A method, device and circuit for generating high phase noise broadband microwaves

Abstract

The present invention discloses a method for generating high phase noise broadband microwaves, comprising the following steps: outputting a frequency signal satisfying a wide tuning range through a voltage-controlled oscillator VCO; isolating the output frequency signal within a preset wide tuning range and then outputting it, and amplifying the isolated output signal through an amplifier; filtering the amplified frequency signal, wherein the input end of the filter is connected to a standard signal source, and the output end of the filter is connected to a signal input source of a phase detector; performing phase detection on the frequency signal input to the filter based on the standard signal source through the phase detector, and pulling the frequency signal toward the standard signal source, thereby improving the output signal-to-noise ratio. The present invention also relates to a device and a circuit for realizing the above method. The present invention can generate a high phase noise broadband microwave with adjustable width, good spurious suppression and anti-interference capabilities, high phase noise and low power consumption.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a method, device and circuit for generating high phase noise broadband microwaves. Background Art

[0002] In life, electromagnetic waves with a frequency range of 300MHz to 300GHz and a wavelength of one meter to one millimeter are usually called microwaves, and the corresponding electromagnetic wave signals are called microwave signals.

[0003] With the rapid development of science and technology, modern microwave technology has been applied to a wide range of fields such as radar, communication, energy and household appliances. The basis of microwave technology is how to generate microwave signals, and its performance will directly affect the entire electronic system.

[0004] The output frequency range and out-of-band phase noise of the frequency synthesizer are usually determined by the microwave oscillator in the frequency synthesizer. As the core module of the RF receiver, the microwave oscillator has been widely used in wireless communication systems. Almost all microwave signal generating devices are inseparable from the microwave oscillator, and different microwave generation methods are mainly centered on the processing of the microwave signal output by the microwave oscillator. The common microwave oscillators on the market are ring oscillators, LC oscillators and voltage-controlled oscillators VCO. Although the voltage-controlled oscillator VCO, ring oscillators and voltage-controlled oscillators can output microwaves with high phase noise, their width cannot be tuned, and the margin of the phase noise index is small and the power consumption is large. Although the LC oscillator can achieve a higher resonant frequency, it can only output a lower phase noise. The frequency signal source with high phase noise is the heart of modern RF and microwave electronic systems. In some application scenarios, the microwave bandwidth of the frequency signal with high phase noise needs to be adjusted. How to generate a microwave with adjustable width and high phase noise has important research value. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide a method for generating high phase noise broadband microwaves, which has high phase noise, low power consumption and can achieve microwave broadband tuning.

[0006] A second object of the present invention is to provide a high phase noise broadband microwave device, which can realize the above-mentioned high phase noise broadband microwave generation method.

[0007] A third object of the present invention is to provide a high phase noise broadband microwave generating circuit, which can realize the above-mentioned high phase noise broadband microwave generating method.

[0008] One of the purposes of the present invention is achieved by the following technical solution: A method for generating high phase noise broadband microwaves, comprising the following steps:

[0009] S1: Output a frequency signal that meets a wide tuning range through a voltage-controlled oscillator VCO;

[0010] The voltage-controlled oscillator VCO adopts a phase-locked loop structure, including a MOS tube conversion circuit and a switch capacitor array, the MOS tube conversion circuit outputs a resonant frequency signal that can be continuously changed, and the switch capacitor array outputs a resonant frequency signal that can be discretely changed; the output end of the voltage-controlled oscillator VCO is connected to a YIG tuning oscillator, and the YIG tuning oscillator performs frequency synthesis and tuning according to the input continuously changeable resonant frequency signal and the discrete changeable resonant frequency signal, and outputs a frequency signal within a preset wide tuning range;

[0011] S2: isolating the output frequency signal within the preset wide tuning range and then outputting it, and amplifying the isolated output signal through an amplifier;

[0012] S3: Filtering the amplified frequency signal, if it is a low frequency signal, using a low pass filter, if it is a high frequency signal, using a band pass filter, the input end of the filter is connected to a standard signal source, and the output end of the filter is connected to a signal input source of a phase detector;

[0013] S4: The phase detector performs phase detection on the frequency signal input to the filter with the standard signal source, and pulls the frequency signal toward the standard signal source to improve the output signal-to-noise ratio.

[0014] Furthermore, the MOS tube conversion circuit includes a high-voltage MOS tube chain and a low-voltage MOS tube chain. When the input signal is transmitted to the low-voltage MOS tube chain through the high-voltage MOS tube chain, the channel lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain gradually change, thereby generating a continuously variable resonant frequency signal.

[0015] Furthermore, when the phase-locked loop is in an open-loop state, the operating frequency of the voltage-controlled oscillator VCO is preset according to the frequency set by the user. When the phase-locked loop is in a closed-loop state, the tail current value of the voltage-controlled oscillator VCO input is controlled according to the set preset frequency, so that the unilateral output swing of the voltage-controlled oscillator VCO is in a stable state, thereby making the voltage-controlled oscillator VCO oscillate stably.

[0016] The second object of the present invention is achieved by adopting the following technical solution:

[0017] A high phase noise broadband microwave generating device, comprising:

[0018] A voltage controlled oscillator (VCO), wherein the voltage controlled oscillator (VCO) is used to output a frequency signal satisfying a wide tuning range;

[0019] A YIG tuning oscillator, the YIG tuning oscillator is used to synthesize and tune the frequency signal output by the voltage controlled oscillator VCO;

[0020] Fractional frequency division oscillator circuit, used to generate the phase-comparison reference standard signal source required for synthesizing broadband microwave signals;

[0021] An amplifier, used for amplifying the isolated output signal;

[0022] Low-pass filter, used to filter the low-frequency signal after the amplifier output, filter out the intermodulation signal, high-purity point frequency signal and its harmonics;

[0023] The bandpass filter is used to filter the high-frequency signal after the amplifier outputs and remove the high-purity point frequency signal;

[0024] A phase detector, used for phase detection between a reference standard signal output by a small-fraction frequency division oscillator circuit and a frequency signal output by a YIG tuning oscillator;

[0025] The loop integrator is used to integrate and filter the input signal, and generate an integrated voltage which is transmitted to the voltage-controlled oscillator VCO to close the phase-locked loop.

[0026] Furthermore, the voltage controlled oscillator VCO adopts a phase-locked loop structure, one of which includes an accumulation-type MOS tube chain with a differential structure for outputting a continuously variable resonant frequency signal, and the other includes a 4-bit switch capacitor array for outputting a discretely variable resonant frequency signal.

[0027] Furthermore, the voltage controlled oscillator VCO also includes cross coupling and differential inductance, and the cross coupling is used to provide an energy source for the voltage controlled oscillator VCO to maintain stable oscillation when the single-sided output swing of the voltage controlled oscillator VCO is in a reduced amplitude oscillation.

[0028] The second object of the present invention is achieved by adopting the following technical solution:

[0029] A high phase noise broadband microwave generating circuit, comprising:

[0030] A phase-locked loop, an amplifier and a filter, wherein the phase-locked loop comprises a voltage-controlled oscillator VCO, a coupler, a YIG tuned oscillator and a phase detector which are connected in sequence, wherein the voltage-controlled oscillator VCO is connected to the coupler, and the processed signal is output from the coupler to the YIG tuned oscillator, and the YIG tuned oscillator transmits the signal forward to connect the amplifier, the filter and the phase detector in sequence, the input end of the filter is connected to a standard signal source, the output end of the filter is connected to the signal input source end of the phase detector, the voltage output of the phase detector is connected to the input end of the control voltage of the voltage-controlled oscillator through a loop integrator, and the input end of the phase detector is also connected to a fractional frequency division oscillator circuit for generating a phase-detection reference standard signal source required for synthesizing broadband microwave signals.

[0031] Furthermore, the voltage-controlled oscillator VCO includes a MOS tube conversion circuit and a switch capacitor array, the MOS tube conversion circuit includes a high-voltage MOS tube chain and a low-voltage MOS tube chain connected in sequence, the high-voltage MOS tube chain includes a first PMOS high-voltage tube, a second NMOS high-voltage tube, a third PMOS high-voltage tube and a fourth NMOS high-voltage tube, the low-voltage MOS tube chain includes a first PMOS low-voltage tube, a second NMOS low-voltage tube, a third PMOS low-voltage tube and a fourth NMOS low-voltage tube, the gate of the PMOS tube is connected to the gate of the NMOS tube, the drain of the PMOS tube is connected to the drain of the NMOS tube, the high-voltage MOS tube chain is externally connected to a power supply voltage and a control voltage, and the low-voltage MOS tube chain is grounded.

[0032] Furthermore, the lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain are different, and the width ratio of the PMOS tube and the NMOS tube connected in series is 3:1.

[0033] Furthermore, the input end of the voltage controlled oscillator VCO is also connected to a charge pump, and the output end of the charge pump is connected to a fixed level through a capacitor.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] The present invention adopts a phase-locked loop structure to enable a voltage-controlled oscillator (VCO) to output a frequency signal that satisfies a wide tuning range. A frequency signal within a preset width range is synthesized by a YIG tuning oscillator. The output voltage of the phase detector can control the voltage-controlled oscillator (VCO) to pull its output frequency toward a standard signal source, thereby improving the circuit's spurious suppression and anti-interference, reducing power consumption, and improving the output signal-to-noise ratio. In addition, on the basis of the phase-locked loop circuit, a capacitor is added to the charge pump output, which can better filter out high-frequency noise and further improve the phase-locked loop phase noise performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic flow chart of a method for generating high phase noise broadband microwaves according to the present invention;

[0037] Figure 2 It is a schematic diagram of the MOS tube conversion circuit of the present invention;

[0038] Figure 3 It is a schematic diagram of the principle of a high phase noise broadband microwave generating device of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the MOS tube conversion circuit of the present invention. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0041] Embodiment 1

[0042] like Figure 1 As shown, the present invention provides a method for generating high phase noise broadband microwaves, comprising the following steps:

[0043] Step 1: Outputting a frequency signal satisfying a wide tuning range through a voltage-controlled oscillator VCO, wherein the voltage-controlled oscillator VCO adopts a phase-locked loop structure, including a MOS tube conversion circuit and a switch capacitor array, wherein the MOS tube conversion circuit outputs a resonant frequency signal that can be continuously changed, and the switch capacitor array outputs a resonant frequency signal that can be discretely changed; the output end of the voltage-controlled oscillator VCO is connected to a YIG tuning oscillator, and the YIG tuning oscillator performs frequency synthesis and tuning according to the input continuously changeable resonant frequency signal and the discretely changeable resonant frequency signal, and outputs a frequency signal within a preset wide tuning range;

[0044] The delay time and variation range in the MOS tube conversion circuit are determined by the channel length of the MOS tube. The longer the channel length, the greater the delay, the greater the variation range, and the wider the microwave bandwidth formed. Therefore, in order to obtain a continuously variable resonant frequency signal. Figure 2 The MOS tube conversion circuit includes a high-voltage MOS tube chain and a low-voltage MOS tube chain. When the input signal is transmitted to the low-voltage MOS tube chain through the high-voltage MOS tube chain, the channel lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain gradually change. It should be noted that when the channel length in the MOS tube (L>3μm), the relationship between the threshold voltage and the channel length in the circuit is not large. When the channel length (L<3μm), the threshold voltage will change with the change of the channel length. Therefore, for some MOS tubes with a channel length of less than 3μm, it is necessary to The MOS tube chain in the MOS tube conversion circuit should be divided into a high-voltage MOS tube chain and a low-voltage MOS tube chain. In this way, even when a high power supply voltage is used, part of the voltage will be consumed when passing through the high-voltage MOS tube chain. Even if the voltage in the low-voltage MOS tube chain changes with the channel length, it is still within the tolerance range of the low-voltage MOS tube and will not cause damage to the medium and low-voltage tubes in the low-voltage MOS tube chain. At the same time, since the voltage in the high-voltage tube chain is obviously higher than the voltage in the low-voltage tube chain, the swing amplitude of the frequency signal output after passing through the low-voltage tube chain will also increase, the SNR will be improved, and the signal-to-noise ratio will be enhanced.

[0045] In this embodiment, a YIG tuned oscillator is used for frequency tuning. The YIG tuned oscillator has a very good application effect for frequency synthesis because the YIG ball resonator has a very high Q value, a wide tuning bandwidth, good stability, a good noise distribution curve, and a pure spectrum.

[0046] Step 2: Isolate the output frequency signal within the preset wide tuning range and then output it, and amplify the isolated output signal through an amplifier.

[0047] The purpose of isolating the frequency signal output within the preset wide tuning range is to prevent other signals from entering the amplifier and generating unwanted spurious frequencies. The amplifier is used because it is necessary to increase the amplitude of the signal so that the amplitude of all frequency signals can meet the use requirements at room temperature or high and low temperatures after the final output. The amplifier here can be a monolithic amplifier, which is simple to use, low cost, and can significantly improve the waveform quality and meet the use requirements.

[0048] Step three: filter the amplified frequency signal. If it is a low-frequency signal, use a low-pass filter; if it is a high-frequency signal, use a band-pass filter. The input end of the filter is connected to a standard signal source, and the output end of the filter is connected to the signal input source of the phase detector.

[0049] According to the different output signal frequencies, different filters are used to filter out different signals. The low-pass filter is used to filter the low-frequency signal after the amplifier output, and filter out the intermodulation signal, high-purity point frequency signal and its harmonics; the band-pass filter is used to filter the high-frequency signal after the amplifier output, and filter out the high-purity point frequency signal;

[0050] Step 4: The phase detector performs phase detection on the frequency signal input to the filter based on the standard signal source, and pulls the frequency signal toward the standard signal source to improve the output signal-to-noise ratio and obtain a high phase noise broadband microwave frequency signal.

[0051] The standard signal source may be based on a reference signal source provided by an existing fractional frequency oscillation circuit.

[0052] In this embodiment, when the phase-locked loop is in an open-loop state, the operating frequency of the voltage-controlled oscillator VCO is preset according to the frequency set by the user. When the phase-locked loop is in a closed-loop state, the tail current value of the voltage-controlled oscillator VCO input is controlled according to the set preset frequency, so that the single-sided output swing of the voltage-controlled oscillator VCO is in a stable state, thereby making the voltage-controlled oscillator VCO oscillate stably.

[0053] Since the MOS tube conversion circuit and the switch capacitor array in the voltage-controlled oscillator VCO are lossy devices, the corresponding resonance during operation is a damped resonance, and the cross-coupling with negative resistance effect can increase the energy to maintain the stability of the voltage-controlled oscillator VCO. And during stable oscillation, the unilateral output swing will increase with the increase of the tail current. Therefore, in order to take into account the circuit power consumption and phase noise, it is necessary to select a suitable tail current value to keep the unilateral output swing of the voltage-controlled oscillator VCO in a stable state.

[0054] Embodiment 2

[0055] The present invention also provides a device for the above method, such as Figure 3 As shown, it includes a voltage-controlled oscillator VCO, which is used to output a frequency signal that meets a wide tuning range; a YIG tuning oscillator, which is used to synthesize and tune the frequency signal output by the voltage-controlled oscillator VCO; a fractional frequency division oscillator circuit, which is used to generate a phase-detection reference standard signal source required for synthesizing a broadband microwave signal; an amplifier, which is used to amplify the isolated output signal; a low-pass filter, which is used to filter the low-frequency signal output by the amplifier to filter out the intermodulation signal, the high-purity point frequency signal and its harmonics; a band-pass filter, which is used to filter the high-frequency signal output by the amplifier to filter out the high-purity point frequency signal; a phase detector, which is used to realize phase detection between the reference standard signal output by the fractional frequency division oscillator circuit and the frequency signal output by the YIG tuning oscillator; a loop integrator, which is used to realize integration and filtering of the input signal, and generate an integrated voltage to be transmitted to the voltage-controlled oscillator VCO to realize the closed loop of the phase-locked loop.

[0056] In this embodiment, the voltage-controlled oscillator VCO adopts a phase-locked loop structure, one of which includes an accumulation-type MOS tube chain with a differential structure for outputting a continuously variable resonant frequency signal, and the other includes a 4-bit switch capacitor array for outputting a discretely variable resonant frequency signal. The voltage-controlled oscillator VCO also includes cross-coupling and differential inductance. The cross-coupling is used to provide an energy source for the voltage-controlled oscillator VCO to maintain stable oscillation when the unilateral output swing of the voltage-controlled oscillator VCO is in a reduced oscillation.

[0057] The device principle provided in this embodiment is applied to the high phase noise broadband microwave generation method provided in the first embodiment, and has the same execution principle as the high phase noise broadband microwave generation method provided in the first embodiment, and will not be repeated here.

[0058] Embodiment 3

[0059] The present invention also provides a circuit for the above method, referring to Figure 2As shown, it includes a phase-locked loop, an amplifier and a filter. The phase-locked loop includes a voltage-controlled oscillator VCO, a coupler, a YIG tuned oscillator and a phase detector which are connected in sequence, wherein the voltage-controlled oscillator VCO is connected to the coupler, and the processed signal is output from the coupler to the YIG tuned oscillator. The YIG tuned oscillator transmits the signal forward and connects the amplifier, the filter and the phase detector in sequence. The input end of the filter is connected to a standard signal source, the output end of the filter is connected to a signal input source end of the phase detector, the voltage output of the phase detector is connected to the input end of the control voltage of the voltage-controlled oscillator through a loop integrator, and the input end of the phase detector is also connected to a fractional frequency division oscillator circuit for generating a phase-detection reference standard signal source required for synthesizing a broadband microwave signal.

[0060] In this embodiment, the voltage controlled oscillator VCO includes a MOS tube conversion circuit, a cross coupling and a switch capacitor array, and the MOS tube conversion circuit includes a high-voltage MOS tube chain and a low-voltage MOS tube chain connected in sequence. Figure 4 As shown, the high-voltage MOS tube chain includes a first PMOS high-voltage tube, a second NMOS high-voltage tube, a third PMOS high-voltage tube and a fourth NMOS high-voltage tube, and the low-voltage MOS tube chain includes a first PMOS low-voltage tube, a second NMOS low-voltage tube, a third PMOS low-voltage tube and a fourth NMOS low-voltage tube, the gate of the PMOS tube is connected to the gate of the NMOS tube, the drain of the PMOS tube is connected to the drain of the NMOS tube, the high-voltage MOS tube chain is externally connected to the power supply voltage and the control voltage, and the low-voltage MOS tube chain is connected to the ground. The channel lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain are different, and the width ratio of the PMOS tube and the NMOS tube in series is 3:1, wherein the different channel lengths of the MOS tubes are due to the delay time and the variation amplitude in the MOS tube conversion circuit being determined by the channel length of the MOS tube therein, the longer the channel length, the greater the delay, the greater the variation amplitude, and the wider the microwave bandwidth finally formed, and the width ratio of the PMOS tube and the NMOS tube in series is set to 3:1, in order to better obtain the rising edge and falling edge of the output frequency signal.

[0061] When the voltage-controlled oscillator oscillates stably, the cross-coupling presents a switching characteristic. This embodiment does not limit the switching capacitor array. The 4-bit switching capacitor in the prior art can be used, and the multi-bit switching capacitor in the prior art can also be used. The number of capacitor bits and the size of the lowest-bit capacitor switch are determined according to the distribution of the classification tuning curve in the actual circuit.

[0062] In order to further improve the phase noise performance of the phase-locked loop, as a preferred embodiment, the input end of the voltage-controlled oscillator VCO is also connected to a charge pump, and the output end of the charge pump is connected to a fixed level through a capacitor. The capacitor can better filter out high-frequency noise and further improve the phase noise performance of the phase-locked loop.

[0063] refer to Figure 3 Due to the switching effect of cross-coupling, the current entering the resonant circuit can be approximately regarded as a waveform signal of level I. Therefore, the unilateral output swing of the voltage-controlled oscillator at the calculation point will increase with the increase of the tail current. When it is close to V, due to the nonlinearity of the NMOS tube in the MOS tube conversion circuit, the output swing will be affected by the current and voltage in the level I area. The area where the output swing determines I is called the current limiting area, and the area not affected by I is called the voltage limiting area. Therefore, in order to enhance the phase noise of broadband microwaves, it is necessary to control the output swing within the current limiting area. Therefore, according to the number of switch capacitor arrays in the circuit, the appropriate tail current value is selected to control the output swing not to exceed the current limiting area, so that the voltage-controlled oscillator VCO can maintain stable oscillation.

[0064] The circuit principle provided in this embodiment is applied to the high phase noise broadband microwave generation method provided in the first embodiment, and has the same execution principle as the high phase noise broadband microwave generation method provided in the first embodiment, and will not be described in detail here.

[0065] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for generating high phase noise broadband microwaves, characterized in that: The following steps are involved: S1: Output a frequency signal that meets a wide tuning range through a voltage-controlled oscillator VCO; The voltage-controlled oscillator VCO adopts a phase-locked loop structure, including a MOS tube conversion circuit, a cross-coupling and a switch capacitor array, the MOS tube conversion circuit outputs a resonant frequency signal that can be continuously changed, and the switch capacitor array outputs a resonant frequency signal that can be discretely changed; the output end of the voltage-controlled oscillator VCO is connected to a YIG tuning oscillator, and the YIG tuning oscillator performs frequency synthesis and tuning according to the input continuously changeable resonant frequency signal and the discretely changeable resonant frequency signal, and outputs a frequency signal within a preset wide tuning range; S2: isolating the output frequency signal within the preset wide tuning range and then outputting it, and amplifying the isolated output signal through an amplifier; S3: Filtering the amplified frequency signal, if it is a low frequency signal, using a low pass filter, if it is a high frequency signal, using a band pass filter, the input end of the filter is connected to a standard signal source, and the output end of the filter is connected to a signal input source of a phase detector; S4: The phase detector performs phase detection on the frequency signal input to the filter based on the standard signal source, and pulls the frequency signal toward the standard signal source to improve the output signal-to-noise ratio; Among them, the MOS tube conversion circuit includes a high-voltage MOS tube chain and a low-voltage MOS tube chain. When the input signal is transmitted to the low-voltage MOS tube chain through the high-voltage MOS tube chain, the channel lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain gradually change, thereby generating a continuously variable resonant frequency signal.

2. The high phase noise broadband microwave generation method according to claim 1, characterized in that: When the phase-locked loop is in an open-loop state, the operating frequency of the voltage-controlled oscillator VCO is preset according to the frequency set by the user. When the phase-locked loop is in a closed-loop state, the tail current value of the voltage-controlled oscillator VCO input is controlled according to the set preset frequency, so that the unilateral output swing of the voltage-controlled oscillator VCO is in a stable state, thereby making the voltage-controlled oscillator VCO oscillate stably.

3. A device for implementing the method as claimed in claim 1, characterized in that: include: A voltage controlled oscillator (VCO), wherein the voltage controlled oscillator (VCO) is used to output a frequency signal satisfying a wide tuning range; A YIG tuning oscillator, the YIG tuning oscillator is used to synthesize and tune the frequency signal output by the voltage controlled oscillator VCO; Fractional frequency division oscillator circuit, used to generate the phase-comparison reference standard signal source required for synthesizing broadband microwave signals; An amplifier, used for amplifying the isolated output signal; Low-pass filter, used to filter the low-frequency signal after the amplifier output, filter out the intermodulation signal, high-purity point frequency signal and its harmonics; The bandpass filter is used to filter the high-frequency signal after the amplifier outputs and remove the high-purity point frequency signal; A phase detector, used to detect the phase of the reference standard signal output by the small-fraction frequency division oscillator circuit and the frequency signal output by the YIG tuning oscillator, and pull the frequency signal toward the standard signal; The loop integrator is used to integrate and filter the input signal, and generate an integrated voltage which is transmitted to the voltage-controlled oscillator VCO to close the phase-locked loop.

4. The device according to claim 3, characterized in that The voltage controlled oscillator VCO adopts a phase-locked loop structure, one of which includes an accumulation-type MOS tube chain with a differential structure for outputting a continuously variable resonant frequency signal, and the other includes a 4-bit switch capacitor array for outputting a discretely variable resonant frequency signal.

5. The device according to claim 3, characterized in that The voltage controlled oscillator VCO further comprises a cross coupling and a differential inductor, wherein the cross coupling is used to provide an energy source for the voltage controlled oscillator VCO to maintain stable oscillation when the single-side output swing of the voltage controlled oscillator VCO is in a reduced amplitude oscillation.

6. A circuit for use in the method as claimed in claim 1, characterized in that It comprises a phase-locked loop, an amplifier and a filter. The phase-locked loop comprises a voltage-controlled oscillator VCO, a coupler, a YIG tuned oscillator and a phase detector which are connected in sequence. The voltage-controlled oscillator VCO is connected to the coupler. The processed signal is output from the coupler to the YIG tuned oscillator. The YIG tuned oscillator transmits the signal forward which is connected to the amplifier, the filter and the phase detector in sequence. The input end of the filter is connected to a standard signal source. The output end of the filter is connected to a signal input source end of the phase detector. The voltage output of the phase detector is connected to the input end of the control voltage of the voltage-controlled oscillator through a loop integrator. The input end of the phase detector is also connected to a fractional frequency division oscillator circuit for generating a phase-detection reference standard signal source required for synthesizing a broadband microwave signal.

7. The circuit according to claim 6, characterized in that The voltage-controlled oscillator VCO comprises a MOS tube conversion circuit and a switch capacitor array. The MOS tube conversion circuit comprises a high-voltage MOS tube chain and a low-voltage MOS tube chain connected in series in sequence. The high-voltage MOS tube chain comprises a first PMOS high-voltage tube, a second NMOS high-voltage tube, a third PMOS high-voltage tube and a fourth NMOS high-voltage tube. The low-voltage MOS tube chain comprises a first PMOS low-voltage tube, a second NMOS low-voltage tube, a third PMOS low-voltage tube and a fourth NMOS low-voltage tube. The gates of the first PMOS high-voltage tube, the third PMOS high-voltage tube, the first PMOS low-voltage tube and the third PMOS low-voltage tube are respectively connected separately to the gates of the second NMOS high-voltage tube, the fourth NMOS high-voltage tube, the second NMOS low-voltage tube and the fourth NMOS low-voltage tube. The drains of the first PMOS high-voltage tube, the third PMOS high-voltage tube, the first PMOS low-voltage tube and the third PMOS low-voltage tube are respectively connected separately to the drains of the second NMOS high-voltage tube, the fourth NMOS high-voltage tube, the second NMOS low-voltage tube and the fourth NMOS low-voltage tube. The high-voltage MOS tube chain is externally connected to a power supply voltage and a control voltage, and the low-voltage MOS tube chain is grounded.

8. The circuit according to claim 7, characterized in that The channel lengths of the MOS tubes in the high-voltage MOS tube chain and the low-voltage MOS tube chain are different, and the width ratio of the PMOS tube and the NMOS tube connected in series is 3:

1.

9. The circuit according to claim 6, characterized in that The input end of the voltage controlled oscillator VCO is also connected to a charge pump, and the output end of the charge pump is connected to a fixed level through a capacitor.

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