Broadband fast switching local oscillator circuit

Abstract

The utility model relates to the technical field of radio frequency receivers, in particular to a broadband fast switching local oscillator circuit. Comprising N local oscillator units, N frequency multiplication units and a fast switching unit, a local oscillation unit is arranged to generate a low-phase-noise local oscillation signal according to a reference clock source, and a frequency multiplication unit is arranged to carry out frequency multiplication on the generated local oscillation signal to generate an actually required high-frequency local oscillation signal; through the arrangement of the rapid switching unit, the frequency-doubled local oscillator signals are rapidly switched, and the function that each local oscillator unit can be rapidly switched to the same port is completed. The method has the characteristics of high receiver adaptation capability and high frequency switching speed in post-stage signal processing; and meanwhile, miniaturization is realized by adopting a micro-packaging technology.

Description

TECHNICAL FIELD

[0001] The utility model relates to radio frequency receiver technical field, concretely relates to a kind of wideband fast switching local oscillator circuit. BACKGROUND

[0002] With the development of modern war, various advanced systems, multi-platform radars coexist on the battlefield, and electronic warfare receivers face major challenges, requiring wideband receivers with large bandwidth to adapt to the signal processing unit of the rear stage. And tend to high bandwidth, fast frequency conversion, miniaturization, high integration, low power consumption, easy maintenance and other directions. Under this background, the wideband receiver capable of fast frequency conversion enters the field of electronic warfare. The radio frequency receiver with fast switching local oscillator greatly reduces system processing time and improves system utilization. SUMMARY

[0003] The utility model discloses to the long local oscillator switching time of existing radio frequency receiver, system processing time long problem, propose a kind of wideband fast switching local oscillator circuit;Including N local oscillator units, N frequency multiplication units, fast switching unit;By setting local oscillator unit, according to reference clock source generation low phase noise local oscillator signal, by setting frequency multiplication unit, the local oscillator signal generated is multiplied, and the high-frequency local oscillator signal actually required is generated;By setting fast switching unit, the local oscillator signal after frequency multiplication is quickly switched, and the function that each local oscillator unit can be quickly switched to the same port is completed;With the characteristics that the faster the switching frequency speed of the receiver ability is, the faster the signal processing of rear stage is;Micro-encapsulation technology is simultaneously used to realize miniaturization.

[0004] The utility model discloses the following specific implementation contents:

[0005] A kind of wideband fast switching local oscillator circuit, including N local oscillator units, N frequency multiplication units, fast switching unit;

[0006] The input reference clock source signal is input to the input end of the N local oscillator units, and the input end of N frequency multiplication units is connected with the output end;

[0007] The input end of the fast switching unit is connected with the output end of frequency multiplication unit, and the output end of the fast switching unit outputs the local oscillator signal after switching;

[0008] The N local oscillator units are used to generate low phase noise local oscillator signal according to reference clock source signal;

[0009] The N frequency multiplication units are used to multiply the low phase noise local oscillator signal and generate high-frequency local oscillator signal;

[0010] The fast switching unit is used to quickly switch the high-frequency local oscillator signal to the same port.

[0011] For better implementation of the utility model, further, the N local oscillator units all include integrated phase-locked loop, second low pass filter, first drive amplifier;

[0012] The input end of the integrated phase-locked loop inputs reference clock source signal, and the output end is connected with the input end of the second low pass filter;

[0013] The input end of the first drive amplifier is connected with the output end of the second low pass filter, and the output end outputs local oscillator signal of low phase noise;

[0014] The integrated phase-locked loop is used to generate fundamental wave signal of low phase noise and low stray according to reference clock source signal;

[0015] The second low pass filter is used to filter fundamental wave signal of low phase noise and low stray, and obtain filtered fundamental wave signal;

[0016] The first drive amplifier is used to amplify fundamental wave signal and generate local oscillator signal of low phase noise.

[0017] For better implementation of the utility model, further, the integrated phase-locked loop includes phase detector, first low pass filter, voltage-controlled oscillator;

[0018] The input end of the phase detector inputs reference clock source signal, and the output end is connected with the input end of the first low pass filter;

[0019] The output end of the first low pass filter is connected with the input end of the voltage-controlled oscillator;

[0020] The output end of the voltage-controlled oscillator is connected with the input end of the second low pass filter and the input end of the phase detector;

[0021] The phase detector is used to generate local oscillator phase error signal according to reference clock source signal and frequency-divided fundamental wave signal obtained from the voltage-controlled oscillator;

[0022] The first low pass filter is used to generate control voltage signal according to local oscillator phase error signal;

[0023] The voltage-controlled oscillator is used to adjust signal frequency according to control voltage signal and generate fundamental wave signal of low phase noise and low stray.

[0024] For better implementation of the utility model, further, the N frequency multiplication units include frequency multiplier, first high pass filter and first low noise amplifier;

[0025] The input end of the N frequency multipliers is connected with the output end of the N local oscillator units, and the output end of the N frequency multipliers is connected with the input end of the first high pass filter;

[0026] The input end of the first low noise amplifier is connected with the output end of the high pass filter, and the output end of the first low noise amplifier is connected with the input end of the fast switching unit;

[0027] N frequency multipliers are used to generate the local oscillator signal by multiplying the low phase noise and low stray fundamental wave signal;

[0028] The first high pass filter is used to filter out the fundamental wave signal and the harmonic signal in the local oscillator signal;

[0029] The first low noise amplifier is used to amplify the filtered local oscillator signal.

[0030] In order to better realize the utility model, further, the fast switching unit includes N single-pole double-throw switches (SPST), single-pole multi-throw switches (SPNT), a second low noise amplifier, a first PI attenuator, a power divider, N second high pass filters, N second drive amplifiers and N second PI attenuators.

[0031] The input end of the N single-pole double-throw switches (SPST) is connected with the output end of the frequency multiplication unit, and the output end of the N single-pole double-throw switches (SPST) is connected with the input end of the single-pole multi-throw switches (SPNT).

[0032] The input end of the second low noise amplifier is connected with the output end of the single-pole multi-throw switches (SPNT), and the output end of the second low noise amplifier is connected with the input end of the first PI attenuator.

[0033] The input end of the power divider is connected with the output end of the first PI attenuator, and the output end of the power divider is connected with the input end of the N second high pass filters.

[0034] The input end of the N second drive amplifiers is connected with the output end of the N second high pass filters, and the output end of the N second drive amplifiers is connected with the input end of the N second PI attenuators.

[0035] The output end of the N second PI attenuators outputs the local oscillator signal with the set target power.

[0036] The single-pole double-throw switches (SPST) and the single-pole multi-throw switches (SPNT) are used to quickly switch the local oscillator unit.

[0037] The low noise amplifier and the drive amplifier are used to amplify the local oscillator signal power.

[0038] The power divider is used to branch the local oscillator signal to realize the local oscillator of the multi-channel receiver.

[0039] The first PI attenuator and the second PI attenuator are used for link impedance matching and local oscillator output power adjustment.

[0040] In order to better realize the utility model, further, N local oscillator units generate N different frequency carrier signals.

[0041] In order to better realize the utility model, further, the wideband fast switching local oscillator circuit further includes a power module.

[0042] The power module is connected with the input end of the local oscillator unit, the input end of the frequency multiplication unit and the input end of the fast switching unit.

[0043] The utility model has the following beneficial effects:

[0044] The utility model has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The utility model provides a principle diagram of wideband fast switching local oscillator.

[0046] Figure 2 The utility model provides a principle diagram of local oscillator unit.

[0047] Figure 3 The utility model provides a principle diagram of frequency multiplication unit.

[0048] Figure 4 The utility model provides a principle diagram of fast switching unit. DETAILED DESCRIPTION

[0049] In order to make the technical scheme of the utility model embodiments clearer, the technical scheme in the utility model embodiments will be described clearly and completely in conjunction with the drawings in the utility model embodiments below, and it should be understood that the described embodiments are only a part of the embodiments of the utility model, not all the embodiments, therefore should not be regarded as the limitation to the protection scope.Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor are all within the protection scope of the utility model.

[0050] In the description of the utility model, it is to explain, unless another explicit provision and limitation, term "arrangement", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Also can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0051] Embodiment 1:

[0052] The embodiment provides a wideband fast switching local oscillator circuit, as shown in the figure, comprising N local oscillator units, N frequency multiplication units, a fast switching unit; Figure 1

[0053] The input end of the N local oscillator units inputs a reference clock source signal, and the output end is connected with the input end of the N frequency multiplication units;

[0054] The input end of the fast switching unit is connected with the output end of the frequency multiplication unit, and the output end of the fast switching unit outputs a switched local oscillator signal;

[0055] The N local oscillator units are used to generate low-phase-noise local oscillator signals according to the reference clock source signal;

[0056] The N frequency multiplication units are used to perform frequency multiplication processing on the low-phase-noise local oscillator signals to generate high-frequency local oscillator signals;

[0057] The fast switching unit is used to rapidly switch the high-frequency local oscillator signals to the same port.

[0058] Working principle: the embodiment comprises N local oscillator units, N frequency multiplication units and a fast switching unit;The local oscillator units are arranged to generate low-phase-noise local oscillator signals according to a reference clock source, the frequency multiplication units are arranged to perform frequency multiplication on the generated local oscillator signals to generate high-frequency local oscillator signals actually needed, and the fast switching unit is arranged to rapidly switch the frequency-multiplied local oscillator signals, so that the function of rapidly switching the local oscillator units to the same port is realized;The embodiment has the characteristics of strong adaptability to receivers, high speed of signal processing switching in the later stage, and small size realized by using micro packaging technology.

[0059] The local oscillator units arranged in the embodiment are used to generate low-phase-noise local oscillator signals, and the generated local oscillator signals are sent to the frequency multiplication units for frequency multiplication processing after passing through a second low-pass filter and a drive amplifier.

[0060] The frequency multiplication units arranged in the embodiment are used to perform frequency multiplication on the generated local oscillator signals to generate high-frequency local oscillator signals actually needed, and the frequency multiplication units also undertake the work of filtering the fundamental wave signals before frequency multiplication.​

[0061] The fast switching unit is arranged to quickly switch the frequency-doubled local oscillator signal, and complete the function of quickly switching the local oscillator units to the same port. The embodiment is arranged with four local oscillator units. The frequency switching time can reach 50 ns.

[0062] Embodiment 2:

[0063] The embodiment is based on the above-described embodiment 1, as shown in the figure, the N local oscillator units are integrated with a phase-locked loop, a second low-pass filter, and a first driving amplifier. Figure 2

[0064] The input end of the integrated phase-locked loop inputs a reference clock source signal, and the output end is connected with the input end of the second low-pass filter.

[0065] The output end of the first driving amplifier is connected with the output end of the second low-pass filter, and the output end outputs a local oscillator signal with low phase noise.

[0066] The integrated phase-locked loop is used to generate a fundamental wave signal with low phase noise and low spurious according to the reference clock source signal.

[0067] The second low-pass filter is used to filter the fundamental wave signal with low phase noise and low spurious to obtain a filtered fundamental wave signal.

[0068] The first driving amplifier is used to amplify the fundamental wave signal to generate a local oscillator signal with low phase noise.

[0069] Working principle: Each local oscillator unit generates a different carrier frequency signal, for example: 5.75 GHz, 6.25 GHz, 6.75 GHz, and 7.25 GHz. According to the required local oscillator frequency range of the receiver, the frequency multiplication coefficient is selected, for example: the frequency multiplication coefficient is selected to be 4 times. After passing through the frequency multiplication unit, the output frequencies of each local oscillator are 23 GHz, 25 GHz, 27 GHz, and 29 GHz. Then, through the fast switching unit, different local oscillator frequencies can be quickly switched into the receiver channel. This enables the receiver to quickly complete the ultra-wideband working requirement, for example: the working frequency is 2-18 GHz, and the working bandwidth is 2 GHz.

[0070] The local oscillator unit arranged in the embodiment is used to generate a local oscillator signal with low phase noise. The generated local oscillator signal is sent to the frequency multiplication unit for frequency multiplication processing after passing through the second low-pass filter and the driving amplifier.

[0071] The local oscillator unit arranged in the embodiment comprises a phase-locked loop PLL integrated with a VCO, a second low-pass filter, and a first driving amplifier.

[0072] The PLL integrated with the VCO is used to generate a fundamental wave signal with low phase noise and low spurious.​

[0073] The second low-pass filter is used to filter the fundamental wave signal generated by the integrated VCO PLL to remove high harmonic components and part of the noise signal.

[0074] The first drive amplifier is used to amplify the signal after the second low-pass filter. The fundamental wave signal needs to drive the frequency multiplier of the later frequency multiplication unit, so the drive amplifier is needed to complete the medium power output.

[0075] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1, and will not be described again.

[0076] Embodiment 3:

[0077] This embodiment is based on any one of the above-mentioned embodiments 1-2, as shown in the figure, the integrated phase-locked loop includes a phase detector, a first low-pass filter, a voltage-controlled oscillator; Figure 2

[0078] The input end of the phase detector inputs the reference clock source signal, and the output end is connected with the input end of the first low-pass filter;

[0079] The output end of the first low-pass filter is connected with the input end of the voltage-controlled oscillator;

[0080] The output end of the voltage-controlled oscillator is connected with the input end of the first low-pass filter and the input end of the phase detector;

[0081] The phase detector is used to generate the local oscillator phase error signal according to the reference clock source signal and the frequency-divided fundamental wave signal obtained from the voltage-controlled oscillator;

[0082] The first low-pass filter is used to generate the control voltage signal according to the local oscillator phase error signal, and is used for loop filtering;

[0083] The voltage-controlled oscillator is used to adjust the signal frequency according to the control voltage signal, and generate the low-phase-noise and low-stray fundamental wave signal.

[0084] Working principle: the clock source sends the standard frequency signal to the phase detector; the signal output by the voltage-controlled oscillator is frequency-divided to the phase detector, the phase detector compares the phase according to the signal input by the clock source and the frequency-divided signal output by the voltage-controlled oscillator, generates the local oscillator phase error signal, and the local oscillator phase error signal is converted into the local oscillator voltage error signal by the phase detector; after the local oscillator voltage error signal is filtered by the first low-pass filter, the control voltage signal of the voltage-controlled oscillator is formed, the control voltage signal of the voltage-controlled oscillator changes and locks the signal frequency output by the voltage-controlled oscillator, and the signal output by the voltage-controlled oscillator is sent to the drive amplifier for power amplification after the harmonic is filtered by the first low-pass filter. Finally, the output signal is the required local oscillator signal. ​

[0085] The other parts of this embodiment are the same as any one of Embodiment 1-Embodiment 2 described above, and thus will not be described again.

[0086] Embodiment 4:

[0087] This embodiment is based on any one of Embodiment 1-Embodiment 3 described above, as shown, the frequency multiplication unit includes a frequency multiplier, a first high-pass filter, a first low-noise amplifier; Figure 3

[0088] The input end of the N frequency multipliers is connected with the output end of the N local oscillator units, and the output end of the N frequency multipliers is connected with the input end of the first high-pass filter;

[0089] The input end of the first low-noise amplifier is connected with the output end of the high-pass filter, and the output end of the first low-noise amplifier is connected with the input end of the fast switching unit;

[0090] N frequency multipliers for multiplying the low phase noise and low stray fundamental signal to generate the local oscillator signal;

[0091] The first high-pass filter is used to filter out the fundamental signal and harmonic signal in the local oscillator signal;

[0092] The first low-noise amplifier is used to amplify the filtered local oscillator signal.

[0093] Working principle: this embodiment multiplies the generated local oscillator signal to generate the actual required high-frequency local oscillator signal, and the frequency multiplication unit also undertakes the work of filtering out the fundamental signal before frequency multiplication.

[0094] The frequency multiplication unit provided in this embodiment includes a frequency multiplier, for example, a 4 frequency multiplier, a first high-pass filter, and a first low-noise amplifier connected in sequence.

[0095] The frequency multiplier is used to multiply the fundamental signal to obtain the desired local oscillator frequency.

[0096] The first high-pass filter is used to filter the multiplied signal, and filter out the fundamental signal after frequency multiplication and the multiple frequency signals of the fundamental signal.

[0097] The first low-noise amplifier is used to amplify the frequency multiplied local oscillator signal to ensure that the amplitude of the local oscillator signal entering the subsequent fast switching unit is not too small.

[0098] As shown in Figure 3 ​The structure schematic diagram of frequency multiplication unit provided by the embodiment is shown. The frequency multiplication unit link includes frequency multiplier, for example, 4 frequency multiplication, high pass filter, low noise amplifier. The fundamental wave signal generated by the local oscillator unit is multiplied by the frequency multiplier, for example, 4 frequency multiplication, and the local oscillator signal with better frequency is generated after frequency multiplication. Since the fundamental wave leaks after passing through the frequency multiplier and the multiple harmonics of other fundamental waves, the unwanted fundamental wave signal and harmonic signal are filtered out by using the high pass filter. Then, the local oscillator signal is amplified by the low noise amplifier. The amplifier has the characteristics of large gain and small noise.

[0099] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-embodiment 3, and thus will not be described again.

[0100] Embodiment 5:

[0101] The embodiment is based on any one of the above-mentioned embodiments 1-embodiment 4, as shown, including N single pole double throw switches SPST, single pole multiple throw switches SPNT, second low noise amplifiers, first PI attenuators, power dividers, N second high pass filters, N second drive amplifiers, and N second PI attenuators. Figure 4

[0102] The input end of the N single pole double throw switches SPST is connected with the output end of the frequency multiplication unit, and the output end of the N single pole double throw switches SPST is connected with the input end of the single pole multiple throw switches SPNT.

[0103] The input end of the second low noise amplifier is connected with the output end of the single pole multiple throw switches SPNT, and the output end of the second low noise amplifier is connected with the input end of the first PI attenuator.

[0104] The input end of the power divider is connected with the output end of the first PI attenuator, and the output end of the power divider is connected with the input end of the N second high pass filters.

[0105] The input end of the N second drive amplifiers is connected with the output end of the N second high pass filters, and the output end of the N second drive amplifiers is connected with the input end of the N second PI attenuators.

[0106] The output end of the N second PI attenuators outputs the local oscillator signal with the set target power.

[0107] The single pole double throw switches SPST and the single pole multiple throw switches SPNT are used for quickly switching the local oscillator unit.

[0108] The low noise amplifier and the drive amplifier are used for amplifying the power of the local oscillator signal.

[0109] The power divider is used for splitting the local oscillator signal to realize the local oscillator of the multi-channel receiver.​

[0110] The first PI attenuator and the second PI attenuator are used for link impedance matching and local oscillator output power adjustment.

[0111] Working principle: The quick switching unit provided in the embodiment comprises, connected in sequence, an SPST, an SPNT (N≥2), a second low noise amplifier, a first PI attenuator, a power divider, a second high pass filter, a second drive amplifier, and a second PI attenuator.

[0112] The SPST is used to ensure the isolation degree between each local oscillator and prevent interference between the local oscillators.

[0113] The SPNT (N≥2) switches each local oscillator unit. The frequency quick switching power is realized by the combination of the SPST and the SPNT. If other multiple local oscillators need to be switched, the SPNT can be replaced, and N≥2.

[0114] The second low noise amplifier and the second drive amplifier are used to amplify the local oscillator signal power to ensure that the output power can normally drive the mixer.

[0115] The first PI attenuator and the second PI attenuator are used for high-frequency link matching and amplifier standing wave coefficient matching.

[0116] The power divider is used to split the local oscillator signal to adapt to the use demand of multiple channels of local oscillators.

[0117] The second high pass filter is used to filter out the fundamental frequency and part of the harmonic wave to ensure that the local oscillator output frequency is as clean as possible.

[0118] As shown in Figure 4 The structure schematic diagram of the quick switching unit part provided in the embodiment is shown in FIG. 1. The quick switching unit link part comprises an SPST, an SPNT (N≥2), a second low noise amplifier, a first PI attenuator, a power divider, a second high pass filter, a second drive amplifier, and a second PI attenuator. The local oscillator signal output by the frequency doubling unit passes through the SPST and the SPNT (N≥2). In this example, N=4, which realizes the quick switching function of each local oscillator unit. The low noise amplifier and the drive amplifier in the rear stage are used to amplify the local oscillator signal power. The first PI attenuator and the second PI attenuator are used for link impedance matching and local oscillator output power adjustment. The power divider in this embodiment is a 4-way power divider, which mainly splits the local oscillator signal to realize the local oscillator demand of a multiple channel receiver. The SPST and the SP4T in this embodiment have high isolation degree and quick response, etc. to realize the frequency switching time of each local oscillator ≤60 ns.

[0119] The other parts of the embodiment are the same as any one of the above-mentioned embodiments 1-4, and thus will not be described again.

[0120] Embodiment 6:

[0121] This embodiment is based on any one of the above-mentioned Embodiments 1-5, and as shown in Figure 1 The wideband fast switching local oscillator circuit further comprises a power supply and control module. The power supply module provides power supply for the normal operation of the local oscillator unit, the frequency multiplication unit and the fast switching unit.

[0122] The other parts of this embodiment are the same as any one of the above-mentioned Embodiments 1-5, and thus will not be described again.

[0123] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A wideband fast switching local oscillator circuit, coupled to a radio frequency receiver; characterized by, The N local oscillator units, N frequency multiplication units, a fast switching unit are included; The input end of the N local oscillator units inputs a reference clock source signal, and the output end is connected with the input end of the N frequency multiplication units; The input end of the fast switching unit is connected with the output end of the frequency multiplication unit, and the output end of the fast switching unit is connected with the radio frequency receiver; The N local oscillator units are used for generating low phase noise local oscillator signals according to the reference clock source signal; The N frequency multiplication units are used for frequency multiplication processing on the low phase noise local oscillator signals to generate high frequency local oscillator signals; The fast switching unit is used for rapidly switching the high frequency local oscillator signals to the same port.

2. The wideband fast switching local oscillator circuit of claim 1, wherein, The N local oscillator units each include an integrated phase-locked loop, a second low-pass filter and a first driving amplifier; The input end of the integrated phase-locked loop inputs the reference clock source signal, and the output end is connected with the input end of the second low-pass filter; The input end of the first driving amplifier is connected with the output end of the second low-pass filter, and the output end outputs the low phase noise local oscillator signal; The integrated phase-locked loop is used for generating a low phase noise and low spurious fundamental wave signal according to the reference clock source signal; The second low-pass filter is used for filtering the low phase noise and low spurious fundamental wave signal to obtain a filtered fundamental wave signal; The first driving amplifier is used for amplifying the fundamental wave signal to generate the low phase noise local oscillator signal.

3. The wideband fast switching local oscillator circuit of claim 2, wherein, The integrated phase-locked loop includes a phase detector, a first low-pass filter and a voltage-controlled oscillator; The input end of the phase detector inputs the reference clock source signal, and the output end is connected with the input end of the first low-pass filter; The output end of the first low-pass filter is connected with the input end of the voltage-controlled oscillator; The output end of the voltage-controlled oscillator is connected with the input end of the low-pass filter and the input end of the phase detector; The phase detector is used for generating a local oscillator phase error signal according to the reference clock source signal and a divided fundamental wave signal obtained from the voltage-controlled oscillator; The first low-pass filter is used for generating a control voltage signal according to the local oscillator phase error signal; The voltage-controlled oscillator is used for adjusting the signal frequency according to the control voltage signal to generate a low phase noise and low spurious fundamental wave signal.

4. The wideband fast switching local oscillator circuit of claim 1, wherein, The N frequency multiplication units include a frequency multiplier, a first high-pass filter and a first low-noise amplifier; The input end of the N frequency multipliers is connected with the output end of the N local oscillator units, and the output end of the N frequency multipliers is connected with the input end of the first high-pass filter; The input end of the first low-noise amplifier is connected with the output end of the high-pass filter, and the output end of the first low-noise amplifier is connected with the input end of the fast switching unit; The N frequency multipliers are used for frequency multiplication on the low phase noise and low spurious fundamental wave signal to generate local oscillator signals; The first high-pass filter is used for filtering the fundamental wave signal and the harmonic signal in the local oscillator signal; The first low-noise amplifier is used for amplifying the filtered local oscillator signal.

5. The wideband fast switching local oscillator circuit of claim 1, wherein, The fast switching unit includes N single-pole double-throw switches (SPST), a single-pole multiple-throw switch (SPNT), a second low-noise amplifier, a first PI attenuator, a power divider, N second high-pass filters, N second driving amplifiers and N second PI attenuators; The input end of the N single-pole double-throw switches SPST is connected with the output end of the frequency multiplication unit, and the output end of the N single-pole double-throw switches SPST is connected with the input end of the single-pole multi-throw switch SPNT; The input end of the second low-noise amplifier is connected with the output end of the single-pole multi-throw switch SPNT, and the output end of the second low-noise amplifier is connected with the input end of the first PI attenuator; The input end of the power divider is connected with the output end of the first PI attenuator, and the output end of the power divider is connected with the input end of the N second high-pass filters; The input end of the N second drive amplifiers is connected with the output end of the N second high-pass filters, and the output end of the N second drive amplifiers is connected with the input end of the N second PI attenuators; The output end of the N second PI attenuators outputs the local oscillator signal with a set target power; The single-pole double-throw switch SPST and the single-pole multi-throw switch SPNT are used for quickly switching the local oscillator unit; The low-noise amplifier and the drive amplifier are used for amplifying the power of the local oscillator signal; The power divider is used for splitting the local oscillator signal to realize a multi-channel receiver local oscillator; The first PI attenuator and the second PI attenuator are used for link impedance matching and local oscillator output power adjustment.

6. The wideband fast switching local oscillator circuit of claim 1, wherein, N local oscillator units generate N different frequency carrier signals.

7. The wideband fast switching local oscillator circuit of claim 1, wherein, The wideband fast switching local oscillator circuit further comprises a power module; The power module is connected with the input end of the local oscillator unit, the input end of the frequency multiplication unit and the input end of the fast switching unit.

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