CN105119597A - Wideband low-noise signal generator based on medium-frequency amplitude-limiting circuit - Google Patents
Wideband low-noise signal generator based on medium-frequency amplitude-limiting circuit Download PDFInfo
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- CN105119597A CN105119597A CN201510458921.7A CN201510458921A CN105119597A CN 105119597 A CN105119597 A CN 105119597A CN 201510458921 A CN201510458921 A CN 201510458921A CN 105119597 A CN105119597 A CN 105119597A
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- amplitude limiter
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- limiter circuit
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Abstract
The invention discloses a wideband low-noise signal generator based on a medium-frequency amplitude-limiting circuit. The wideband low-noise signal generator is characterized by comprising a phase discriminator, a low pass filter, a wideband voltage-controlled oscillator, a mixer and the medium-frequency amplitude-limiting circuit. The phase discriminator is connected with the low pass filter. The low pass filter is connected with the wideband voltage-controlled oscillator. The wideband voltage-controlled oscillator is connected with the mixer. The mixer is connected with the medium-frequency amplitude-limiting circuit. The medium-frequency amplitude-limiting circuit is connected with the phase discriminator. The phase discriminator, the low pass filter, the wideband voltage-controlled oscillator, the mixer and the medium-frequency amplitude-limiting circuit form a wideband frequency-mixing phase locked loop. Low-noise reference signals are input to the input end of the phase discriminator. Low-noise local oscillator signals are input to the mixer. The wideband voltage-controlled oscillator outputs wideband low-noise signals. The medium-frequency amplitude-limiting circuit controls medium-frequency signals output by the mixer in conditions with different output frequencies of the wideband voltage-controlled oscillator to be in a unified power level. The influence of medium-frequency signal power fluctuations on the wideband frequency-mixing phase locked loop gain and loop bandwidth can be eliminated.
Description
Technical field
The present invention relates to a kind of wideband low noise signal generator, especially a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit.
Background technology
Along with the development of modern radar and radio communication technology etc., various electronic equipment constantly proposes higher requirement to the signal generator that its internal applications or system testing use, and one is that bandwidth is increasing, and two is will have extremely low output power single sideband phase noise exactly.
RF/Microwave voltage controlled oscillator (VCO) output signal that frequency is higher has good far-end phase noise, but near-end noise is all poor, usually adopts phase-locked loop to be locked on low noise reference signal by VCO to improve near-end noise.For single point signal generator frequently, directly adopt the phase-locked loop circuit of reference signal frequency multiplication or VCO feedback signal frequency division to be all easy to realize, but for the broadband signal generator of multiple rate-adaptive pacemaker, then cannot use this circuit.Current wideband low noise signal generator adopts mixing Phase Lock Technique usually, namely by frequency mixer by the intermediate-freuqncy signal of the signal frequency conversion of broadband VCO to low frequency, then with low noise reference signal phase demodulation, obtain low noise VCO and output signal.As shown in Figure 1.
Based in the broadband signal generator of Mixing PLL, intermediate-freuqncy signal is subject to the impact of VCO feedback signal and mixing local oscillation signal watt level, during different frequency, watt level differs, and the power of intermediate-freuqncy signal directly affects loop gain, loop bandwidth is differed, affects the noise of phase-locked rear signal.Existing solution is the loop gain regulating resistance different to different frequency usage, because the resistance of this resistance affects loop gain, selects suitable resistance can offset the impact of intermediate-freuqncy signal power on loop gain.Fig. 2 is " low pass filter " part of Fig. 1, and adopt active low-pass filter, what be connected with selector switch is loop gain regulating circuit, and selector switch controls different resistance can realize different loop gains.
The shortcoming of prior art is that circuit is complicated, debugging work load is large.
Prior art is when the EF power of VCO different frequent points differs greatly, each frequency has a corresponding gain setting resistor, the switch of multiple resistance and multichannel is needed to select control circuit, if frequency is more than ten, and during EF power big rise and fall the method need resistance quantity and switching circuit can be very huge, and frequency is more, circuit is huger, very complicated, when frequency reaches tens, the method almost can not realize, can only use when the phase-locked frequency of VCO is less in this way.
Balance the impact of EF power on loop gain with gain setting resistor, each frequency needs the resistance being determined gain setting resistor by debugging, and debugging work load is very large.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention proposes a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit.Unify intermediate-freuqncy signal power by amplitude limiter circuit, not by the quantitative limitation of VCO frequency number, the fluctuating that can be good at solving EF power affects the problem of loop bandwidth.
The present invention adopts following technical scheme:
A kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit, comprise phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit, phase discriminator connects low pass filter, low pass filter connects wideband voltage controlled oscillator, wideband voltage controlled oscillator connects frequency mixer, frequency mixer connects intermediate frequency amplitude limiter circuit, intermediate frequency amplitude limiter circuit connects phase discriminator, phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit composition Mixing PLL road, broadband;
Phase discriminator input input low noise reference signal, frequency mixer input has low noise local oscillation signal, wideband voltage controlled oscillator exports wideband low noise signal, frequency mixer under different for wideband voltage controlled oscillator output frequency is exported intermediate-freuqncy signal and controls in unified power level by intermediate frequency amplitude limiter circuit, and the floating eliminating intermediate-freuqncy signal power is on the impact of broadband Mixing PLL road gain and loop bandwidth.
Preferably, described intermediate frequency amplitude limiter circuit comprises the amplifying circuit, amplitude limiter circuit and the filter circuit that connect successively.
Preferably, described amplifying circuit by intermediate-freuqncy signal power amplification to the maximum power value that can pass through higher than amplitude limiter circuit;
The gain of amplifying circuit is determined according to the minimum power of intermediate-freuqncy signal, namely intermediate-freuqncy signal minimum for power is amplified to the maximum power value that can pass through higher than amplitude limiter circuit.
Preferably, the amplitude of the intermediate-freuqncy signal after amplifying through amplifying circuit is restricted to fixing level by described amplitude limiter circuit;
Amplitude limiter circuit comprises the fast recovery rectifier diode of two positive and negative both direction ground connection.
Preferably, the harmonic wave of the intermediate-freuqncy signal after amplitude limiter circuit amplitude limit suppresses by described filter circuit.
Preferably, be connected with attenuator circuit between described intermediate frequency amplitude limiter circuit and phase discriminator, intermediate-freuqncy signal is decayed to the optimum power level of phase discriminator by attenuator circuit.
The Advantageous Effects adopting as above technical scheme to obtain is:
Frequency mixer under different for wideband voltage controlled oscillator output frequency is exported intermediate-freuqncy signal and controls in unified power level by intermediate frequency amplitude limiter circuit of the present invention, and the floating eliminating intermediate-freuqncy signal power is on the impact of broadband Mixing PLL road gain and loop bandwidth.Make the bandwidth of broadband mixing phase lock circuitry control to become very easy, favourablely ensure that in broadband, each point all has low-noise characteristic.
Accompanying drawing explanation
Fig. 1 is existing wideband low noise signal generator.
Fig. 2 is a kind of implementation of low pass filter in Fig. 1.
Fig. 3 is the wideband low noise signal generator based on intermediate frequency amplitude limiter circuit.
Fig. 4 is a kind of implementation of the amplitude limiter circuit of intermediate frequency shown in Fig. 3.
Embodiment
3 to 4 pairs of the specific embodiment of the present invention are described further by reference to the accompanying drawings:
A kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit, comprise phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit, phase discriminator connects low pass filter, low pass filter connects wideband voltage controlled oscillator, wideband voltage controlled oscillator connects frequency mixer, frequency mixer connects intermediate frequency amplitude limiter circuit, intermediate frequency amplitude limiter circuit connects phase discriminator, phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit composition Mixing PLL road, broadband, as shown in Figure 3.Phase discriminator input input low noise reference signal, frequency mixer input has low noise local oscillation signal, wideband voltage controlled oscillator exports wideband low noise signal, frequency mixer under different for wideband voltage controlled oscillator output frequency is exported intermediate-freuqncy signal and controls in unified power level by intermediate frequency amplitude limiter circuit, and the floating eliminating intermediate-freuqncy signal power is on the impact of broadband Mixing PLL road gain and loop bandwidth.
As shown in Figure 4, intermediate frequency amplitude limiter circuit comprises the amplifying circuit, amplitude limiter circuit and the filter circuit that connect successively.
Wideband voltage controlled oscillator directly export or power through amplifying circuit amplifying signal generally not of uniform size, be generally that high frequency power is little and low frequency power is large, the frequency response of oscillator output signal power and amplifier gain frequency response are not always the case, and low noise local oscillation signal is according to the different frequency responses of synthesis mode difference to some extent, but all can not be very good, the intermediate-freuqncy signal floating that these factors result in frequency mixer output is very large.
Amplifying circuit by intermediate-freuqncy signal power amplification to the maximum power value that can pass through higher than amplitude limiter circuit.The gain of amplifying circuit is determined according to the minimum power of intermediate-freuqncy signal, namely intermediate-freuqncy signal minimum for power is amplified to the maximum power value that can pass through higher than amplitude limiter circuit.As amplitude limiter circuit adopts the diode of 0.7V conducting voltage, intermediate-freuqncy signal will be amplified to higher than 10dBm.The gain of amplifying circuit is determined according to the minimum power of intermediate-freuqncy signal, intermediate frequency minimum for power must be amplified to higher than 10dBm.
The amplitude of the intermediate-freuqncy signal after amplifying through amplifying circuit is restricted to fixing level by amplitude limiter circuit; Amplitude limiter circuit comprises the fast recovery rectifier diode of two positive and negative both direction ground connection.
As amplitude limiter circuit adopts two fast-recovery commutation diodes, both forward and reverse directions ground connection, conducting voltage is about 0.7V, because the peak-to-peak value of intermediate-freuqncy signal is all greater than 0.7V, so the amplitude peak of intermediate-freuqncy signal is limited in 0.7V by two diodes, time domain is seen by the sine wave of peak clipping, and frequency domain is seen and is that harmonic wave worsens but fundamental power is unified is about 10dBm.The larger peak clipping of intermediate frequency power before amplitude limit is more serious, and harmonic wave worsens also more serious, but fundamental power is the same.
The harmonic wave of the intermediate-freuqncy signal after amplitude limiter circuit amplitude limit suppresses by filter circuit.Because the harmonic wave of intermediate-freuqncy signal has impact to phase discriminator, filtering must be carried out.Intermediate-freuqncy signal after filtering just reaches real power unification, and the intermediate-freuqncy signal difference no matter frequency mixer exports is much, and after intermediate frequency amplitude limiter circuit, not only power is unified, and harmonic wave also difference is little, meets not to the requirement that loop bandwidth has an impact.
If necessary, can increase attenuator circuit between intermediate frequency amplitude limiter circuit and phase discriminator, intermediate-freuqncy signal is decayed to the optimum power level of phase discriminator by attenuator circuit.
Certainly; more than illustrate and be only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this specification; made all equivalently to substitute, obvious variant, within the essential scope all dropping on this specification, protection of the present invention ought to be subject to.
Claims (6)
1. the wideband low noise signal generator based on intermediate frequency amplitude limiter circuit, it is characterized in that, comprise phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit, phase discriminator connects low pass filter, low pass filter connects wideband voltage controlled oscillator, wideband voltage controlled oscillator connects frequency mixer, frequency mixer connects intermediate frequency amplitude limiter circuit, intermediate frequency amplitude limiter circuit connects phase discriminator, phase discriminator, low pass filter, wideband voltage controlled oscillator, frequency mixer and intermediate frequency amplitude limiter circuit composition Mixing PLL road, broadband;
Phase discriminator input input low noise reference signal, frequency mixer input has low noise local oscillation signal, wideband voltage controlled oscillator exports wideband low noise signal, frequency mixer under different for wideband voltage controlled oscillator output frequency is exported intermediate-freuqncy signal and controls in unified power level by intermediate frequency amplitude limiter circuit, and the floating eliminating intermediate-freuqncy signal power is on the impact of broadband Mixing PLL road gain and loop bandwidth.
2. a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit according to claim 1, it is characterized in that, described intermediate frequency amplitude limiter circuit comprises the amplifying circuit, amplitude limiter circuit and the filter circuit that connect successively.
3. a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit according to claim 2, is characterized in that, described amplifying circuit by intermediate-freuqncy signal power amplification to the maximum power value that can pass through higher than amplitude limiter circuit;
The gain of amplifying circuit is determined according to the minimum power of intermediate-freuqncy signal, namely intermediate-freuqncy signal minimum for power is amplified to the maximum power value that can pass through higher than amplitude limiter circuit.
4. a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit according to claim 2, is characterized in that, the amplitude of the intermediate-freuqncy signal after amplifying through amplifying circuit is restricted to fixing level by described amplitude limiter circuit;
Amplitude limiter circuit comprises the fast recovery rectifier diode of two positive and negative both direction ground connection.
5. a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit according to claim 2, it is characterized in that, the harmonic wave of the intermediate-freuqncy signal after amplitude limiter circuit amplitude limit suppresses by described filter circuit.
6. a kind of wideband low noise signal generator based on intermediate frequency amplitude limiter circuit according to claim 1, it is characterized in that, be connected with attenuator circuit between described intermediate frequency amplitude limiter circuit and phase discriminator, intermediate-freuqncy signal is decayed to the optimum power level of phase discriminator by attenuator circuit.
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| CN108282162A (en) * | 2017-01-06 | 2018-07-13 | 联咏科技股份有限公司 | The clock and data recovery circuit that jitter toleration improves |
| CN108549046A (en) * | 2018-05-23 | 2018-09-18 | 中国电子科技集团公司第四十研究所 | The automatic test approach of module occurs in broadband multiple spot reference signal for labview |
| CN110957743A (en) * | 2019-11-28 | 2020-04-03 | 三一重能有限公司 | Power grid low-frequency locking method and device, wind power converter and computer storage medium |
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| CN110957743B (en) * | 2019-11-28 | 2021-10-29 | 三一重能有限公司 | Power grid low-frequency locking method and device, wind power converter and computer storage medium |
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