit of the present invention is described, comprising an input node (IN) 201, an output node (OUT) 202, a first signal path 203 and a second signal path 204, wherein the first signal path 203 and the second signal path 204 are connected in parallel between the input node 201 and the output node 202, and a control signal responsive to the first signal path 203 is inversely proportional to a control signal responsive to the second signal path 204;

[0048] The first signal path 203 includes a first switch M1 connected to the input node 201 , a second switch M2 connected to the output node 202 , and a decoupling structure 205 connected between the first switch M1 and the second switch M2 ;

[0049] The second signal path 204 includes a third switch M3 connected to the input node 201, a fourth switch M4 connected to the output node 202, and an anti-coupling transformer 206 connected between the third switch M3 and the fourth switch M4;

[0050] The decoupling structure 205 includes a first inductor L1 and a second inductor L2 connected in series and a third inductor L3 having one end connected to a connection node between the first inductor L1 and the second inductor L2 and the other end grounded. The first end 207 of the first inductor L1 is connected to the first switch M1, and the second end 209 of the second inductor L2 is connected to the second switch M2.

[0051] Prior art CN216794962U patent, such as Figure 2 As shown, the existing positive coupling transformer 105 in the existing first signal path 103 includes a sixth inductor L6 and a seventh inductor L7, wherein a first end of the sixth inductor L6 is connected to the first switch M1 and a second end is grounded, a first end of the seventh inductor L7 is connected to the second switch M2 and a second end is grounded, wherein the sixth inductor L6 is a primary coil and the seventh inductor L7 is a secondary coil.

[0052] Compared with the prior art, the decoupling structure 205 in the phase shifter circuit of the present invention is Figure 1 , Figure 2 and Figure 3 As shown, the third inductor L3 of the decoupling structure 205 is the mutual inductance M generated by the sixth inductor L6 and the seventh inductor L7 in the existing positive coupling transformer 105 through the coupling factor k1, that is, , the first inductor L1 in the decoupling structure 205 is the sum of the sixth inductor L6 in the existing positive coupling transformer 105 and the mutual inductance M, that is, Similarly, the second inductor L2 in the decoupling structure 205 is the sum of the second inductor L2 in the existing positive coupling transformer 105 and the mutual inductance M, that is, .

[0053] The decoupling structure 205 of the present invention can reduce the parasitic capacitance between the primary coil and the secondary coil caused by the high coupling coefficient while retaining the effect of the existing positive coupling transformer 105 through the decoupling equivalent circuit, thereby improving the phase flatness of the phase shifter circuit.

[0054] Furthermore, at least one of the first switch or the second switch includes one or more field effect transistors (FETs). Similarly, the third switch M3, the fourth switch M4, the fifth switch M5, the sixth switch M6, the seventh switch M7, and the eighth switch M8 involved in the present invention all include one or more field effect transistors (FETs).

[0055] like Figure 4 As shown, Figure 4 Schematic diagram of a switch circuit, for example, a first switch M1, a second switch M2, a third switch M3, a fourth switch M4, etc. in a phase shifter circuit. The s in Ms in the figure indicates that the corresponding switch s value is (1, 2, 3, 4, 5, 6, 7, 8). Figure 4 It can be seen that the switch circuit is composed of n stacked FET tubes (n≥1), and the resistor is connected in series to the gate of the FET tube to isolate the interference of the digital signal on the analog signal. The other end of the resistor is connected to the first control signal Vctrl or the second control signal Vctrl_bar. The power processing capability of the phase shifter circuit can be improved by stacking multiple FET tubes.

[0056] Furthermore, the reverse coupling transformer 206 includes a fourth inductor L4 having one end connected to the third switch M3 and the other end grounded, and a fifth inductor L5 having one end connected to the fourth switch M4 and the other end grounded. The fourth inductor L4 is reversely coupled to the fifth inductor L5 through a coupling factor K2.

[0057] Further, the first signal path 203 further includes a first capacitor C1 connected in parallel to the first inductor L1 and the third inductor L3 and a second capacitor C2 connected in parallel to the second inductor L2 and the third inductor L3;

[0058] The second signal path 204 further includes a third capacitor C3 connected in parallel to the fourth inductor L4 and a fourth capacitor C4 connected in parallel to the fifth inductor L5 .

[0059] Furthermore, if Fig. 9 As shown, the first signal path 203 further includes a fifth capacitor C5 bridged to the decoupling structure 205 , and the second signal path 204 further includes a sixth capacitor C6 bridged to the anti-coupling transformer 206 .

[0060] Further, the first signal path 203 further includes a fifth switch M5 connected in parallel to the first inductor L1 and the third inductor L3 and a sixth switch M6 connected in parallel to the second inductor L2 and the third inductor L3;

[0061] The second signal path 204 further includes a seventh switch M7 connected in parallel to the fourth inductor L4 and an eighth switch M8 connected in parallel to the fifth inductor L5 .

[0062] Furthermore, if Figure 8 As shown, the first signal path 203 further includes a seventh capacitor C7 bridged to the decoupling structure 205 , and the second signal path 204 further includes an eighth capacitor C8 bridged to the anti-coupling transformer 206 .

[0063] Furthermore, the first inductor L1, the second inductor L2 and the third inductor L3 in the decoupling structure 205 have a set angle and a set overlapping area. When the first inductor L1, the second inductor L2 and the third inductor L3 have a set angle and a set overlapping area, approximate zero coupling can be achieved to improve the size of the chip.

[0064] Furthermore, the phase shifter circuit is a 180-degree phase shifter circuit.

[0065] A multi-phase shifter circuit comprises a plurality of phase shifter circuits as above, wherein the plurality of phase shifter circuits are connected in series.

[0066] The phase shifter circuit of the utility model is described in detail below in conjunction with specific embodiments.

[0067] Example 1

[0068] like Figure 1As shown, the phase shifter circuit includes an input node 201, an output node 202, a first signal path 203 and a second signal path 204. The first signal path 203 and the second signal path 204 are connected in parallel between the input node 201 and the output node 202. The control signal responded by the first signal path 203 is in opposite phase to the control signal responded by the second signal path 204.

[0069] The first signal path 203 includes a first switch M1 connected to the input node 201 , a second switch M2 connected to the output node 202 , and a decoupling structure 205 connected between the first switch M1 and the second switch M2 ;

[0070] The second signal path 204 includes a third switch M3 connected to the input node 201, a fourth switch M4 connected to the output node 202, and an anti-coupling transformer 206 connected between the third switch M3 and the fourth switch M4;

[0071] The decoupling structure 205 includes a first inductor L1 and a second inductor L2 connected in series, and a third inductor L3 having one end connected to a connection node between the first inductor L1 and the second inductor L2 and the other end grounded, a first end of the first inductor L1 connected to the first switch M1, and a second end of the second inductor L2 connected to the second switch M2;

[0072] The reverse coupling transformer 206 includes a fourth inductor L4 having one end connected to the third switch M3 and another end grounded, and a fifth inductor L5 having one end connected to the fourth switch M4 and another end grounded. The fourth inductor L4 is reversely coupled to the fifth inductor L5 through a coupling factor K2.

[0073] In Embodiment 1, a 180-degree phase shift is achieved by switching the first switch M1, the second switch M2, the third switch M3, and the fourth switch M4. For example, when the control signal (Vctrl) to which the first switch M1 and the second switch M2 respond is at a high level and the control signal (Vctrl_bar) to which the third switch M3 and the fourth switch M4 respond is at a low level, the first signal path 203 is turned on and the second signal path 204 is turned off, and the control signal generates a first phase shift state through the decoupling structure 205; when the control signal (Vctrl) to which the first switch M1 and the second switch M2 respond is at a low level and the control signal (Vctrl_bar) to which the third switch M3 and the fourth switch M4 respond is at a high level, the second signal path 204 is turned on and the first signal path 203 is turned off, and the control signal generates a second phase shift state through the anti-coupling transformer 206, and the difference between the two phase shift states generates a 180-degree phase shift.

[0074] like Figure 5As shown, a detailed schematic diagram of the phase shifter circuit in Example 1 is given, specifically, a layout wiring diagram of the decoupling structure 205 and the anti-coupling transformer 206 is given, as shown in FIG. Figure 5 As shown, the first end 207 of the first inductor L1 of the decoupling structure 205 is connected to the first switch M1 and the second end 208 of the first inductor L1 is connected to the first end 210 of the second inductor L2, the first end 212 of the third inductor L3 is connected to the second end 208 of the first inductor L1 and the second end 211 of the third inductor L3 is grounded, the second end 209 of the second inductor L2 is connected to the second switch M2 and the first end 210 of the second inductor L2 is connected to the first end 212 of the third inductor L3; the first end 213 of the fourth inductor L4 of the anti-coupling transformer 206 is connected to the third switch M3 and the second end 214 of the fourth inductor L4 is grounded, the routing structure of the fifth inductor L5 is opposite to that of the fourth inductor L4, the first end 215 of the fifth inductor L5 is connected to the fourth switch M4 and the second end 216 of the fifth inductor L5 is grounded.

[0075] Since the decoupling structure 205 is an equivalent circuit of the existing forward coupling transformer 105 , according to the above description, the size of the existing forward coupling transformer 105 and the reverse coupling transformer 206 must be the same to achieve a 180-degree phase shift. Therefore, the size of the decoupling structure 205 is slightly larger than the reverse coupling transformer 206 .

[0076] Example 2

[0077] like Figure 6 As shown, the difference between the phase shifter circuit in Embodiment 2 and the phase shifter circuit in Embodiment 1 is that the first capacitor C1 is connected in parallel to the first inductor L1 and the third inductor L3 of the decoupling structure 205 in Embodiment 2, and the second capacitor C2 is connected in parallel to the second inductor L2 and the third inductor L3; the third capacitor C3 is connected in parallel to the fourth inductor L4 of the anti-coupling transformer 206, and the fourth capacitor C4 is connected in parallel to the fifth inductor L5; the rest of the structure is the same as that in Embodiment 1. The first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 can be used to tune the parasitic capacitance brought by the coil routing of the inductor to achieve the effect of impedance matching, and at the same time, the phase flatness can be improved.

[0078] Example 3

[0079] like Figure 7As shown, the difference between the phase shifter circuit in Embodiment 3 and the phase shifter circuit in Embodiment 1 is that a fifth switch M5 is connected in parallel to the first inductor L1 and the third inductor L3 of the decoupling structure 205, and a sixth switch M6 is connected in parallel to the second inductor L2 and the third inductor L3; a seventh switch M7 is connected in parallel to the fourth inductor L4 of the anti-coupling transformer 206, and an eighth switch M8 is connected in parallel to the fifth inductor L5; the addition of the fifth switch M5, the sixth switch M6, the seventh switch M7 and the eighth switch M8 can better isolate the first signal path 203 and the second signal path 204; the control signal Vctrl_bar of the fifth switch M5 and the sixth switch M6 is in phase opposition to the control signal Vctrl of the first switch M1 and the second switch M2; similarly, the control signal Vctrl of the seventh switch M7 and the eighth switch M8 is in phase opposition to the control signal Vctrl_bar of the third switch M3 and the fourth switch M4. For example, when the first switch M1 and the second switch M2 of the first signal path 203 are turned on, the fifth switch M5 and the sixth switch M6 are turned off, and the seventh switch M7 and the eighth switch M8 of the second signal path 204 are turned on to prevent the signal from leaking from the second signal path 204 to the output node 202 .

[0080] Example 4

[0081] like Figure 8 As shown, the difference between the phase shifter circuit in Embodiment 4 and the phase shifter circuit in Embodiment 1 is that the decoupling structure 205 is bridged with the seventh capacitor C7; the reverse coupling transformer 206 is bridged with the eighth capacitor C8; in an ideal case, if the absolute values ​​of the coupling factors of the conventional forward coupling transformer 105 and the reverse coupling transformer 206 are the same, that is, , then it will provide a relatively large bandwidth, and similarly, the phase shifter circuit of Example 1 will also be the same. However, in the actual layout, the parasitic parameters of the decoupling structure 205 and the anti-coupling transformer 206 are not consistent, especially the parasitic capacitance may cause the deterioration of the phase flatness. Therefore, the purpose of adding the bridge seventh capacitor C7 and the eighth capacitor C8 is to compensate for the difference in the parasitic capacitance components of the decoupling structure 205 and the anti-coupling transformer 206, in order to achieve better phase flatness.

[0082] Example 5

[0083] like Fig. 9As shown, the difference between the phase shifter circuit in Example 5 and the phase shifter circuit in Example 1 is that the first inductor L1 and the third inductor L3 of the decoupling structure 205 of Example 5 are connected in parallel with the first capacitor C1, the second inductor L2 and the third inductor L3 are connected in parallel with the second capacitor C2, and the decoupling structure 205 is bridged with the fifth capacitor C5; the fourth inductor L4 of the anti-coupling transformer is connected in parallel with the third capacitor C3, the fifth inductor L5 is connected in parallel with the fourth capacitor C4, and the anti-coupling transformer is bridged with the sixth capacitor C6; Example 5 is actually formed by combining Example 2 and Example 4, the seventh capacitor C7 is equivalent to the fifth capacitor C5, and the eighth capacitor C8 is equivalent to the sixth capacitor C6. In Example 5, the addition of the bridge capacitor and the parallel capacitor at the same time can better compensate for the parasitic capacitance components of the decoupling structure 205 and the anti-coupling transformer 206, so that they have the same capacitance, and at the same time can improve the phase flatness of the phase shifter circuit.

[0084] Example 6

[0085] like Fig.10 As shown, embodiment 6 is actually a combination of improvements of embodiment 3 and embodiment 5. Further, based on the consideration of parallel connection of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 and the bridge capacitors C5 and C6 for compensating the parasitic capacitance component, a fifth switch M5 and a sixth switch M6 are placed in the first signal path 203, and a seventh switch M7 and an eighth switch M8 are placed in the second signal path 204. The addition of the fifth switch M5, the sixth switch M6, the seventh switch M7 and the eighth switch M8 can better isolate the two signal paths and prevent the signals from affecting each other.

[0086] like Fig.11 As shown, Fig.11 It is an implementation circuit for realizing the approximate zero coupling technology. Generally, in order to make the coupling factor between any two coils zero, the common practice is to keep the two coils as far away as possible. However, this method will cause a large area of ​​waste on the layout. Therefore, the eighth inductor L8 and the ninth inductor L9 are two arbitrary inductors. The first end 301 of the eighth inductor L8 and the second end 302 of the eighth inductor L8 can be connected to an external signal at will. The first end 303 of the ninth inductor L9 and the second end 304 of the ninth inductor L9 can be connected to an external signal at will. The specific method is to place the two coils in a small overlapping area at an arbitrary angle (the angle can be adjusted according to the actual situation, such as placing them in a diagonal form). In this way, an approximate zero coupling factor can be achieved and a very small parasitic parameter will be brought in for compensation. This layout placement technology can reduce the waste of layout area to a certain extent. Fig.11 Two coils of the same size are shown, but coils of any size and shape are possible.

[0087] like Fig.12 As shown, Fig.12 is based on Fig.11 Detailed schematic diagram of the phase shifter circuit of the utility model connected, compared with Figure 5 It can be seen that the connections of the inductor traces are consistent, the difference is that a small part of the area of ​​the first inductor L1 and the second inductor L2 in the decoupling structure 205 overlaps with the third inductor L3. It can be seen that this layout placement technology greatly reduces the waste of the overall phase shifter circuit area, and has little effect on the overall performance of the phase shifter circuit.

[0088] Multi-phase shifter circuit example

[0089] like Fig.13 As shown, the multi-phase shifter circuit can be used as a part of an integrated circuit device and can also be a part of a radio frequency device. Fig.13 The figure shows a 6-phase shifter circuit, including a multi-phase shifter circuit input node 402, a multi-phase shifter circuit output node 403, and 6 adjustable or switchable phase shifter circuits 401. They are connected in series between the multi-phase shifter circuit input node 402 and the multi-phase shifter circuit output node 403. Each phase shifter circuit corresponds to a control signal for controlling the phase shift. By controlling the signals of the 6 phase shifter circuits respectively, 64 phase shifts of 0 to 360 degrees can be achieved, and the 6 phase shifter circuits correspond to control signals Vctrl1, Vctrl2, Vctrl3, Vctrl4, Vctrl5, and Vctrl6 respectively. For example, for a phase shifter circuit 401 adjacent to the input node 402 of the multi-phase shifter circuit, its control signal Vctrl1 can be configured as logic high or logic low to provide a phase shift of 90 degrees or 0 degrees. The remaining 5 phase shifter circuits have the same principle. Each phase shifter circuit has two logic states to provide two phase shifts. Through binary calculation, 64 phase shifts can be obtained by the 6 phase shifter circuits. The phase shifter circuits of the above-mentioned embodiments 1 to 6 can all be used for Fig.13 Any one of the multiple phase shifter circuits in the circuit, but it is more common to use it for 180 degree phase shift.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A phase shifter circuit, characterized in that: The method comprises an input node, an output node, a first signal path and a second signal path, wherein the first signal path and the second signal path are connected in parallel between the input node and the output node, and a control signal responsive to the first signal path is inversely proportional to a control signal responsive to the second signal path; The first signal path includes a first switch connected to the input node, a second switch connected to the output node, and a decoupling structure connected between the first switch and the second switch; The second signal path includes a third switch connected to the input node, a fourth switch connected to the output node, and an anti-coupling transformer connected between the third switch and the fourth switch; The decoupling structure includes a first inductor and a second inductor connected in series, and a third inductor having one end connected to a connection node between the first inductor and the second inductor and the other end grounded, the first end of the first inductor is connected to the first switch, and the second end of the second inductor is connected to the second switch.

2. The phase shifter circuit according to claim 1, characterized in that: The reverse coupling transformer includes a fourth inductor having one end connected to the third switch and the other end grounded, and a fifth inductor having one end connected to the fourth switch and the other end grounded. The fourth inductor is reversely coupled to the fifth inductor through a coupling factor K2.

3. The phase shifter circuit according to claim 2, characterized in that: The first signal path further includes a first capacitor connected in parallel to the first inductor and the third inductor and a second capacitor connected in parallel to the second inductor and the third inductor; The second signal path further includes a third capacitor connected in parallel to the fourth inductor and a fourth capacitor connected in parallel to the fifth inductor.

4. The phase shifter circuit according to claim 3, characterized in that: The first signal path further includes a fifth capacitor bridged to the decoupling structure, and the second signal path further includes a sixth capacitor bridged to the anti-coupling transformer.

5. The phase shifter circuit according to any one of claims 2 or 4, characterized in that: The first signal path further includes a fifth switch connected in parallel to the first inductor and the third inductor and a sixth switch connected in parallel to the second inductor and the third inductor; The second signal path further includes a seventh switch connected in parallel to the fourth inductor and an eighth switch connected in parallel to the fifth inductor.

6. The phase shifter circuit according to claim 2, characterized in that: The first signal path further includes a seventh capacitor bridged to the decoupling structure, and the second signal path further includes an eighth capacitor bridged to the anti-coupling transformer.

7. The phase shifter circuit according to claim 1, characterized in that: The first inductor, the second inductor and the third inductor in the decoupling structure have a set angle and a set overlapping area therebetween.

8. The phase shifter circuit according to claim 1, characterized in that: At least one of the first switch or the second switch includes one or more field effect transistors (FETs).

9. The phase shifter circuit according to claim 1, characterized in that: The phase shifter circuit is a 180 degree phase shifter circuit.

10. A multi-phase shifter circuit, characterized in that: The method comprises a plurality of phase shifter circuits as claimed in claim 1, wherein the plurality of phase shifter circuits are connected in series.

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