CN105187059A - Wideband and low-phase noise local frequency synthesizing circuit and method - Google Patents
Wideband and low-phase noise local frequency synthesizing circuit and method Download PDFInfo
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Abstract
The invention provides a wideband and low-phase noise local frequency synthesizing circuit. The wideband and low-phase noise local frequency synthesizing circuit includes a direct digital frequency synthesizer, frequency multipliers, low-pass filters, high-pass filters, a band-pass filter, a quadrature mixer, a mixer, amplifiers, an integer frequency divider, a phase discriminator, a loop filter, a voltage-controlled oscillator and a coupler. According to the wideband and low-phase noise local frequency synthesizing circuit of the invention, high phase discrimination frequency is adopted perform phase discrimination, and therefore, phase noise deterioration of a loop can be decreased; the loop adopts the integer frequency divider, and therefore, the effects of the mantissa of fractional frequency division on phase noises can be eliminated; baseband signals generated by the direct digital frequency synthesizer are subjected to quadrature up-conversion, so that high-resolution, low-phase noise and high-frequency signals can be generated, and the high-frequency signals and the output of the voltage-controlled oscillator are subjected to mixing down-conversion, and signals obtained after the down-conversion can become signals with large step. Since the output of the voltage-controlled oscillator and the high-resolution and low-phase noise signals are subjected to the down-conversion, the input frequency of the integer frequency divider can be reduced, and the frequency division ratio of integer frequency division can be decreased.
Description
Technical field
The present invention relates to radio frequency and microwave regime, particularly a kind of broadband Low phase noise local frequency combiner circuit, also relate to a kind of broadband Low phase noise local frequency synthetic method.
Background technology
Spectrum analysis technique is the very important analytical method of radio frequency and microwave regime, in the design of modern spectrum analyzer, mostly adopts super-heterodyne technique, and therefore, its local oscillation signal, particularly the first local oscillation signal, directly determine the performance of spectrum analyzer.Adopt PHASE-LOCKED LOOP PLL TECHNIQUE can improve the noiseproof feature of local oscillation signal greatly, thus improve the test performance of spectrum analyzer.
The development of frequency synthesis technique is formed primarily of traditional analog direct synthesizer, the indirect frequency synthesizer of phase-locked loop, Direct Digital Frequency Synthesizers three phases, and the index of its output signal is more and more higher, and the technical sophistication degree of realization is also more and more higher.The hybrid mode that existing frequency synthesis mode mainly contains direct mode, indirect mode, digital form and this three kinds of modes combined.
Tradition Direct frequency synthesizer, utilizes circuit devcie to the adding of signal frequency exactly, subtracts, mode that multiplication and division arithmetic function produces new signal frequency.
PLL frequency synthesize mode, improves phase of output signal noise by the phase noise of synthesis phase discrimination signal and voltage controlled oscillator, utilizes loop filter to suppress phase demodulation spuious.
The hybrid frequency synthesizer etc. that current frequency synthesis technique has dicyclo or many rings frequency synthesizer of phase locking, phase-locked loop adds Direct Digital Frequency Synthesizers.
In prior art, the impact using a harmonic wave Sampling frequency mixer to reduce loop divider to bring; As the local oscillator excitation signal of harmonic wave Sampling frequency mixer, because the highest frequency multiplication that needs is to tens times, therefore first-harmonic needs fabulous phase noise specifications.Direct digital synthesis technique (DDS) is owing to having fabulous index of making an uproar mutually (depending on input reference signal) and very high frequency resolution, as the variable reference signal of phase-locked loop circuit, thus voltage controlled oscillator (VCO) output signal of optional frequency can be obtained.
As shown in Figure 1, whole circuit can be divided into sampling loop, DDS, preset adjustment loop, several part such as main phase-locked loop.
Sampling loop by sampling voltage controlled oscillator, the first amplifier, frequency mixer, sampling ring phase discriminator, sampling circle filtering several major part form, its function is to provide the input local oscillation signal of sampling mixing with cline frequency scope, good phases noise, sends into the sampling frequency mixer of main ring after the second amplifier.
Direct Digital Frequency Synthesizers (DDS) part, the reference signal of input is successively through integer frequency device, the first band pass filter, the second amplifier, and Direct Digital Frequency Synthesizers, the 3rd amplifier, the second band pass filter produce the phase discriminator input signal of main phase-locked loop and preset adjustment loop.
Preset adjustment loop segments, comprise the second coupler, the second integer frequency divider, the 4th integer frequency divider, preset ring phase discriminator, preset circle filtering, preset ring switch, by the switching of main ring switch and preset ring switch, the frequency of main voltage controlled oscillator is tuned near required frequency in advance, in order to avoid there is losing lock and wrong lock during main ring work.
The main voltage controlled oscillator output frequency of main phase-locked loop is coupled out Partial Power through the first integer frequency divider by the first coupler, sampling frequency mixer is entered again after low pass filter, the 6th amplifier, with the mixing together with sample in frequency mixer of the signal from sampling loop, the signal produced through the 3rd band pass filter, the 5th amplifier with from the phase demodulation input signal of DDS at main ring phase discriminator phase demodulation, phase demodulation exports and controls main voltage controlled oscillator through main ring filtering, main ring switch etc. again.
Prior art adopts many rings frequency synthesizer of phase locking to realize broadband Low phase noise local frequency synthesis, circuit is divided into sampling loop, Direct Digital Frequency Synthesizers (DDS), preset adjustment loop, main phase-locked loop etc., circuit complexity is very high, cost is high, debugging difficulty is large, and the locking of each Frequency point needs to control each several part circuit, and switch preset adjustment loop and main phase-locked loop, control too complicated.
Summary of the invention
For solving the deficiencies in the prior art, the present invention proposes a kind of broadband Low phase noise local frequency combiner circuit and method, monocycle Phase locking frequency synthesis loop is adopted to add Direct Digital Frequency Synthesizers, no longer need sampling local oscillation frequency synthesizer loop, preset adjustment secondary ring, circuit is simple, cost is low, easily debug.
Technical scheme of the present invention is achieved in that
A kind of broadband Low phase noise local frequency combiner circuit, is divided into three tunnels, is sent to the first frequency multiplier, the second frequency multiplier and Direct Digital Frequency Synthesizers respectively by input signal;
The road signal being sent to the first frequency multiplier after the first frequency multiplier, the first amplifier, the first high pass filter, the second amplifier as the local oscillation signal of orthogonal mixer;
Be sent to a road signal of the second frequency multiplier, after frequency multiplication, generate the phase demodulation reference frequency signal of phase-locked loop again through the second high pass filter;
The reference frequency signal being sent to Direct Digital Frequency Synthesizers after the inner frequency multiplication of Direct Digital Frequency Synthesizers as the reference clock of Direct Digital Frequency Synthesizers, generate the digital orthogonal baseband signal that two-way frequency same phase difference is 90 degree, two-way baseband signal is respectively through after the first low pass filter and the second low pass filter filtering reference clock signal, input to I road and the input of Q road of orthogonal mixer, the output signal of orthogonal mixer inputs to frequency mixer after band pass filter;
The output signal of voltage controlled oscillator is coupled out Partial Power by coupler, as the local oscillation signal of frequency mixer after the 3rd amplifier, with the radiofrequency signal down-conversion from band pass filter, the intermediate-freuqncy signal that frequency mixer exports enters phase discriminator after the 4th amplifier, the 3rd low pass filter, integer frequency divider, carry out tuning voltage controlled oscillator with from after the phase demodulation reference frequency signal phase demodulation of the second high pass filter through loop filter, make the Frequency Locking of voltage controlled oscillator in the frequency arranged.
Alternatively, be sent to a road signal of the first frequency multiplier, after frequency multiplication, filtering, amplification, the mutually orthogonal baseband signal of the two-way generated with Direct Digital Frequency Synthesizers carries out mixing at orthogonal mixer, after orthogonal mixer local frequency quadrature up-conversion, the frequency range of output signal is that frequency, bandwidth are 2 times of maximum base-band signal frequencies centered by orthogonal mixer local frequency.
Alternatively, the frequency resolution of described orthogonal mixer output signal depends on the base-band signal frequency resolution that Direct Digital Frequency Synthesizers exports.
Alternatively, the output signal elder generation of voltage controlled oscillator and the output signal down-conversion of orthogonal mixer, after frequency conversion, frequency step is the maximum base-band signal frequency of 2 times, the maximum base-band signal frequency of 2 times that signal after frequency mixer down-conversion is fixed after integer frequency divider, the reference frequency of phase discriminator is the maximum base-band signal frequency of 2 times, is obtained the frequency multiplication multiple of the second frequency multiplier by the reference frequency of phase discriminator.
Alternatively, if reference frequency is FR, the frequency multiplication multiple of the first frequency multiplier is integer D1, the frequency multiplication multiple of the second frequency multiplier is integer D2, and the output frequency of Direct Digital Frequency Synthesizers is FBB, and the frequency dividing ratio of integer frequency divider is Integer N, the locking output frequency of voltage controlled oscillator is F, then:
F＝FR*D1+FR*D2*N±FBB
In order to the locking output frequency realizing voltage controlled oscillator covers continuously with minimum frequency resolution in voltage controlled oscillator hunting range, the frequency range of FBB is 0 ~ (FR*D2)/2.
Present invention also offers a kind of broadband Low phase noise local frequency synthetic method, input signal is divided into three tunnels, is sent to the first frequency multiplier, the second frequency multiplier and Direct Digital Frequency Synthesizers respectively;
Be sent to a road signal of the first frequency multiplier, after frequency multiplication, filtering, amplification, the mutually orthogonal baseband signal of the two-way generated with Direct Digital Frequency Synthesizers carries out mixing at orthogonal mixer, after orthogonal mixer local frequency quadrature up-conversion, input to band pass filter;
Be sent to a road signal of the second frequency multiplier, after frequency multiplication, generate the phase demodulation reference frequency signal of phase-locked loop again through the second high pass filter;
The reference frequency signal being sent to Direct Digital Frequency Synthesizers after the inner frequency multiplication of Direct Digital Frequency Synthesizers as the reference clock of Direct Digital Frequency Synthesizers, produce the digital orthogonal baseband signal that two-way frequency same phase difference is 90 degree, two-way baseband signal is respectively through after the first low pass filter and the second low pass filter filtering reference clock signal, input to I road and the input of Q road of orthogonal mixer, the output signal of orthogonal mixer inputs to frequency mixer after band pass filter;
The output signal of voltage controlled oscillator is coupled out Partial Power by coupler, as the local oscillation signal of frequency mixer after the 3rd amplifier, with the radiofrequency signal down-conversion from band pass filter, the intermediate-freuqncy signal that frequency mixer exports enters phase discriminator after the 4th amplifier, the 3rd low pass filter, integer frequency divider, carry out tuning voltage controlled oscillator with from after the phase demodulation reference frequency signal phase demodulation of the second high pass filter through loop filter, make the Frequency Locking of voltage controlled oscillator in the frequency arranged.
Alternatively, the frequency range of described orthogonal mixer output signal is that frequency, bandwidth are 2 times of maximum base-band signal frequencies centered by orthogonal mixer local frequency.
Alternatively, the frequency resolution of described orthogonal mixer output signal depends on the base-band signal frequency resolution that Direct Digital Frequency Synthesizers exports.
Alternatively, the output signal elder generation of voltage controlled oscillator and the output signal down-conversion of orthogonal mixer, after frequency conversion, frequency step is the maximum base-band signal frequency of 2 times, the maximum base-band signal frequency of 2 times that signal after frequency mixer down-conversion is fixed after integer frequency divider, the reference frequency of phase discriminator is the maximum base-band signal frequency of 2 times, is obtained the frequency multiplication multiple of the second frequency multiplier by the reference frequency of phase discriminator.
Alternatively, if reference frequency is FR, the frequency multiplication multiple of the first frequency multiplier is integer D1, the frequency multiplication multiple of the second frequency multiplier is integer D2, and the output frequency of Direct Digital Frequency Synthesizers is FBB, and the frequency dividing ratio of integer frequency divider is Integer N, the locking output frequency of voltage controlled oscillator is F, then:
F＝FR*D1+FR*D2*N±FBB
In order to the locking output frequency realizing voltage controlled oscillator covers continuously with minimum frequency resolution in voltage controlled oscillator hunting range, the frequency range of FBB is 0 ~ (FR*D2)/2.
The invention has the beneficial effects as follows:
(1) simplify circuit design, no longer need sampling local oscillation frequency synthesizer loop, preset adjustment secondary ring, circuit is simple, cost is low, easily debug, the software control of circuit is simple;
(2) adopt frequency mixer to reduce the incoming frequency of integer frequency divider, thus reduce the frequency dividing ratio of integral frequency divisioil, and do not need preset adjustment secondary ring;
(3) do not adopt the method for sampling mixing, eliminate sampling local oscillation frequency synthesizer loop;
(4) realization of low phase noise, except adopting frequency mixer down-conversion to lower except integer frequency divider incoming frequency, additionally using high phase comparison frequency and carrying out phase demodulation, reducing frequency dividing ratio;
(5) in order to realize integral frequency divisioil, the frequency mixer before frequency division, voltage controlled oscillator exports and carries out mixing with a high-resolution Low phase noise high-frequency signal;
(6) high-frequency signal of high-resolution Low phase noise is realized by the mode of quadrature up-conversion.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is many ring locks phase local frequency combiner circuit schematic diagram in prior art;
Fig. 2 broadband of the present invention Low phase noise local frequency combiner circuit schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 2, broadband of the present invention Low phase noise local frequency combiner circuit comprises: Direct Digital Frequency Synthesizers, frequency multiplier, low pass filter, high pass filter, band pass filter, orthogonal mixer, frequency mixer, amplifier, integer frequency divider, phase discriminator, loop filter, voltage controlled oscillator, coupler.
As shown in Figure 2, input signal is divided into three tunnels by broadband of the present invention Low phase noise local frequency combiner circuit, is sent to the first frequency multiplier, the second frequency multiplier and Direct Digital Frequency Synthesizers respectively.
The road signal being sent to the first frequency multiplier after the first frequency multiplier, the first amplifier, the first high pass filter, the second amplifier as the local oscillation signal of orthogonal mixer.
Be sent to a road signal of the second frequency multiplier, after frequency multiplication, generate the phase demodulation reference frequency signal of phase-locked loop again through the second high pass filter.
The reference frequency being sent to Direct Digital Frequency Synthesizers after the inner frequency multiplication of Direct Digital Frequency Synthesizers as the reference clock of Direct Digital Frequency Synthesizers, generate the digital orthogonal baseband signal that two-way frequency same phase difference is 90 degree, two-way baseband signal, respectively through after the first low pass filter and the second low pass filter filtering reference clock signal, inputs to I road and the input of Q road of orthogonal mixer.
The output signal of orthogonal mixer inputs to frequency mixer after band pass filter.
The output signal of voltage controlled oscillator is coupled out fraction power local oscillation signal as frequency mixer after the 3rd amplifier by coupler, with the radiofrequency signal down-conversion from band pass filter, the intermediate frequency that frequency mixer exports enters phase discriminator after the 4th amplifier, the 3rd low pass filter, integer frequency divider, carry out tuning voltage controlled oscillator with from after the phase demodulation reference frequency signal phase demodulation of the second high pass filter through loop filter, make the Frequency Locking of voltage controlled oscillator in the frequency arranged.
Broadband of the present invention Low phase noise local frequency combiner circuit operation principle is:
Be sent to a road signal of the first frequency multiplier, after frequency multiplication, filtering, amplification, the mutually orthogonal baseband signal of the two-way generated with Direct Digital Frequency Synthesizers carries out mixing at orthogonal mixer, after orthogonal mixer local frequency quadrature up-conversion, the frequency range of output signal is that frequency, bandwidth are 2 times of maximum base-band signal frequencies centered by orthogonal mixer local frequency, and the frequency resolution of output signal depends on the base-band signal frequency resolution that Direct Digital Frequency Synthesizers exports.
The output elder generation of voltage controlled oscillator and the output signal down-conversion of orthogonal mixer, after frequency conversion, frequency step is the maximum base-band signal frequency of 2 times, the maximum base-band signal frequency of 2 times that signal after frequency mixer down-conversion is fixed after integer frequency divider, the reference frequency of phase discriminator is the maximum base-band signal frequency of 2 times, can be obtained the frequency multiplication multiple of the second frequency multiplier by the reference frequency of phase discriminator.
If reference frequency is FR, the frequency multiplication multiple of the first frequency multiplier is integer D1, and the frequency multiplication multiple of the second frequency multiplier is integer D2, the output frequency of Direct Digital Frequency Synthesizers is FBB, the frequency dividing ratio of integer frequency divider is Integer N, and the locking output frequency of voltage controlled oscillator is F, then:
F＝FR*D1+FR*D2*N±FBB
In order to the locking output frequency realizing voltage controlled oscillator covers continuously with minimum frequency resolution in voltage controlled oscillator hunting range, the frequency range of FBB is 0 ~ (FR*D2)/2.
Local frequency synthetic method phase demodulation frequency of the present invention is higher, performance of making an uproar mutually is better, namely FR*D2 is higher, the frequency dividing ratio of integer frequency divider is less, the phase noise of output frequency is lower, but along with the increase of FR*D2, the frequency range of FBB also can broaden, also higher to the performance requirement of Direct Digital Frequency Synthesizers.
The present invention adds Direct Digital Frequency Synthesizers (DDS) by monocycle frequency synthesizer of phase locking and realizes broadband Low phase noise local frequency synthesis, high resolution frequency signal exports the radiofrequency signal of down-conversion as voltage controlled oscillator (VCO), solves and realizes the circuit that broadband Low phase noise local frequency is synthesized and the problem controlling too complexity by many rings frequency synthesizer of phase locking.
The present invention adopts monocycle frequency synthesizer of phase locking, and no longer need sampling local oscillation frequency synthesizer loop, preset adjustment secondary ring, simplifies circuit structure, and cost is low, easily debug, and the software control of circuit is simple.
Prior art have employed sampling mixing, locking in losing lock, adding preset adjustment secondary ring to there is not mistake, and the present invention adopts frequency mixer to be fundamental mixer, reduce the incoming frequency of integer frequency divider, thus reduce the frequency dividing ratio of integral frequency divisioil, and do not need preset adjustment secondary ring.Owing to not adopting the method for sampling mixing, also eliminate sampling local oscillation frequency synthesizer loop.
The realization of low phase noise of the present invention, except adopting frequency mixer down-conversion to lower except integer frequency divider incoming frequency, additionally using high phase comparison frequency and carrying out phase demodulation, reducing frequency dividing ratio.
The present invention is in order to realize integral frequency divisioil, and the frequency mixer before frequency division, voltage controlled oscillator exports and carries out mixing with a high-resolution Low phase noise high-frequency signal, obtains the variable frequency signal that frequency interval is larger.The present invention by after variable frequency signal integral frequency divisioil larger for frequency interval with phase demodulation reference frequency phase demodulation, after phase demodulation through loop filter control voltage controlled oscillator (VCO) realize Frequency Locking.The high-frequency signal of high-resolution Low phase noise is realized by the mode of quadrature up-conversion.
The present invention does not need to calculate sampling local frequency, parameter such as sampling number of times, preset voltage etc. according to local frequency, simplifies FREQUENCY CONTROL flow process.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a broadband Low phase noise local frequency combiner circuit, is characterized in that, input signal is divided into three tunnels, is sent to the first frequency multiplier, the second frequency multiplier and Direct Digital Frequency Synthesizers respectively;
The road signal being sent to the first frequency multiplier after the first frequency multiplier, the first amplifier, the first high pass filter, the second amplifier as the local oscillation signal of orthogonal mixer;
Be sent to a road signal of the second frequency multiplier, after frequency multiplication, generate the phase demodulation reference frequency signal of phase-locked loop again through the second high pass filter;
The reference frequency signal being sent to Direct Digital Frequency Synthesizers after the inner frequency multiplication of Direct Digital Frequency Synthesizers as the reference clock of Direct Digital Frequency Synthesizers, generate the digital orthogonal baseband signal that two-way frequency same phase difference is 90 degree, two-way baseband signal is respectively through after the first low pass filter and the second low pass filter filtering reference clock signal, input to I road and the input of Q road of orthogonal mixer, the output signal of orthogonal mixer inputs to frequency mixer after band pass filter;
The output signal of voltage controlled oscillator is coupled out Partial Power by coupler, as the local oscillation signal of frequency mixer after the 3rd amplifier, with the radiofrequency signal down-conversion from band pass filter, the intermediate-freuqncy signal that frequency mixer exports enters phase discriminator after the 4th amplifier, the 3rd low pass filter, integer frequency divider, carry out tuning voltage controlled oscillator with from after the phase demodulation reference frequency signal phase demodulation of the second high pass filter through loop filter, make the Frequency Locking of voltage controlled oscillator in the frequency arranged.
2. a kind of broadband as claimed in claim 1 Low phase noise local frequency combiner circuit, it is characterized in that, be sent to a road signal of the first frequency multiplier, after frequency multiplication, filtering, amplification, the mutually orthogonal baseband signal of the two-way generated with Direct Digital Frequency Synthesizers carries out mixing at orthogonal mixer, after orthogonal mixer local frequency quadrature up-conversion, the frequency range of output signal is that frequency, bandwidth are 2 times of maximum base-band signal frequencies centered by orthogonal mixer local frequency.
3. a kind of broadband as claimed in claim 2 Low phase noise local frequency combiner circuit, is characterized in that, the frequency resolution of described orthogonal mixer output signal depends on the base-band signal frequency resolution that Direct Digital Frequency Synthesizers exports.
4. a kind of broadband as claimed in claim 1 Low phase noise local frequency combiner circuit, it is characterized in that, the output signal elder generation of voltage controlled oscillator and the output signal down-conversion of orthogonal mixer, after frequency conversion, frequency step is the maximum base-band signal frequency of 2 times, the maximum base-band signal frequency of 2 times that signal after frequency mixer down-conversion is fixed after integer frequency divider, the reference frequency of phase discriminator is the maximum base-band signal frequency of 2 times, is obtained the frequency multiplication multiple of the second frequency multiplier by the reference frequency of phase discriminator.
5. a kind of broadband as claimed in claim 1 Low phase noise local frequency combiner circuit, is characterized in that,
If reference frequency is FR, the frequency multiplication multiple of the first frequency multiplier is integer D1, and the frequency multiplication multiple of the second frequency multiplier is integer D2, the output frequency of Direct Digital Frequency Synthesizers is FBB, the frequency dividing ratio of integer frequency divider is Integer N, and the locking output frequency of voltage controlled oscillator is F, then:
F＝FR*D1+FR*D2*N±FBB
In order to the locking output frequency realizing voltage controlled oscillator covers continuously with minimum frequency resolution in voltage controlled oscillator hunting range, the frequency range of FBB is 0 ~ (FR*D2)/2.
6. a broadband Low phase noise local frequency synthetic method, is characterized in that, input signal is divided into three tunnels, is sent to the first frequency multiplier, the second frequency multiplier and Direct Digital Frequency Synthesizers respectively;
Be sent to a road signal of the first frequency multiplier, after frequency multiplication, filtering, amplification, the mutually orthogonal baseband signal of the two-way generated with Direct Digital Frequency Synthesizers carries out mixing at orthogonal mixer, after orthogonal mixer local frequency quadrature up-conversion, input to band pass filter;
Be sent to a road signal of the second frequency multiplier, after frequency multiplication, generate the phase demodulation reference frequency signal of phase-locked loop again through the second high pass filter;
The reference frequency signal being sent to Direct Digital Frequency Synthesizers after the inner frequency multiplication of Direct Digital Frequency Synthesizers as the reference clock of Direct Digital Frequency Synthesizers, produce the digital orthogonal baseband signal that two-way frequency same phase difference is 90 degree, two-way baseband signal is respectively through after the first low pass filter and the second low pass filter filtering reference clock signal, input to I road and the input of Q road of orthogonal mixer, the output signal of orthogonal mixer inputs to frequency mixer after band pass filter;
The output signal of voltage controlled oscillator is coupled out Partial Power by coupler, as the local oscillation signal of frequency mixer after the 3rd amplifier, with the radiofrequency signal down-conversion from band pass filter, the intermediate-freuqncy signal that frequency mixer exports enters phase discriminator after the 4th amplifier, the 3rd low pass filter, integer frequency divider, carry out tuning voltage controlled oscillator with from after the phase demodulation reference frequency signal phase demodulation of the second high pass filter through loop filter, make the Frequency Locking of voltage controlled oscillator in the frequency arranged.
7. a kind of broadband as claimed in claim 6 Low phase noise local frequency synthetic method, is characterized in that,
The frequency range of described orthogonal mixer output signal is that frequency, bandwidth are 2 times of maximum base-band signal frequencies centered by orthogonal mixer local frequency.
8. a kind of broadband as claimed in claim 7 Low phase noise local frequency synthetic method, is characterized in that, the frequency resolution of described orthogonal mixer output signal depends on the base-band signal frequency resolution that Direct Digital Frequency Synthesizers exports.
9. a kind of broadband as claimed in claim 6 Low phase noise local frequency synthetic method, it is characterized in that, the output signal elder generation of voltage controlled oscillator and the output signal down-conversion of orthogonal mixer, after frequency conversion, frequency step is the maximum base-band signal frequency of 2 times, the maximum base-band signal frequency of 2 times that signal after frequency mixer down-conversion is fixed after integer frequency divider, the reference frequency of phase discriminator is the maximum base-band signal frequency of 2 times, is obtained the frequency multiplication multiple of the second frequency multiplier by the reference frequency of phase discriminator.
10. a kind of broadband as claimed in claim 6 Low phase noise local frequency synthetic method, is characterized in that,
If reference frequency is FR, the frequency multiplication multiple of the first frequency multiplier is integer D1, and the frequency multiplication multiple of the second frequency multiplier is integer D2, the output frequency of Direct Digital Frequency Synthesizers is FBB, the frequency dividing ratio of integer frequency divider is Integer N, and the locking output frequency of voltage controlled oscillator is F, then:
F＝FR*D1+FR*D2*N±FBB
In order to the locking output frequency realizing voltage controlled oscillator covers continuously with minimum frequency resolution in voltage controlled oscillator hunting range, the frequency range of FBB is 0 ~ (FR*D2)/2.
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