CN117176106A - Amplitude and phase integrated control circuit based on resistance attenuation network - Google Patents

Abstract

The invention provides an amplitude and phase integrated control circuit based on a resistance attenuation network, and relates to the technical field of control circuits. The invention provides an amplitude and phase integrated control circuit based on a resistance attenuation network. The circuit includes a phase control network and a symmetrical resistance attenuation network, wherein the phase control network includes a phase control switch tube and a phase control capacitor. The phase control switch tube The control end is connected to the control signal, and the other two connection ends are respectively connected to ground and the first end of the phase control capacitor; the second end of the phase control capacitor is connected to the symmetrical position connection end of the resistance attenuation network. Compared with the existing amplitude and phase control system through cascade, the present invention only adds a phase control switch tube and a capacitor element, which can additionally realize the phase control function while the size of the attenuation unit remains unchanged. At the same time, the integrated setting Circuit insertion loss is avoided and circuit efficiency is improved.

Description

Amplitude and phase integrated control circuit based on resistance attenuation network

Technical field

The invention relates to the technical field of control circuits, and specifically relates to an amplitude and phase integrated control circuit based on a resistance attenuation network.

Background technique

High-precision phase shift and attenuation circuits are widely used in electronic systems such as phased array systems and broadband electronic countermeasures. Their phase shift and attenuation accuracy indicators directly affect core performance such as beam scanning accuracy. They are widely used in large-scale phased arrays and other transceivers. The phase shift and attenuation circuits in the system affect the system cost to a great extent.

Traditional passive phase shifting and attenuation circuits are implemented by cascading high and low pass networks and resistor attenuation networks respectively. Although high-precision phase shifting and attenuation characteristics are achieved in specific frequency bands through parameter optimization, the phase shifting and attenuation circuit structure in this method cannot be reproduced. use, resulting in large circuit size and limiting the improvement of circuit integration.

Contents of the invention

(1) Technical problems solved

In view of the shortcomings of the existing technology, the present invention provides an integrated amplitude and phase control circuit based on a resistance attenuation network, which solves the technical problem of large size of phase shifting and attenuation circuits in the existing technology.

(2) Technical solutions

In order to achieve the above objectives, the present invention is achieved through the following technical solutions:

The invention provides an amplitude and phase integrated control circuit based on a resistance attenuation network, including a phase control network and a symmetrical resistance attenuation network;

Wherein, the phase control network includes a phase control switch tube and a phase control capacitor. The first end of the phase control switch tube is connected to ground, and the second end is connected to the first end of the phase control capacitor.

The third terminal is connected to the control signal;

The second end of the phase control capacitor is connected to a symmetrically located connection end of the resistor attenuation network.

Preferably, the symmetrical resistance attenuation network includes a π-type resistance attenuation network or a bridge T-type resistance attenuation network.

Preferably, the π-type resistance attenuation network includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch tube, a second switch tube and a third switch tube;

Wherein, the first resistor and the third resistor have the same resistance, and the second resistor and the fourth resistor have the same resistance;

The first end and the second end of the second switch tube are respectively connected to the first ends of the first resistor and the second resistor;

The first end and the second end of the third switch tube are respectively connected to the first ends of the third resistor and the fourth resistor;

The second ends of the first resistor and the third resistor are connected to each other, and their connection ends are symmetrically located connection ends of the π-type resistance attenuation network;

The second terminals of the second resistor and the fourth resistor are connected to ground;

The first end of the first switch tube is connected to the input signal, and the second end is connected to the output signal;

The third ends of the first switch tube, the second switch tube and the third switch tube are all connected to control signals, wherein the second switch tube and the third switch tube are connected to control signals in the same direction, and the first switch tube and the second switch tube are connected to the control signal. The switch tube and the third switch tube are connected with mutually opposite control signals.

Preferably, in the amplitude control state, two different amplitude characteristics are achieved by controlling the first switching tube, the second switching tube and the third switching tube;

When the control signal of the first switch tube is high, the first switch tube is turned on, the second switch tube and the third switch tube are disconnected, and the input signal is transmitted through the open state (low resistance state) of the first switch tube;

When the control signal of the first switch tube is low, the second switch tube and the third switch tube are turned on, the first switch tube is disconnected, and the signal passes through the π type composed of the first resistor, the second resistor, the third resistor, and the fourth resistor. Resistive network transmission.

Preferably, in the phase control state, phase control is achieved by controlling the phase control switch;

When the control signal of the phase control switch tube is high, the phase control switch tube is turned on, and the phase control switch tube is equivalent to a resistor; after the phase control capacitor and the resistor are connected in series, the equivalent phase control capacitor is directly connected to the ground, which is the phase reference state;

When the control signal of the phase control switch tube is low, the phase control switch tube is turned off, and the phase control switch tube is equivalent to a small off-state capacitor; the phase control capacitor and the off-state small capacitor are connected in series to ground, which is a phase-shifted state.

Preferably, the bridge T-shaped resistance attenuation network includes a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;

Wherein, the first resistor and the third resistor have the same resistance, and the second resistor and the fourth resistor have the same resistance;

The first end of the first switch tube is connected to the second end of the first switch tube via the second resistor and the fourth resistor;

The first end of the first resistor is connected to the common end of the first switch tube and the second resistor, and the common end is connected to the input signal; the second end of the first resistor is connected to the first end of the third resistor, and the third end of the third resistor is connected to the common end of the first switch tube and the second resistor. The two terminals are connected to the common terminal of the first switch tube and the fourth resistor, and the common terminal is connected to the output signal;

The connection terminals of the first resistor and the third resistor are symmetrically located terminals of the bridge T-shaped resistance attenuation network;

The first end of the second switch tube is connected to the connection end of the second resistor and the fourth resistor; the second end of the second switch tube is grounded through the fifth resistor;

The third ends of the first switch tube and the second switch tube are both connected to control signals, and the control signals connected thereto are mutually opposite control signals.

(3) Beneficial effects

The invention provides an amplitude and phase integrated control circuit based on a resistance attenuation network. Compared with existing technology, it has the following beneficial effects:

The invention provides an amplitude and phase integrated control circuit based on a resistance attenuation network. The circuit includes a phase control network and a symmetrical resistance attenuation network, wherein the phase control network includes a phase control switch tube and a phase control capacitor. The phase control switch tube The control end is connected to the control signal, and the other two connection ends are respectively connected to ground and the first end of the phase control capacitor; the second end of the phase control capacitor is connected to the symmetrical position connection end of the resistance attenuation network. Compared with the existing amplitude and phase control system through cascade, the present invention only adds a phase control switch tube and a capacitor element, which can additionally realize the phase control function while the size of the attenuation unit remains unchanged. At the same time, the integrated setting Circuit insertion loss is avoided and circuit efficiency is improved.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic block diagram of an integrated amplitude and phase control circuit based on a resistance attenuation network according to an embodiment of the present invention;

Figure 2 is a circuit diagram of an integrated amplitude and phase control circuit based on a π-type resistance attenuation network according to an embodiment of the present invention;

Figures 3a and 3b are explanatory diagrams of the amplitude control principle of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figure 4 is the simulation result of the amplitude characteristics of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figure 5 is the attenuation characteristic simulation result of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figures 6a, 6b, and 6c are diagrams illustrating the phase control principle in the reference state (non-attenuation state) of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figure 7 is the simulation result of the phase characteristics of the integrated amplitude and phase control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figure 8 is the simulation result of the phase shift characteristics of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network according to the embodiment of the present invention;

Figure 9 is a circuit diagram of an integrated amplitude and phase control circuit based on a bridge T-shaped resistance attenuation network proposed by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that, for convenience of description, the switching MOSFET is used to represent the controllable (on and off) switching transistor in the embodiment of the present invention, but the switching transistor in the present invention is not limited to the MOSFET. Take MOSFET as an example to illustrate. The third terminal of the MOSFET is the control terminal, that is, the gate; the first terminal is the drain or source, and the second terminal is the drain or source. That is, in the embodiment of the present invention, the drain and source of the switch tube are connected The circuits can be interchanged with each other without being affected. In the embodiment of the present invention, a drive control signal is applied to the control terminal of each switch tube. For the sake of brevity, no further details will be given below. The power switch in the embodiment of the present invention can also be implemented by other controllable switching devices besides MOSFET, such as IGBT.

The embodiment of the present application solves the technical problem of large size of phase shifting and attenuation circuits in the prior art by providing an integrated amplitude and phase control circuit based on a resistance attenuation network. Only a phase control switch is added to the resistance attenuation network unit. The tube and capacitor components enable an additional phase control function while the size of the attenuation unit remains unchanged.

The technical solutions in the embodiments of this application are to solve the above technical problems. The general idea is as follows:

Although high-low pass networks and resistor attenuation network cascades can achieve high-precision phase shifting and attenuation characteristics in specific frequency bands through parameter optimization, they have the following defects: 1. The phase-shifting attenuation circuit structure cannot be reused, resulting in large circuit size and limiting circuit integration. 2. The cascade use of phase shifting and attenuation circuits is required in the amplitude and phase control system, resulting in increased circuit insertion loss and reduced circuit efficiency. In order to solve the above problems, embodiments of the present invention propose to add a phase control sub-circuit to the traditional π-type or bridge T-type resistor attenuation network unit to achieve an additional phase modulation function while keeping the attenuation performance and circuit size of the attenuation circuit unit basically unchanged. .

In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation modes.

Embodiments of the present invention provide an integrated amplitude and phase control circuit based on a resistance attenuation network. As shown in Figure 1, the circuit includes a phase control network and a symmetrical resistance attenuation network. The phase control network includes a phase control switch tube and a phase control switch. capacitor, the control end of the phase control switch tube is connected to the control signal, and the other two connection ends are respectively connected to ground and the first end of the phase control capacitor; the second end of the phase control capacitor is connected to the symmetrical position connection end of the resistance attenuation network .

Compared with the existing amplitude and phase control system through cascade, the embodiment of the present invention only adds a phase control switch and a capacitor element, which can additionally realize the phase control function while the size of the attenuation unit remains unchanged. At the same time, the integration settings to avoid circuit insertion loss and improve circuit efficiency.

In the specific implementation process, the resistance attenuation network includes a π-type or bridge T-type resistance attenuation network. As shown in Figure 2, what is disclosed is an amplitude and phase integrated control circuit based on a π-type resistance attenuation network. In this integrated control circuit, the gate of the phase control switch M0 of the phase control network is connected to the control signal V0, The drain of M0 is connected to ground, the source of M0 is connected to the first end of the phase control capacitor C0, and the second end of C0 is connected to the symmetrical position connection end of the π-type resistor attenuation network. It should be noted that during the specific implementation process, the connection methods of the source and drain of M0 can be interchanged, that is, the drain is connected to C0 and the source is connected to ground.

The π-type resistance attenuation network includes two sets of symmetrical circuit modules and a first switch tube M1; the two sets of symmetrical circuit modules include two resistors and a switch tube respectively, and the drain and source of the second switch tube M2 are respectively connected to the first switch tube M1. The first ends of the resistor R1 and the fifth resistor R5, and the drain and source of the third switching tube M3 are respectively connected to the first ends of R3 and R4. The second ends of the first resistor R1 and the third resistor R3 are connected to each other. The connection end is a symmetrically located connection end of the π-type resistance attenuation network. The second ends of the second resistor and the fourth resistor are grounded. Among them, the second switch tube and the third switch tube are connected to control signals in the same direction.

The source of the first switch M1 is connected to the input signal, the drain is connected to the output signal, and the gate is connected to the control signal. The first switching transistor M1, the second switching transistor M2, and the third switching transistor M3 are connected with mutually opposite control signals.

R1 and R3 have the same resistance, R2 and R4 have the same resistance

The amplitude control principle of the amplitude and phase integrated control circuit based on the π-type resistance attenuation network shown in Figure 2 is shown in Figures 3a and 3b:

As shown in Figure 3a, Vc and They are mutually reverse control signals. When the Vc signal is high, the first switch M1 is turned on, M2 and M3 are disconnected, and the signal is transmitted through the open low-resistance state of M1. At this time, the transmission state is defined as the amplitude reference state (not attenuated). ), that is, the transmission parameter S21 (Vc=1).

As shown in Figure 3b, when the Vc signal is low, switch tubes M2 and M3 are turned on, M1 is turned off, and the signal is transmitted through the π-type resistor attenuation network composed of R1, R2, R3, and R4. At this time, the transmission state is defined as attenuation state, that is, the transmission parameter S21' (Vc=0).

The two transmission states, reference state and attenuation state, have different amplitude characteristics, which can achieve a specific amplitude difference, that is, amplitude modulation. In the simulation design, set the parameters R1=20Ω, R2=220Ω, C0=120fF, the gate length of transistor M1 is 60nm, the gate width is 10um, the gate length of transistor M1 and M2 is 60nm, the gate width is 4um, the attenuation simulation results can be seen in Figure 4 and Figure 5. Figure 5 shows that in the two transmission states of V0=0 and V0=1, the attenuation values are all around 4dB without significant changes, indicating that the state of the phase control network does not affect the attenuation characteristics.

The phase control principle of the integrated amplitude and phase control circuit based on the π-type resistance attenuation network shown in Figure 2 is shown in Figures 6a, 6b, and 6c:

As shown in Figure 6a, when V0 is high, the switch tube M0 is in the off-on state. At this time, the switch tube M0 is equivalent to a small resistance RM0. After the phase control capacitor C0 is connected in series with the open-state equivalent resistance RM0 of the switch tube M0, It can be approximated that C0 is directly grounded, and the equivalent grounding capacitance is large. At this time, the transmission state is defined as the phase reference state (no phase shift), that is, the transmission parameter S21 (Vc=1, V0=1).

As shown in Figure 6b, when V0 is low, the switch tube M0 is in a closed state. At this time, the switch tube M0 is equivalent to an off-state small capacitor CM0. The phase control capacitor C0 is connected in series with the off-state equivalent capacitance CM0 of the switch tube M0. The capacitance value is very small, and the equivalent grounding capacitance value is small. At this time, the transmission state is defined as a phase-shifted state, that is, the transmission parameter S21 (Vc=1, V0=0).

As shown in Figure 6c; in the two transmission states, a specific phase difference value can be achieved, that is, phase modulation can be achieved.

Based on the simulation parameter settings in the above amplitude control principle, the simulation results show that the amplitude and phase integrated control circuit based on the π-type resistance attenuation network designed by the present invention can achieve 10° phase control in the range of 32 to 38 GHz. Refer to Figure 7 and Figure 8 for the phase shift results. From Figure 8, it can be seen that in the two transmission states of Vc=0 and Vc=1, the phase shift values are all around 10° without significant changes, indicating that the amplitude control unit circuit Status does not affect phase shifting characteristics.

As shown in Figure 9. The amplitude and phase integrated control circuit based on the bridge T-shaped resistance attenuation network also proposed in the embodiment of the present invention has the same principle as the amplitude and phase integrated control circuit based on the π-type resistance attenuation network and can achieve the same functions.

It should be noted that the first resistor R11 and the third resistor R21 have the same resistance, and the second resistor R10 and the fourth resistor R20 have the same resistance.

In this circuit, the phase control network includes a phase control switch tube and a phase control capacitor. The control terminal of the phase control switch tube is connected to the control signal, and the other two connection terminals are respectively connected to ground and the first end of the phase control capacitor; The second end of the phase control capacitor is connected to the symmetrically positioned connection end of the bridge T-shaped resistor attenuation network.

The bridge T-type resistance attenuation network includes a first switch tube M1, a second switch tube M2, a first group of symmetrical resistors R11 and R21, a second group of symmetrical resistors R10 and R20, and a fifth resistor R5.

Wherein, the gate electrode of the first switch M1 and the gate electrode of the second switch M2 are connected to mutually opposite control signals.

The first terminal of the first switch M1 is connected to the second terminal of the first switch M1 via resistors R10 and R20.

The first end of resistor R11 is connected to the common end of M1 and R10, and the common end is connected to the input signal; the second end of resistor R11 is connected to the first end of resistor R21, and the second end of resistor R21 is connected to the common end of M1 and R20. terminal, and the common terminal is connected to the output signal.

The connection ends of the resistor R11 and the resistor R21 are the symmetrically positioned connection ends of the bridge T-shaped resistance attenuation network.

The first end of the second switching transistor M2 is connected to the connection end of the resistor R10 and the resistor R20; the second end of the second switching transistor M2 is grounded through the fifth resistor R5.

To sum up, compared with the existing technology, it has the following beneficial effects:

1. Compared with the existing amplitude and phase control system through cascade, the embodiment of the present invention adds a phase control network. The phase control network only includes a phase control switch tube and a capacitor element. The phase control network is connected to the symmetrical resistor attenuation network. Position connection end, the signal performance remains consistent when the original circuit is transmitted in forward or reverse direction, and the phase control function can be additionally realized while the size of the attenuation unit remains unchanged. At the same time, the integrated setting avoids circuit insertion loss and improves the circuit efficiency.

2. In the phase control state, since the amplitude parasitic value caused by changing the phase control switch tube is small, the integrated circuit of the embodiment of the present invention maintains a low amplitude parasitic value during the phase control process.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations are mutually exclusive. any such actual relationship or sequence exists between them. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the foregoing embodiments. The recorded technical solutions may be modified, or some of the technical features thereof may be equivalently replaced; however, these modifications or substitutions shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims (6)

1. An amplitude and phase integrated regulation and control circuit based on a resistance attenuation network is characterized by comprising a phase regulation and control network and a symmetrical resistance attenuation network;

the phase regulation network comprises a phase regulation switch tube and a phase regulation capacitor, wherein the first end of the phase regulation switch tube is grounded, the second end of the phase regulation switch tube is connected with the first end of the phase regulation capacitor, and the third end of the phase regulation switch tube is connected with a control signal;

and the second end of the phase regulating capacitor is connected with the symmetrical position connecting end of the resistance attenuation network.

2. The amplitude phase integrated regulation circuit based on a resistive damping network of claim 1, wherein the symmetrical resistive damping network comprises a pi-type resistive damping network or a bridge T-type resistive damping network.

3. The amplitude-phase integrated regulation and control circuit based on a resistance attenuation network according to claim 2, wherein the pi-type resistance attenuation network comprises a first resistance, a second resistance, a third resistance, a fourth resistance, a first switching tube, a second switching tube and a third switching tube;

the first resistor and the third resistor have the same resistance, and the second resistor and the fourth resistor have the same resistance;

the first end and the second end of the second switch tube are respectively connected with the first ends of the first resistor and the second resistor;

the first end and the second end of the third switch tube are respectively connected with the first ends of the third resistor and the fourth resistor;

the second ends of the first resistor and the third resistor are connected with each other, and the connecting ends are symmetrical position connecting ends of the pi-type resistor attenuation network;

the second ends of the second resistor and the fourth resistor are grounded;

the first end of the first switch tube is connected with an input signal, and the second end of the first switch tube is connected with an output signal;

the third ends of the first switching tube, the second switching tube and the third switching tube are connected with control signals, wherein the control signals of the second switching tube and the third switching tube are connected in the same direction, and the control signals of the first switching tube, the second switching tube and the third switching tube are connected in opposite directions.

4. The amplitude-phase integrated regulation circuit based on a resistance attenuation network according to claim 3, wherein in an amplitude regulation state, two different amplitude characteristics are realized by controlling the first switching tube, the second switching tube and the third switching tube;

when the control signal of the first switching tube is high, the first switching tube is conducted, the second switching tube is disconnected from the third switching tube, and the input signal is transmitted through the on-state low-resistance state of the first switching tube;

when the control signal of the first switching tube is low, the second switching tube is conducted with the third switching tube, the first switching tube is disconnected, and the signal is transmitted through a pi-type resistor network consisting of the first resistor, the second resistor, the third resistor and the fourth resistor.

5. The amplitude-phase integrated regulation and control circuit based on a resistance attenuation network according to claim 3, wherein in a phase regulation and control state, phase regulation and control are realized by controlling a phase regulation and control switching tube;

when the control signal of the phase regulation switching tube is high, the phase regulation switching tube is conducted, and the phase regulation switching tube is equivalent to a resistor; the equivalent phase regulating capacitor is directly grounded after the phase regulating capacitor is connected with the resistor in series, and is in a phase reference state;

when the control signal of the phase regulation switching tube is low, the phase regulation switching tube is disconnected, and the phase regulation switching tube is equivalent to an off-state small capacitor; the phase regulating capacitor and the Guan Taixiao capacitor are connected with the ground in series and are in a phase shift state.

6. The amplitude-phase integrated regulation and control circuit based on a resistance attenuation network according to claim 2, wherein the bridge T-type resistance attenuation network comprises a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;

the first resistor and the third resistor have the same resistance, and the second resistor and the fourth resistor have the same resistance;

the first end of the first switch tube is connected with the second end of the first switch tube through the second resistor and the fourth resistor;

the first end of the first resistor is connected to the common end of the first switch tube and the second resistor, and the common end of the first resistor is connected with an input signal; the second end of the first resistor is connected with the first end of the third resistor, the second end of the third resistor is connected to the common end of the first switch tube and the fourth resistor, and the common end of the third resistor is connected with an output signal;

the connecting ends of the first resistor and the third resistor are symmetrical position connecting ends of a bridge T-shaped resistor attenuation network;

the first end of the second switching tube is connected to the connecting end of the second resistor and the fourth resistor; the second end of the second switching tube is grounded through a fifth resistor;

the third ends of the first switch tube and the second switch tube are connected with control signals, and the control signals connected with the first switch tube and the second switch tube are mutually reverse control signals.