Fully differential passive digital phase shifter and communication device

Abstract

The application provides a full differential passive digital controlled phase shifter and a communication device, and relates to the technical field of integrated circuits.The full differential passive digital controlled phase shifter comprises a logic controller and a plurality of phase shift units connected with the logic controller; wherein the plurality of phase shift units with different phase offsets are connected in sequence; each phase shift unit comprises a MOS tube and a phase shift device; wherein the control end of the MOS tube is connected with the logic controller; the logic controller is used for generating a switch signal corresponding to each phase shift unit; and the phase shift unit is used for switching the phase shift unit between a reference state and a phase shift state in response to the switch signal to generate a corresponding phase shift amount. The full differential passive digital controlled phase shifter and the communication device provided by the application can configure the phase shift amount, thereby realizing the required phase shift precision; and by optimizing and combining different phase shift units, a better parasitic amplitude modulation can be obtained, which is also helpful to reduce the insertion loss, thereby meeting the design and use requirements of the phase shifter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated circuits, and in particular to a full-differential passive digitally controlled phase shifter and a communication device. BACKGROUND

[0002] The millimeter wave frequency band is the electromagnetic wave frequency band of 30-300GHz. The millimeter wave phased array has the characteristics of high-rate communication, high-resolution imaging and high-precision detection, so that it is widely used in radar detection, 5G millimeter wave communication, automobile anti-collision radar, security imaging and other fields. As a core module in the phased array system, the phase shifter determines the beam scanning accuracy and the beam scanning range of the phased array system through the phase shift accuracy and the phase shift range, and has a key influence on the performance of the phased array system.

[0003] Generally, the types of semiconductor digital phase shifters mainly include switch line type, loaded line type, reflection type, vector synthesis type, distributed type and active type. Among them, the switch line type phase shifter switches different lengths of transmission line paths through switches, uses path difference to introduce phase delay, and is simple to implement, but the accuracy is affected by process and frequency, and the bandwidth is narrow; the loaded line type phase shifter changes the equivalent electrical length by loading variable reactance elements on the transmission line to adjust the phase, and is compact in size, but has high insertion loss; the reflection type phase shifter reflects the signal through a coupler, changes the reflection phase by switching the terminal load impedance, and has a compact structure and a large phase dynamic range, but the phase error is sensitive and the bandwidth is narrow; the vector synthesis type phase shifter adjusts the amplitude ratio after decomposing the signal into two orthogonal components, and then synthesizes to realize phase change, which has high accuracy and wide bandwidth, but the control is complex and the power consumption is high; the distributed type phase shifter is cascaded by multiple phase shift units, each unit contributes a fixed phase step, and the total phase is the sum of all, which is suitable for high-frequency and wide-band applications, but the inter-stage matching needs to be optimized; the active phase shifter adjusts the gain or phase by using transistors and other active devices, which can realize gain compensation and reduce system loss, but the power consumption is high and the linearity is limited.

[0004] Based on the comprehensive consideration of the above-mentioned multiple types of phase shifters, in the prior art, when realizing a high-frequency, wide-band and low-power phase shifter, a passive high-low pass structure phase shifter is generally selected, but the insertion loss of the passive structure phase shifter is generally large under the conditions of maintaining a relatively optimal phase shift accuracy and parasitic amplitude modulation, and the large insertion loss of the phase shifter greatly deteriorates the overall performance of the phased array system, which is difficult to meet the use requirements. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a full-differential passive digitally controlled phase shifter and a communication device to alleviate the technical problem that the insertion loss of the passive high-low pass structure phase shifter is large in the related art and is difficult to meet the use requirements.

[0006] In a first aspect, an embodiment of the present application provides a full-differential passive digital-controlled phase shifter, comprising: a logic controller, and a plurality of phase shift units connected with the logic controller; wherein the plurality of phase shift units are connected in sequence, and each phase shift unit has a different phase shift in a phase shift state; each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; wherein the control end of the MOS tube is connected with the logic controller; the logic controller is configured to generate a switch signal corresponding to each phase shift unit based on a phase shifter control instruction in response to the phase shifter control instruction; and the phase shift unit is configured to switch the phase shift unit between a reference state and a phase shift state based on the switch signal through the MOS tube in response to the switch signal, so as to generate a corresponding phase shift amount.

[0007] In combination with the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, wherein the plurality of phase shift units comprise a differential 180° phase shift unit, a bridge-T type phase shift unit and a T type phase shift unit; the bridge-T type phase shift unit and the T type phase shift unit are arranged in a preset arrangement manner on both sides of the 180° phase shift unit.

[0008] In combination with the first possible implementation manner of the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, wherein the bridge-T type phase shift unit comprises a differential 90° phase shift unit, a differential 45° phase shift unit and a differential 22.5° phase shift unit; and the T type phase shift unit comprises a differential 11.25° phase shift unit, a differential 5.625° phase shift unit and a differential 2.8° phase shift unit.

[0009] In combination with the second possible implementation manner of the first aspect, an embodiment of the present application provides a third possible implementation manner of the first aspect, wherein along the direction of signal transmission, the differential 2.8° phase shift unit, the differential 11.25° phase shift unit, the differential 45° phase shift unit, the differential 180° phase shift unit, the differential 90° phase shift unit, the differential 22.5° phase shift unit and the differential 5.625° phase shift unit are connected in sequence.

[0010] With reference to the first possible implementation manner of the first aspect, the fourth possible implementation manner of the first aspect is provided in the embodiments of the present application, wherein the differential 180° phase shift unit is configured to realize a 180° phase shift; a plurality of switch branches are arranged before the differential input port and the differential output port; each of the switch branches comprises a MOS transistor and a ground MOS transistor arranged in series between the MOS transistors; the control end of each of the MOS transistors is connected to the logic controller; the differential input port comprises a first input end and a second input end; the differential output port comprises a first output end and a second output end; the switch branches comprise: a first switch branch arranged between the first input end and the first output end; a second switch branch arranged between the first input end and the second output end; a third switch branch arranged between the second input end and the first output end; and a fourth switch branch arranged between the second input end and the second output end.

[0011] With reference to the fourth possible implementation manner of the first aspect, the fifth possible implementation manner of the first aspect is provided in the embodiments of the present application, wherein the bridge T-type phase shift unit comprises two single-ended phase shift units arranged in an array; the two single-ended phase shift units comprise a first single-ended phase shift unit and a second single-ended phase shift unit; one end of the first single-ended phase shift unit corresponds to the first input end of the differential input port, and the other end corresponds to the first output end of the differential output port; one end of the second single-ended phase shift unit corresponds to the second input end of the differential input port, and the other end corresponds to the second output end of the differential output port.

[0012] With reference to the fifth possible implementation manner of the first aspect, the sixth possible implementation manner of the first aspect is provided in the embodiments of the present application, wherein the first single-ended phase shift unit and the second single-ended phase shift unit have the same structure, and comprise: a first MOS transistor arranged between the input end and the output end of the single-ended phase shift unit; a first inductor series branch comprising a first inductor and a second inductor connected in series, and the first inductor series branch is connected in parallel with the first MOS transistor; a first capacitor parallel branch comprising a MOS transistor and a capacitor connected in parallel; one end of the capacitor is connected between the first inductor and the second inductor, and the other end is connected to a third inductor of an inductor parallel branch; an inductor parallel branch comprising a MOS transistor and a third inductor connected in parallel; one end of the third inductor is connected to the capacitor of the first capacitor parallel branch, and the other end is grounded; wherein the first inductor, the second inductor and the third inductor, and the capacitor in the first capacitor parallel branch are the phase shift device.

[0013] With the fourth possible implementation manner of the first aspect, the seventh possible implementation manner of the first aspect is provided, wherein the T-shaped phase shift unit comprises two single-ended phase shift units arranged in an array; the two single-ended phase shift units comprise a third single-ended phase shift unit and a fourth single-ended phase shift unit; one end of the third single-ended phase shift unit corresponds to the first input end of the differential input port, and the other end corresponds to the first output end of the differential output port; one end of the fourth single-ended phase shift unit corresponds to the second input end of the differential input port, and the other end corresponds to the second output end of the differential output port.

[0014] With the seventh possible implementation manner of the first aspect, the eighth possible implementation manner of the first aspect is provided, wherein the third single-ended phase shift unit and the fourth single-ended phase shift unit have the same structure, comprising: a second inductive series branch comprising a fourth inductor and a fifth inductor connected in series; a second capacitive parallel branch comprising a first capacitor and a second capacitor connected in parallel, wherein the second capacitor is also connected in series with a MOS tube; one end of the first capacitor is connected between the fourth inductor and the fifth inductor, and the other end is grounded.

[0015] In the second aspect, the communication device is configured with the all-differential passive digital-controlled phase shifter.

[0016] The embodiments of the present application have the following beneficial effects:

[0017] The all-differential passive digital-controlled phase shifter and the communication device provided in the embodiments of the present application comprise: a logic controller, and a plurality of phase shift units connected with the logic controller; wherein the plurality of phase shift units are connected in sequence, and each phase shift unit has a different phase shift in a phase shift state; each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; the control end of the MOS tube is connected with the logic controller; the logic controller can generate a switch signal corresponding to each phase shift unit based on a phase shifter control instruction in response to the phase shifter control instruction; the phase shift unit responds to the switch signal through the MOS tube, and then switches between the reference state and the phase shift state based on the switch signal to generate a corresponding phase shift amount; since each phase shift unit can realize different phase shifts, the phase shift amount can be configured, thereby realizing the required phase shift precision; and by optimizing the combination of different phase shift units, a better parasitic amplitude modulation can be obtained, which also helps to reduce the insertion loss, thereby meeting the design and use requirements of the phase shifter.

[0018] Other features and advantages of the present application will be set forth in the descriptions that follow, and in part will be apparent from the description or can be learned by practice of the application. The purposes and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0019] In order to make the above objectives, features and advantages of the present application more apparent, the following will specifically describe a preferred embodiment in combination with the accompanying drawings, and the detailed description is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 A structural block diagram of a full-differential passive digital-controlled phase shifter provided by an embodiment of the present application is shown in the figure;

[0022] Figure 2 A circuit schematic diagram of a full-differential passive digital-controlled phase shifter provided by an embodiment of the present application is shown in the figure;

[0023] Figure 3 A circuit schematic diagram of a differential 180° phase shift unit provided by an embodiment of the present application is shown in the figure;

[0024] Figure 4 A circuit schematic diagram of a bridge T type phase shift unit provided by an embodiment of the present application is shown in the figure;

[0025] Figure 5 A circuit schematic diagram of a T type phase shift unit provided by an embodiment of the present application is shown in the figure;

[0026] Figure 6 An equivalent circuit diagram of a differential 90° phase shift unit provided by an embodiment of the present application is shown in the figure;

[0027] Figure 7 An equivalent circuit diagram of a differential 11.25° phase shift unit provided by an embodiment of the present application is shown in the figure;

[0028] Figure 8 A phase error change curve provided by an embodiment of the present application is shown in the figure;

[0029] Figure 9 A spurious amplitude modulation change curve provided by an embodiment of the present application is shown in the figure;

[0030] Figure 10 An insertion loss change curve provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present application.

[0032] At present, in the related art, when a phase shifter with high frequency, wide band and low power consumption is implemented, a passive high-low pass structure is generally selected, but the insertion loss of the phase shifter with the passive structure is generally large in the case of maintaining relatively optimal phase shift precision and parasitic amplitude modulation, and the large insertion loss of the phase shifter has a great deterioration effect on the overall performance of the phased array system, thus it is difficult to meet the design and use requirements.

[0033] Based on this, the full-differential passive digital controlled phase shifter and the communication device provided by the embodiments of the present application can effectively alleviate the above technical problems.

[0034] In order to facilitate the understanding of the embodiments, first, a full-differential passive digital controlled phase shifter disclosed by the embodiments of the present application is introduced in detail.

[0035] In a possible implementation manner, the embodiments of the present application provide a full-differential passive digital controlled phase shifter, as shown in a structure block diagram of a full-differential passive digital controlled phase shifter, the full-differential passive digital controlled phase shifter provided by the embodiments of the present application comprises a logic controller 10 and a plurality of phase shift units 20 connected with the logic controller 10. Figure 1

[0036] Among them, the plurality of phase shift units 20 are connected in sequence, and the phase shift of each phase shift unit 20 in the phase shift state is different.

[0037] Further, each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; wherein the control end of the MOS tube in the embodiments of the present application is connected with the above-mentioned logic controller 10, and the control end usually refers to the gate of the MOS tube.

[0038] The logic controller 10 is used for generating a switch signal corresponding to each phase shift unit 20 based on a phase shifter control instruction in response to the phase shifter control instruction; the phase shift unit 20 is used for switching the phase shift unit between a reference state and a phase shift state based on the switch signal through the MOS tube in response to the switch signal, so as to generate a corresponding phase shift amount.

[0039] ​In the full-differential passive digital controlled phase shifter, the logic controller is connected with a plurality of phase shift units; the plurality of phase shift units are connected in sequence, and each phase shift unit has different phase shift in the phase shift state; each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; the control end of the MOS tube is connected with the logic controller; the logic controller can generate a switch signal corresponding to each phase shift unit based on a phase shifter control instruction in response to the phase shifter control instruction; the phase shift unit switches between the reference state and the phase shift state based on the switch signal through the MOS tube in response to the switch signal, so as to generate a corresponding phase shift amount; since each phase shift unit can realize different phase shift, the phase shift amount can be configured, so as to realize the required phase shift precision; and by optimizing and combining different phase shift units, a better parasitic amplitude modulation can be obtained, which is also helpful to reduce the insertion loss, so as to meet the design and use requirements of the phase shifter.

[0040] Further, the logic controller can be in the form of a digital circuit, such as an inverter, and when the required phase shift amount of the phase shifter is determined, the switch signal of each phase shift unit is also determined; the switch signal of each phase shift unit can be represented by a phase shift amount control code, and a plurality of switch signals with logically opposite signals can be generated by using an inverter to control the switch of each phase shift unit, so as to realize the switching of the entire phase shifter between the reference state and the phase shift state, thereby generating the desired phase shift amount.

[0041] In the full-differential passive digital controlled phase shifter, the logic controller is connected with a plurality of phase shift units; the plurality of phase shift units are connected in sequence, and each phase shift unit has different phase shift in the phase shift state; each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; the control end of the MOS tube is connected with the logic controller; the logic controller can generate a switch signal corresponding to each phase shift unit based on a phase shifter control instruction in response to the phase shifter control instruction; the phase shift unit switches between the reference state and the phase shift state based on the switch signal through the MOS tube in response to the switch signal, so as to generate a corresponding phase shift amount; since each phase shift unit can realize different phase shift, the phase shift amount can be configured, so as to realize the required phase shift precision; and by optimizing and combining different phase shift units, a better parasitic amplitude modulation can be obtained, which is also helpful to reduce the insertion loss, so as to meet the design and use requirements of the phase shifter.

[0042] In the full-differential passive digital controlled phase shifter, the logic controller is connected with a plurality of phase shift units; the plurality of phase shift units are connected in sequence, and each phase shift unit has different phase shift in the phase shift state; each phase shift unit comprises a MOS tube and a phase shift device matched with the MOS tube; the control end of the MOS tube is connected with the logic controller; the logic controller can generate a switch signal corresponding to each phase shift unit based on a phase shifter control instruction in response to the phase shifter control instruction; the phase shift unit switches between the reference state and the phase shift state based on the switch signal through the MOS tube in response to the switch signal, so as to generate a corresponding phase shift amount; since each phase shift unit can realize different phase shift, the phase shift amount can be configured, so as to realize the required phase shift precision; and by optimizing and combining different phase shift units, a better parasitic amplitude modulation can be obtained, which is also helpful to reduce the insertion loss, so as to meet the design and use requirements of the phase shifter.

[0043] Further, the bridge T type phase shift unit in the embodiment of the present application comprises a differential 90° phase shift unit, a differential 45° phase shift unit and a differential 22.5° phase shift unit; the T type phase shift unit comprises a differential 11.25° phase shift unit, a differential 5.625° phase shift unit and a differential 2.8° phase shift unit.

[0044] And, in the embodiment of the present application, along the direction of signal transmission, the differential 2.8° phase shift unit, the differential 11.25° phase shift unit, the differential 45° phase shift unit, the differential 180° phase shift unit, the differential 90° phase shift unit, the differential 22.5° phase shift unit and the differential 5.625° phase shift unit are connected in turn.

[0045] For the convenience of understanding, Figure 2 A circuit schematic diagram of a fully differential passive digital controlled phase shifter is shown, wherein, Figure 2 In the embodiment, the phase shifter is composed of seven fixed phase shift units, i.e. the differential 180° phase shift unit, the differential 90° phase shift unit, the differential 45° phase shift unit, the differential 22.5° phase shift unit, the differential 11.25° phase shift unit, the differential 5.625° phase shift unit and the differential 2.8° phase shift unit, and arranged in the order of differential 2.8° / 11.25° / 45° / 180° / 90° / 22.5° / 5.625° phase shift unit, INV is an inverter, and VG<6:0> and VGN<6:0> are logic opposite phase shifter control signals for the control instructions of each phase shift unit.

[0046] Further, for the convenience of understanding, each phase shift unit is described separately as follows.

[0047] Specifically, the differential 180° phase shift unit in the embodiment is used to realize 180° phase shift; wherein, the differential 180° phase shift unit is provided with a plurality of switch branches before the differential input port and the differential output port; each switch branch comprises a MOS tube connected in series and a ground MOS tube arranged between the MOS tubes connected in series; the control end of each MOS tube is connected with a logic controller.

[0048] For the convenience of understanding, Figure 3 A circuit schematic diagram of a differential 180° phase shift unit is shown, wherein, Figure 3 In the embodiment, VIP and VIN represent the differential input port for inputting differential signals, and VOP and VON represent the differential output port for outputting differential signals; since the differential 180° phase shift unit is connected with other phase shift units, the differential input port of the differential 180° phase shift unit is connected with the output port of the previous stage phase shift unit in the whole phase shifter, such as Figure 2 connected with the output port of the differential 45° phase shift unit; the differential output port of the differential 180° phase shift unit is connected with the input port of the next stage phase shift unit, such as Figure 2 connected with the input port of the differential 90° phase shift unit.

[0049] Further, Figure 3In the embodiment of the present application, in order to realize the input of the differential signal, the differential input port includes a first input end and a second input end, which correspond to the VIP and VIN ports respectively, and the differential output port includes a first output end and a second output end, which correspond to the VOP and VON ports respectively.

[0050] Further, as shown in the figure, Figure 3 The switch branch includes: a first switch branch arranged between the first input end and the first output end; a second switch branch arranged between the first input end and the second output end; a third switch branch arranged between the second input end and the first output end; and a fourth switch branch arranged between the second input end and the second output end.

[0051] Specifically, Figure 3 The first switch branch is composed of MOS tubes M1, M2 and M3, wherein the MOS tubes M1 and M2 are connected in series, and the MOS tube M3 is a ground MOS tube; the second switch branch is composed of MOS tubes M4, M5 and M6, wherein the MOS tubes M4 and M5 are connected in series, and the MOS tube M6 is a ground MOS tube; the third switch branch is composed of MOS tubes M7, M8 and M9, wherein the MOS tubes M7 and M8 are connected in series, and the MOS tube M9 is a ground MOS tube; and the fourth switch branch is composed of MOS tubes M10, M11 and M12, wherein the MOS tubes M10 and M11 are connected in series, and the MOS tube M12 is a ground MOS tube.

[0052] Based on the circuit schematic diagram of the differential 180° phase shift unit shown in the figure, Figure 3 It can be known from the circuit schematic diagram of the differential 180° phase shift unit that the differential 180° phase shift unit in the embodiment of the present application is composed of MOS tubes M1-M12, the differential signal is input from VIP / VIN and output from VOP / VON; wherein the sources of M1 and M4 are connected to VIP, the sources of M7 and M10 are connected to VIN, the drains of M2 and M8 are connected to VOP, the drains of M5 and M11 are connected to VON; the source of M3 is grounded, the drain of M3 is connected to the source-drain of M1 and M2; the source of M6 is grounded, the drain of M6 is connected to the source-drain of M4 and M5; the source of M9 is grounded, the drain of M9 is connected to the source-drain of M7 and M8; and the source of M12 is grounded, the drain of M12 is connected to the source-drain of M10 and M11.

[0053] Further, Figure 4 A circuit schematic diagram of a bridge T-type phase shift unit is also shown, that is, the bridge T-type phase shift unit includes a differential 90° phase shift unit, a differential 45° phase shift unit and a differential 22.5° phase shift unit.

[0054] Specifically, the bridge T-type phase-shifting unit in the embodiment of the present application comprises two single-ended phase-shifting units arranged in an array; wherein the two single-ended phase-shifting units comprise a first single-ended phase-shifting unit and a second single-ended phase-shifting unit; wherein one end of the first single-ended phase-shifting unit corresponds to a first input end of a differential input port, and the other end corresponds to a first output end of a differential output port; one end of the second single-ended phase-shifting unit corresponds to a second input end of the differential input port, and the other end corresponds to a second output end of the differential output port.

[0055] For example, one end of the first single-ended phase-shifting unit corresponds to a VIP differential input port, and the other end corresponds to a VOP differential output port; one end of the second single-ended phase-shifting unit corresponds to a VIN differential input port, and the other end corresponds to a VON differential output port.

[0056] For example, the differential 90° phase-shifting unit is taken as an example to describe the specific structure of the bridge T-type phase-shifting unit.

[0057] Specifically, the first single-ended phase-shifting unit and the second single-ended phase-shifting unit in the above bridge T-type phase-shifting unit have the same structure, comprising:

[0058] A first MOS tube is arranged between the input end and the output end of the single-ended phase-shifting unit, and is connected in parallel with the first inductance series branch and the second inductance series branch. Figure 4 For example, the differential 90° phase-shifting unit in the above bridge T-type phase-shifting unit, M13 is the first MOS tube.

[0059] A first inductance series branch comprises a first inductance and a second inductance connected in series, and the first inductance series branch is connected in parallel with the first MOS tube, Figure 4 In the above bridge T-type phase-shifting unit, L1 and L2 are respectively the first inductance and the second inductance.

[0060] A first capacitance parallel branch comprises a MOS tube M14 and a capacitor C1 connected in parallel; one end of the capacitor C1 is connected between the first inductance L1 and the second inductance L2, and the other end is connected with a third inductance L3 of the inductance parallel branch;

[0061] An inductance parallel branch comprises a MOS tube M15 and a third inductance L3 connected in parallel; one end of the third inductance L3 is connected with the capacitor C1 of the first capacitance parallel branch, and the other end is grounded.

[0062] In the above bridge T-type phase-shifting unit, the first inductance L1, the second inductance L2 and the third inductance L3, and the capacitor C1 in the first capacitance parallel branch are phase-shifting devices.

[0063] Therefore, based on the above bridge T-type phase-shifting unit, Figure 4 , the single-ended phase-shifting unit of the above differential 90° phase-shifting unit in the embodiment of the present application Figure 4The single-ended 90° phase-shifting unit (indicated by the middle arrow) consists of MOSFETs M13 to M15, inductors L1 to L3, and capacitor C1. The input port VIP / VIN is connected to the source of inductor L1 and M13, and the output port VOP / VON is connected to the drain of inductor L2 and M13. The drain of M14 and one end of capacitor C1 are connected between inductors L1 and L2. The source of M14 and the other end of capacitor C1 are connected to the drain of M15 and one end of inductor L3. The source of M15 and the other end of inductor L3 are grounded.

[0064] further, Figure 4 In the above-mentioned differential 45° phase shifting unit, the single-ended phase shifting unit ( Figure 4 The single-ended 45° phase-shifting unit (indicated by the middle arrow) consists of MOSFETs M16 to M18, inductors L4 to L6, and capacitor C2. The input port VIP / VIN is connected to the source of inductor L4 and M16, and the output port VOP / VON is connected to the drain of inductor L5 and M16. The drain of M17 and one end of capacitor C2 are connected between inductors L4 and L5, and the source of M17 and the other end of capacitor C2 are connected to the drain of M18 and one end of inductor L6. The source of M18 and the other end of inductor L6 are grounded.

[0065] further, Figure 4 In the above-mentioned differential 22.5° phase shifting unit, the single-ended phase shifting unit ( Figure 4 The single-ended 22.5° phase-shifting unit (indicated by the middle arrow) consists of MOSFETs M19 to M21, inductors L7 to L9, and capacitor C3. The input port VIP / VIN is connected to the source of inductor L7 and MOSFET M19, and the output port VOP / VON is connected to the drain of inductor L8 and M19. The drain of M20 and one end of capacitor C3 are connected between inductors L7 and L8, and the source of M20 and the other end of capacitor C3 are connected to the drain of M21 and one end of inductor L9. The source of M21 and the other end of inductor L9 are grounded.

[0066] further, Figure 5 A circuit diagram of a T-type phase shifting unit is also shown, including the aforementioned differential 11.25° phase shifting unit, differential 5.625° phase shifting unit, and differential 2.8° phase shifting unit.

[0067] Specifically, similar to the structure of the bridge T-type phase shifting unit described above, the T-type phase shifting unit in this embodiment of the invention includes two single-ended phase shifting units arranged in pairs; wherein, the two single-ended phase shifting units include a third single-ended phase shifting unit and a fourth single-ended phase shifting unit; one end of the third single-ended phase shifting unit corresponds to the first input terminal of the differential input port, and the other end corresponds to the first output terminal of the differential output port; one end of the fourth single-ended phase shifting unit corresponds to the second input terminal of the differential input port, and the other end corresponds to the second output terminal of the differential output port.

[0068] For example, Figure 5In the embodiment, one end of the third single-ended phase shift unit corresponds to the VIP differential input port, and the other end corresponds to the VOP differential output port; one end of the fourth single-ended phase shift unit corresponds to the VIN differential input port, and the other end corresponds to the VON differential output port.

[0069] In the embodiment, the specific structure of the T-shaped phase shift unit is described by taking the differential 11.25° phase shift unit as an example.

[0070] Specifically, the third single-ended phase shift unit and the fourth single-ended phase shift unit in the embodiment have the same structure, as shown in FIG. 2, which includes: Figure 5

[0071] The second inductive series branch includes a fourth inductor L10 and a fifth inductor L11 connected in series.

[0072] The second capacitive parallel branch includes a first capacitor C4 and a second capacitor C5 connected in parallel, wherein the second capacitor C5 is further connected in series with a MOS tube, such as the MOS tube M22 in FIG. 2; one end of the first capacitor C4 is connected between the fourth inductor L10 and the fifth inductor L11, and the other end is grounded. Figure 5

[0073] In the embodiment, the fourth inductor L10, the fifth inductor L11, the first capacitor C4, and the second capacitor C5 are phase shift devices. Figure 5 Therefore, based on the above-mentioned differential 11.25° phase shift unit in the embodiment, a single-ended phase shift unit (the single-ended 11.25° phase shift unit shown by the arrow in FIG. 2) is composed of the MOS tube M22, the inductors L10-L11, and the capacitors C4-C5.

[0074] Figure 5 In the embodiment, the single-ended phase shift unit (the single-ended 5.625° phase shift unit shown by the arrow in FIG. 3) of the differential 5.625° phase shift unit is composed of the MOS tube M23, the inductors L12-L13, and the capacitors C6-C7. Figure 5 In the embodiment, the single-ended phase shift unit (the single-ended 5.625° phase shift unit shown by the arrow in FIG. 3) of the differential 5.625° phase shift unit is composed of the MOS tube M23, the inductors L12-L13, and the capacitors C6-C7.

[0075] Figure 5 Further, Figure 5 Further,

[0076] Figure 5 ​​​​​In the above-mentioned differential 2.8° phase shifting unit, the single-ended phase shifting unit ( Figure 5 The single-ended 2.8° phase-shifting unit (indicated by the middle arrow) consists of a MOSFET M24, inductors L14-L15, and capacitors C8-C9. The input port VIP / VIN is connected to one end of inductor L14, and the output port VOP / VON is connected to one end of inductor L15. One end of capacitors C8-C9 is connected between inductors L14-L15, the other end of capacitor C9 is connected to the drain of M24, and the other end of capacitor C8 and the source of M24 are grounded.

[0077] Furthermore, the above Figure 4 and Figure 5 The phase shift unit shown in the diagram, after the phase shifter codeword is determined, controls the codewords VG<6:0> and VGN<6:0> to control the on / off state of the MOS transistor in the phase shifter unit to achieve the corresponding phase shift amount.

[0078] Therefore, the fully differential passive numerically controlled phase shifter described in this embodiment of the invention achieves a high-precision millimeter-wave passive numerically controlled phase shifter by optimizing the combination of phase shifting units with different structures, and can achieve a phase shift step of 2.8.

[0079] Furthermore, for ease of understanding, the following is based on Figures 2-5 The circuit diagram of the fully differential passive digitally controlled phase shifter shown further illustrates the working principle of the fully differential passive digitally controlled phase shifter in this embodiment of the invention.

[0080] For ease of explanation, the MOS transistor in the embodiments of the present invention can also be referred to as a MOS switch, a switch transistor, or a switch.

[0081] like Figure 2 As shown, once the required phase shift of the phase shifter is determined, the corresponding phase shift control code VG<6:0> is also determined. The control code VG<6:0> is converted by the inverter INV to generate the logically opposite control code VGN<6:0>. The control codes VG<6:0> and VGN<6:0> control the on / off state of the switches in the phase shifting units corresponding to 2.8° / 5.625° / 11.25° / 22.5° / 45° / 90° / 180°, so that the corresponding phase shifting units are in the reference state or the phase shifting state, thereby generating the desired phase shift.

[0082] Furthermore, the phase shifter in this embodiment of the invention is composed of three types of phase shifting units. The first type is a differential 180° phase shifting unit, which achieves phase shifting by switching different phase shifting paths. The second type is a bridge T-type phase shifting unit represented by differential 90° phase shifting units, differential 45° phase shifting units, and differential 22.5° phase shifting units. The third type is a T-type phase shifting unit represented by differential 11.25° phase shifting units, differential 5.625° phase shifting units, and differential 2.8° phase shifting units.

[0083] As shown in the accompanying drawings Figure 3 When VG<6> = 1 (logic high) and VGN<6> = 0 (logic low), MOS transistors M1, M2, M6, M9, M10 and M11 are turned on, and their on-resistances are very small, close to short circuit; MOS transistors M3, M4, M5, M7, M8 and M12 are turned off, and their on-resistances are very large, close to open circuit. When a differential signal is input to VIP / VIN, the positive terminal signal enters from VIP and exits from VOP, and the negative terminal signal enters from VIN and exits from VON. At this time, the differential 180° phase shift unit is in a reference state, and the phase of the differential output signal is phase1.

[0084] Further, when VG<6> = 0 and VGN<6> = 1, MOS transistors M1, M2, M6, M9, M10 and M11 are turned off, and their on-resistances are very large, close to open circuit; MOS transistors M3, M4, M5, M7, M8 and M12 are turned on, and their on-resistances are very small, close to short circuit. When a differential signal is input to VIP / VIN, the positive terminal signal enters from VIP and exits from VON, and the negative terminal signal enters from VIN and exits from VOP. At this time, the differential 180° phase shift unit is in a phase shift state, and the phase of the differential output signal is phase2. The output signal of the phase shift state is exactly opposite to that of the reference state, so the phase of the phase shift state is phase2 = phase1-180°. That is, by switching the logic high and low values of the control code words VG<6> and VGN<6>, a 180° phase shift can be achieved.

[0085] Further, Figure 6 An equivalent circuit diagram of a differential 90° phase shift unit is shown, and the differential 90° phase shift unit is taken as an example to describe the bridge T type phase shift unit.

[0086] As shown in the accompanying drawings Figure 6 The differential 90° phase shift unit shown on the left side (a) is composed of two single-ended 90° phase shift units which are exactly the same. The single-ended 90° phase shift unit is composed of MOS transistors M13-M15, inductors L1-L3 and a capacitor C1. Figure 6 As shown on the right side (b), when the control code word VG<5> = 1 and VGN<5> = 0, M13 and M14 are turned on, and the on-resistances Ron_M13 and Ron_M14 of the corresponding MOS transistors are very small, close to short circuit; M15 is turned off, and the on-resistance is very large, close to open circuit. At this time, M15 is equivalent to a parasitic capacitor Coff_M15. By reasonably selecting the size of M15 and the value of inductor L3, the capacitor Coff_M15 and the inductor L3 are resonant at the center frequency f0 of the phase shifter, and after resonance, they are equivalent to a large resistance Rtank. At this time, the following formula can be obtained:

[0087] R tank=Q*(2π*f0)*L3 (1)

[0088] Where Q is the quality factor of the resonant network, and the large resistor Rtank can prevent the signal from leaking from the input port IN to ground. It can be assumed that the signal enters from IN and exits from OUT with almost no loss. The phase of the output signal is basically the same as the phase of the input signal. At this time, the phase shifter unit is in the reference state, and the phase of the output port signal is phase 3.

[0089] further, Figure 6 In the middle, as shown in (c) on the right, the control codeword VG <5> =0, VGN <5> When the resistance is 1, MOSFETs M13 and M14 are off, and their on-resistance is very high, almost an open circuit. M13 and M14 are equivalent to parasitic capacitances Coff_M13 and Coff_M14. The parasitic capacitance Coff_M14 of M14 and capacitor C1 are connected in parallel and are equivalent to capacitor C1'. MOSFET M15 is on, and its on-resistance Ron_M15 is very low, almost a short circuit. The T-type low-pass network formed by inductors L1 and L2 and capacitor C1' causes the output signal to lag behind the input signal when the signal enters from IN and exits from OUT. At this time, the phase shifter is in phase-shifted state, and the output signal phase is phase 4. By properly setting the component parameters, phase 4 can be made to equal phase 3 - 90°, i.e., by switching the control code word VG. <5> VGN <5> The logic high and low values ​​can achieve a 90° phase shift. The same principle applies to phase shifting units with differential 45° and differential 22.5°, which will not be elaborated here.

[0090] further, Figure 7 An equivalent circuit diagram of a differential 11.25° phase shifting unit is shown. Taking the differential 11.25° phase shifting unit as an example, the T-type phase shifting unit is explained.

[0091] Specifically, such as Figure 7 As shown, the differential 11.25° phase shift unit in the left side (a) consists of two identical single-ended 11.25° phase shift units. Each single-ended 11.25° phase shift unit is composed of a MOSFET M22, inductors L10 and L11, and capacitors C4 and C5. Figure 7 As shown in (b) on the right, the control codeword VG <2> =1, VGN <2> When the resistance is 0, M22 is off, and the on-resistance is very large, close to an open circuit. M22 is equivalent to the parasitic capacitance Coff_M22. The parasitic capacitance Coff_M22 is connected in series with capacitor C5 and then in parallel with capacitor C4, which is equivalent to capacitor C4'. Inductors L10 and L11 and capacitor C4' form a low-pass network, which has a certain phase lag for the signal coming into the input port. At this time, the phase shifter unit is in the reference state, and the output port phase is phase 5.

[0092] further, Figure 7Neutral, right (c) shown, control code word VG<2> = 0, VGN<2> = 1, M22 is turned on, the on-resistance Ron_M22 is small close to short circuit, the capacitor C4 and C5 are in parallel and equivalent to the capacitor C4'', the inductance L10, L11 and the capacitor C4'' form a low-pass network, the signal coming from the input port has a certain phase lag, at this time the phase shifter is in the phase shift state, and the output port phase is phase6. Because the capacitance value of the capacitor C4'' is greater than the capacitance value of the capacitor C4', the phase shift amount of the phase shift state is greater than the phase shift amount of the reference state, and by reasonably setting the parameters of the components, phase6 = phase5-11.25° can be achieved, that is, by switching the logic high and low values of the control code words VG<2>, VGN<2>, a phase shift of 11.25° can be achieved.

[0093] For the differential 5.625° and differential 2.8° phase shift units, the above is the same, and will not be repeated here.

[0094] Therefore, when the required phase shift amount of the phase shifter is determined, the control code words VG<6:0> and VGN<6:0> of the phase shifter are also determined accordingly, the control code words control the on-off of the MOS tube in the phase shift unit, so that the phase shift unit is in the reference state or the phase shift state, and the required phase shift amount of the phase shifter as a whole can be achieved.

[0095] Further, Figure 8 A phase error change curve is shown, Figure 9 A spurious amplitude change curve is shown, Figure 10 A insertion loss change curve is shown, wherein, Figures 8-10 In the embodiment of the present application, the solid line is the change curve optimized by using the full-differential passive digital controlled phase shifter, and the dotted line is the change curve of the phase shifter of the related art passive structure, which is Figures 8-10 It can be seen that the full-differential passive digital controlled phase shifter in the embodiment of the present application realizes a millimeter wave full-differential passive digital controlled phase shifter by optimizing and combining different structures of phase shift units, and can achieve 7bit digital adjustment. Figures 8-10 As shown in the figure, in the frequency range of 27G-32GHZ, the phase shift accuracy, spurious amplitude and insertion loss and other performances are better than those of the classic high-low pass phase shifter structure.

[0096] Further, the embodiment of the present application also provides a communication device, which is configured with the full-differential passive digital controlled phase shifter provided by the above-mentioned embodiment.

[0097] The communication device provided by the embodiment of the present application has the same technical features as the full-differential passive digital controlled phase shifter provided by the above-mentioned embodiment, so it can also solve the same technical problems and achieve the same technical effects.

[0098] The computer program product of the full-differential passive digital-controlled phase shifter and the communication device provided in the embodiments of the present application includes a computer readable storage medium storing program codes, the program codes include instructions for executing the method described in the foregoing embodiments, and specific implementation can be referred to the foregoing embodiments, which will not be described here.

[0099] 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 foregoing embodiments, which will not be described here.

[0100] In addition, in the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0101] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the part of the present application which essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0102] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0103] Finally, it should be noted that the above examples are merely specific embodiments of the present application, and are used to illustrate the technical solutions of the present application, but are not intended to limit the present application. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that any person skilled in the art can still modify or easily think of changes to the technical solutions recorded in the foregoing examples, or make equivalent replacements to some of the technical features, within the technical range disclosed by the present application. These modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fully differential passive numerically controlled phase shifter, characterized in that, include: A logic controller, and a plurality of phase-shifting units connected to the logic controller; The phase shifting units are connected in sequence, and each phase shifting unit has a different phase shift in the phase shifting state. Each of the phase-shifting units includes a MOS transistor and a phase-shifting device matched with the MOS transistor; wherein the control terminal of the MOS transistor is connected to the logic controller; The logic controller is used to respond to phase shifter control commands and generate a switching signal corresponding to each phase shifter unit based on the phase shifter control commands; The phase-shifting unit is used to respond to the switching signal through the MOS transistor, and switch the phase-shifting unit between the reference state and the phase-shifting state based on the switching signal to generate the corresponding phase shift amount; Among them, the multiple phase shifting units include differential 180° phase shifting units, bridge T-type phase shifting units, and T-type phase shifting units; The bridge T-shaped phase shifting unit and the T-shaped phase shifting unit are arranged sequentially on both sides of the 180° phase shifting unit according to a preset arrangement. The bridge T-type phase shifting unit includes a differential 90° phase shifting unit, a differential 45° phase shifting unit, and a differential 22.5° phase shifting unit; The T-type phase shifting unit includes a differential 11.25° phase shifting unit, a differential 5.625° phase shifting unit, and a differential 2.8° phase shifting unit; Along the direction of signal transmission, the differential 2.8° phase shift unit, the differential 11.25° phase shift unit, the differential 45° phase shift unit, the differential 180° phase shift unit, the differential 90° phase shift unit, the differential 22.5° phase shift unit, and the differential 5.625° phase shift unit are connected in sequence.

2. The fully differential passive numerically controlled phase shifter according to claim 1, characterized in that, The differential 180° phase shift unit is used to achieve a 180° phase shift; The differential 180° phase shifting unit has multiple switching branches before the differential input port and the differential output port; Each of the switch branches includes a series-connected MOSFET and a grounded MOSFET disposed between the series-connected MOSFETs; the control terminal of each MOSFET is connected to the logic controller; The differential input port includes a first input terminal and a second input terminal; the differential output port includes a first output terminal and a second output terminal. The switch branch includes: The first switch branch is configured between the first input terminal and the first output terminal; The second switch branch is configured between the first input terminal and the second output terminal; A third switch branch is configured between the second input terminal and the first output terminal; The fourth switch branch is located between the second input terminal and the second output terminal.

3. The fully differential passive numerically controlled phase shifter according to claim 2, characterized in that, The bridge T-type phase shifting unit includes two single-end phase shifting units arranged in pairs. The two single-ended phase shifting units include a first single-ended phase shifting unit and a second single-ended phase shifting unit; One end of the first single-ended phase shifting unit corresponds to the first input terminal of the differential input port, and the other end corresponds to the first output terminal of the differential output port; One end of the second single-ended phase shifter unit corresponds to the second input terminal of the differential input port, and the other end corresponds to the second output terminal of the differential output port.

4. The fully differential passive numerically controlled phase shifter according to claim 3, characterized in that, The first single-ended phase shifting unit and the second single-ended phase shifting unit have the same structure, including: The first MOSFET is disposed between the input and output terminals of the single-ended phase shift unit; The first inductor series branch includes a first inductor and a second inductor connected in series, and the first inductor series branch is connected in parallel with the first MOSFET. The first capacitor parallel branch includes a MOS transistor and a capacitor connected in parallel; one end of the capacitor is connected between the first inductor and the second inductor, and the other end is connected to the third inductor of the inductor parallel branch. The inductor parallel branch includes a MOSFET and a third inductor connected in parallel; one end of the third inductor is connected to the capacitor of the first capacitor parallel branch, and the other end is grounded; Wherein, the first inductor, the second inductor, the third inductor, and the capacitor in the parallel branch of the first capacitor are the phase-shifting device.

5. The fully differential passive numerically controlled phase shifter according to claim 2, characterized in that, The T-shaped phase shifting unit includes two single-ended phase shifting units arranged in pairs. The two single-ended phase shifting units include a third single-ended phase shifting unit and a fourth single-ended phase shifting unit; One end of the third single-ended phase shifting unit corresponds to the first input terminal of the differential input port, and the other end corresponds to the first output terminal of the differential output port; One end of the fourth single-ended phase shifting unit corresponds to the second input terminal of the differential input port, and the other end corresponds to the second output terminal of the differential output port.

6. The fully differential passive numerically controlled phase shifter according to claim 5, characterized in that, The third single-ended phase shifting unit and the fourth single-ended phase shifting unit have the same structure, including: The second inductor series branch includes the fourth and fifth inductors connected in series; The second capacitor parallel branch includes a first capacitor and a second capacitor connected in parallel, wherein the second capacitor is also connected in series with a MOSFET; one end of the first capacitor is connected between the fourth inductor and the fifth inductor, and the other end is grounded.

7. A communication device, characterized in that, The communication device is equipped with a fully differential passive numerically controlled phase shifter as described in any one of claims 1 to 6.

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