Amplitude-phase accurate control circuit and control method

Abstract

The invention provides an amplitude-phase accurate control circuit and method, and relates to the technical field of amplitude-phase control, and the circuit comprises an orthogonal signal generator, two variable gain units, two power dividers, two detectors, two integral operation units, and a combiner. Each variable gain unit, the power divider, the detector and the integral operation unit form an automatic gain control loop to realize accurate adjustment of amplitude and phase; signals are input into the orthogonal signal generator and then combined through two completely symmetrical circuits, the amplitude of the signals before combination is controlled through external control voltage, and the phase and the amplitude of the signals can be adjusted at the same time.

Description

Technical Field

[0001] The present application belongs to the technical field of amplitude and phase control, and specifically relates to an amplitude and phase precise control circuit and control method. Background Art

[0002] Frequency, amplitude, and phase are the three elements of a signal. In many application scenarios, the frequency, amplitude, and phase of the signal need to be controlled to meet a variety of needs. In general phase control, a phase shifter is often used to adjust the signal phase, but the phase shifter itself has a phase error, which will cause the signal phase shift to be inaccurate and non-repeatable, making it difficult to accurately control the phase in real time; at the same time, the phase shifter also has a gain error, which will cause the signal amplitude to change when the phase is adjusted. At this time, in order to ensure the stability of the signal amplitude during phase shifting, additional amplitude control circuits are often added, but this increases circuit risks and phase instability. Summary of the invention

[0003] In order to solve the above-mentioned deficiencies of the prior art, the present application provides an amplitude and phase precise control circuit and control method, which can more accurately control the signal amplitude and phase, and can also adjust the amplitude while accurately adjusting the phase.

[0004] In order to achieve the above object, the present invention adopts the following technologies: An amplitude and phase precision control circuit includes an orthogonal signal generator, a first variable gain unit, a second variable gain unit, a first power divider, a second power divider, a first detector, a second detector, a first integral operation unit, a second integral operation unit, and a combiner; The orthogonal signal generator is connected to the first variable gain unit and the second variable gain unit; The first variable gain unit is connected to the first power divider and the first integral operation unit, and the second variable gain unit is connected to the second power divider and the second integral operation unit; One output of the first power distributor is connected to the first detector, which is connected to the first integral operation unit; one output of the second power distributor is connected to the second detector, which is connected to the second integral operation unit; Another output of the first power distributor and the second power distributor is connected to the combiner; The quadrature signal generator is used to convert the input signal U in Split into two orthogonal signals with the same amplitude and 90° phase difference U 1 and quadrature signals U 2 and are respectively transmitted to the first variable gain unit and the second variable gain unit; The first variable gain unit / the second variable gain unit is used to adjust the orthogonal signal U1 / Orthogonal signal U 2 After amplification, it is divided into two paths through the first power divider / second power divider, one of which is output to the first detector / second detector to form the first detection voltage V 1 / Second detection voltage V 2. Another output signal U 11 / signalU 22 To the combiner to form a combined signal U out ; The first integral operation unit / the second integral operation unit is used to detect the first detection voltage V 1 / Second detection voltage V 2 and the first external control voltage V C1 / Second external control voltage V C2 Get the first negative feedback gain control voltage Vctrl 1 / Second negative feedback gain control voltage Vctrl 2. Output to the first variable gain unit / the second variable gain unit for gain control, so that the combiner outputs a combined signal with adjustable amplitude and phase U out .

[0005] A method for accurate amplitude and phase control is implemented based on an accurate amplitude and phase control circuit, comprising the steps of: Input signal to the quadrature signal generator U in = V cos ωt , ω is the angular frequency, t For time; The orthogonal signal is obtained through the orthogonal signal generator: ; The first external control voltage is controlled by a first automatic gain control loop formed by a first power divider, a first detector, a first integral operation unit, and a first variable gain unit, and a second automatic gain control loop formed by a second power divider, a second detector, a second integral operation unit, and a second variable gain unit. V C1 and a second external control voltage V C2 Calibrate and establish V C1 and U 11 , V C2 and U 22 Linear relationship of amplitude; According to the linear relationship established by calibration, the target phase shift is set to θ, The expected gain is k， Change V C1 To change the gain of the first variable gain unit, ,Change V C2 To change the gain of the second variable gain unit, ; Signal U 11 , signal U 22 After passing through the combiner, the signal amplitude is attenuated to the original , and finally obtain a combined signal with precise amplitude and phase control: ; By adjusting k Achieve amplitude adjustment to ensure k =1, which ensures that the input and output signal amplitudes do not change during phase adjustment; ensure k Unchanged, adjusted θ It is possible to adjust the phase without changing the amplitude; ensure θ Unchanged, adjusted k It is possible to adjust the amplitude while keeping the phase unchanged.

[0006] The beneficial effects of the present invention are: 1. Achieve precise adjustment of amplitude and phase. Specifically, the variable gain unit, power divider, detector, and integral operation unit form an automatic gain control loop, which can accurately control the amplitude of the signal before combining, thereby achieving precise adjustment of the signal amplitude and phase; 2. To achieve simultaneous adjustment of amplitude and phase, the signal is input to the orthogonal signal generator and then combined through two completely symmetrical circuits. The amplitude of the signal before combining is controlled by an external control voltage, which can adjust the phase and amplitude of the signal at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a principle block diagram of an embodiment of the present application.

[0008] Figure 2 It is a specific example circuit diagram of an embodiment of the present application.

[0009] Figure numerals: 1-orthogonal signal generator, 2-first variable gain unit, 3-second variable gain unit, 4-first power divider, 5-second power divider, 6-first detector, 7-second detector, 8-first integral operation unit, 9-second integral operation unit, 10-combiner. DETAILED DESCRIPTION

[0010] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0011] One aspect of the embodiments of the present application provides a precise amplitude and phase control circuit, such as Figure 1 As shown, it includes an orthogonal signal generator 1, a first variable gain unit 2, a second variable gain unit 3, a first power divider 4, a second power divider 5, a first detector 6, a second detector 7, a first integral operation unit 8, a second integral operation unit 9, and a combiner 10.

[0012] The orthogonal signal generator 1 is connected to the first variable gain unit 2 and the second variable gain unit 3; U in Split into two orthogonal signals with the same amplitude and 90° phase difference U 1 and quadrature signals U 2 and are transmitted to the first variable gain unit 2 and the second variable gain unit 3 respectively.

[0013] The first variable gain unit 2 is connected to the first power divider 4, and the second variable gain unit 3 is connected to the second power divider 5. The first variable gain unit 2 is used to adjust the orthogonal signal U 1 is amplified and then transmitted to the first power divider 4, and the second variable gain unit 3 is used to amplify the orthogonal signal U 2 is amplified and then transmitted to the second power distributor 5.

[0014] One output of the first power divider 4 is connected to the first detector 6, and the output forms a first detection voltage through the first detector 6. V 1. Another output signal U 11 To combiner 10.

[0015] One output of the second power divider 5 is connected to the second detector 7, and the output forms a first detection voltage through the second detector 7. V 2. Another output signal U 22 To combiner 10.

[0016] Combiner 10 converts the signalU 11 and signal U 22 After combining, the final combined signal is output U out .

[0017] The first detector 6 is connected to the first integral operation unit 8, and the first integral operation unit 8 is connected to the first variable gain unit 2; the first integral operation unit 8 is used to generate a first detection voltage according to the first detection voltage. V 1 and the first external control voltage V C1 Get the first negative feedback gain control voltage Vctrl 1, to output to the first variable gain unit 2 for gain control.

[0018] The second detector 7 is connected to the second integral operation unit 9; the second integral operation unit 9 is connected to the second variable gain unit 3; the second integral operation unit 9 is used to detect the second voltage according to the second detection voltage. V 2 and the second external control voltage V C2 Get the second negative feedback gain control voltage Vctrl 2, to output to the second variable gain unit 3 for gain control.

[0019] pass Vctrl 1 Gain adjustment of the first variable gain unit 2 and Vctrl 2. The gain of the second variable gain unit 3 is adjusted so that the combiner 10 outputs a combined signal with adjustable amplitude and phase. U out .

[0020] Another aspect of the embodiment of the present application provides a method for precise amplitude and phase control implemented based on the precise amplitude and phase control circuit described in this example, comprising the steps of: Input signal to the quadrature signal generator U in = V cos ωt , ω is the angular frequency, t For time; The orthogonal signal is obtained through the orthogonal signal generator: ; The first external control voltage is controlled by a first automatic gain control loop formed by a first power divider, a first detector, a first integral operation unit, and a first variable gain unit, and a second automatic gain control loop formed by a second power divider, a second detector, a second integral operation unit, and a second variable gain unit. V C1 and a second external control voltageV C2 Calibrate and establish V C1 and U 11 , V C2 and U 22 Linear relationship of amplitude; According to the linear relationship established by calibration, the target phase shift is set to θ, The expected gain is k， Change V C1 To change the gain of the first variable gain unit, ,Change V C2 To change the gain of the second variable gain unit, ; Signal U 11 , signal U 22 After passing through the combiner, the signal amplitude is attenuated to the original , and finally obtain a combined signal with precise amplitude and phase control: .

[0021] By adjusting k Achieve amplitude adjustment to ensure k =1, which can ensure that the input and output signal amplitudes do not change during phase adjustment; k Unchanged, adjusted θ It can achieve that the amplitude does not change while the phase is adjusted; θ Unchanged, adjusted k It is possible to adjust the amplitude while keeping the phase unchanged.

[0022] Specifically, Figure 2 What is shown is a specific implementation form of the control circuit of this example, which is only used for illustration.

[0023] Among them, the orthogonal signal generator 1 is of model QSC-83+, the first variable gain unit 2 and the second variable gain unit 3 are of model MAAM-011100, the first power divider 4 and the second power divider 5 are of model DCW-11-722+, the first detector 6 and the second detector 7 are of model HMC1094; the first integral operation unit 8 and the second integral operation unit 9 are both designed with operational amplifier ADA4610 (abbreviated as op amp), and the in-phase input terminal of the op amp is used to connect the first external control voltage V C1 / Second external control voltage V C2The inverting input terminal is connected to the first detector / the second detector through a resistor, and the inverting input terminal is also connected to the output terminal of the operational amplifier through a capacitor. Here, the optional capacitor used is CT41-0402-X7R-50V-103K-NT, the resistor model used is RC-02W1001FT; the combiner 10 model is SCW-2-722+.

[0024] With input 6GHz, P in =0 dBm For example, the signal P in The input signal U in The signal passes through the orthogonal signal generator QSC-83+ to obtain two signals, which are U 1 and U 2, U 1 and U 2 After passing through the corresponding variable gain unit MAAM-011100 and power divider DCW-11-722+, they are finally combined and output through the combiner SCW-2-722+ and coupled to the detector HMC1094 for detection.

[0025] In calibration to establish V C1 and U 11 , V C2 and U 22 When the amplitude is linear: Record V C1 In voltage V C11 hour U 11 Power P 11 ,exist V C12 Voltage U 11 Power P 12 ,as well as U 11 The power is 0 dBm Voltage at V C10 ,get V C1 and U 11 Power P 1 Relationship: RecordV C2 In voltage V C21 hour U 22 Power P 21 ,exist V C22 Voltage U 22 Power P 22 ,as well as U 22 The power is 0 dBm Voltage at V C20 ,get V C2 and U 22 Power P 2. Relationship: pass V C1 and U 11 Power P 1. Relationship V C2 and U 22 Power P 2. Relationship Building V C1 and U 11 , V C2 and U 22 Linear relationship of amplitude.

[0026] According to the above calibration data, set the target phase shift θ =30°, expected gain k =1, then tan30°=0.577, therefore: Considering that the insertion loss of the combiner SCW-2-722+ at 6GHz is 0.25 dB , therefore, according to the calibration data, the first external control voltage is adjusted V C1 Make U 11 Power P 1= P in +1.76 dB +0.25 dB =2.01dBm , adjust the second external control voltage V C2 Make U 22 Power P 2= P in -3 dB +0.25 dB =-2.75 dBm , so after the combination, we get U out Power is 0 dBm , the phase changes by 30° relative to the input signal.

[0027] On this basis, change , which can achieve signal power increase ,at this time: Adjust the first external control voltage V C1 Make U 11 power P 1= P in +4.76 dB +0.25 dB =5.01 dBm , the second external control voltage V C2 Make U 22 Power P 2= P in +0 dB +0.25 dB =0.25 dBm , so after the combination, we get U out Power 3 dBm , the phase changes by 30° relative to the input signal. Power control is achieved based on precise phase control.

[0028] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application.

Claims

1. A precise amplitude and phase control circuit, characterized in that: It includes an orthogonal signal generator, a first variable gain unit, a second variable gain unit, a first power distributor, a second power distributor, a first detector, a second detector, a first integral operation unit, a second integral operation unit, and a combiner; The orthogonal signal generator is connected to the first variable gain unit and the second variable gain unit; The first variable gain unit is connected to the first power divider and the first integral operation unit, and the second variable gain unit is connected to the second power divider and the second integral operation unit; One output of the first power distributor is connected to the first detector, which is connected to the first integral operation unit; one output of the second power distributor is connected to the second detector, which is connected to the second integral operation unit; Another output of the first power distributor and the second power distributor is connected to the combiner; The quadrature signal generator is used to convert the input signal U in Split into two orthogonal signals with the same amplitude and 90° phase difference U 1 and quadrature signals U 2 and are respectively transmitted to the first variable gain unit and the second variable gain unit; The first variable gain unit / the second variable gain unit is used to adjust the orthogonal signal U 1 / Orthogonal signal U 2 After amplification, it is divided into two paths through the first power divider / second power divider, one of which is output to the first detector / second detector to form the first detection voltage V 1 / Second detection voltage V 2. Another output signal U 11 / signalU 22 To the combiner to form a combined signal U out ; The first integral operation unit / the second integral operation unit is used to detect the first detection voltage V 1 / Second detection voltage V 2 and the first external control voltage V C1 / Second external control voltage V C2 Get the first negative feedback gain control voltage Vctrl 1 / Second negative feedback gain control voltage Vctrl 2. Output to the first variable gain unit / the second variable gain unit for gain control, so that the combiner outputs a combined signal with adjustable amplitude and phase U out .

2. The amplitude and phase precise control circuit according to claim 1, characterized in that: The first integral operation unit / the second integral operation unit both include an operational amplifier, a resistor, and a capacitor. The in-phase input terminal of the operational amplifier is used to connect the first external control voltage V C1 / Second external control voltage V C2 The inverting input terminal is connected to the first detector / the second detector through a resistor, and the inverting input terminal is also connected to the output terminal of the operational amplifier through a capacitor.

3. A method for precise amplitude and phase control, characterized in that: The method is implemented based on the amplitude and phase precise control circuit as claimed in claim 1 or 2, comprising the steps of: Input signal to the quadrature signal generator U in = V cos ωt , ω is the angular frequency, t For time; The orthogonal signal is obtained through the orthogonal signal generator: ； The first external control voltage is controlled by a first automatic gain control loop formed by a first power divider, a first detector, a first integral operation unit, and a first variable gain unit, and a second automatic gain control loop formed by a second power divider, a second detector, a second integral operation unit, and a second variable gain unit. V C1 and a second external control voltage V C2 Calibrate and establish V C1 and U 11 , V C2 and U 22 Linear relationship of amplitude; According to the linear relationship established by calibration, the target phase shift is set to θ, The expected gain is k， Change V C1 To change the gain of the first variable gain unit, ,Change V C2 To change the gain of the second variable gain unit, ; Signal U 11 , signal U 22 After passing through the combiner, the signal amplitude is attenuated to the original , and finally obtain a combined signal with precise amplitude and phase control: ； By adjusting k Achieve amplitude adjustment to ensure k =1, which ensures that the input and output signal amplitudes do not change during phase adjustment; ensure k Unchanged, adjusted θ It is possible to adjust the phase without changing the amplitude. ensure θ Unchanged, adjusted k It is possible to adjust the amplitude while keeping the phase unchanged.

4. The method for precise amplitude and phase control according to claim 3, characterized in that: Calibrate to establish V C1 and U 11 , V C2 and U 22 When the amplitude is linear: Record V C1 In voltage V C11 hour U 11 Power P 11 ,exist V C12 Voltage U 11 Power P 12 ,as well as U 11 The power is 0 dBm Voltage at V C10 ,get V C1 and U 11 Power P 1 Relationship: ； Record V C2 In voltage V C21 hour U 22 Power P 21 ,exist V C22 Voltage U 22 Power P 22 ,as well as U 22 The power is 0 dBm Voltage at V C20 ,get V C2 and U 22 Power P 2. Relationship: ； pass V C1 and U 11 Power P 1. Relationship V C2 and U 22 Power P 2. Relationship Building V C1 and U 11 , V C2 and U 22 Linear relationship of amplitude.

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