CN108768392A - A kind of broadband high-precision frequency synthesizer and frequency combining method - Google Patents
A kind of broadband high-precision frequency synthesizer and frequency combining method Download PDFInfo
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- CN108768392A CN108768392A CN201810432499.1A CN201810432499A CN108768392A CN 108768392 A CN108768392 A CN 108768392A CN 201810432499 A CN201810432499 A CN 201810432499A CN 108768392 A CN108768392 A CN 108768392A
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- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000010189 synthetic method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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Abstract
The invention discloses a kind of broadband high-precision frequency synthesizers, including FPGA control circuit, the signal input part of FPGA control circuit connects external signal, the signal output end of FPGA control circuit connects DDS frequency generation circuits by level translator, the signal input part of the signal output end connection VCO frequency combiner circuit of DDS frequency generation circuits, the signal output end of VCO frequency combiner circuit is also separately connected DDS frequency generation circuits and VCO frequency combiner circuit by programmable amplifier connection signal output end, FPGA control circuit by control line.The broadband high-precision frequency synthesizer and frequency combining method of the present invention, can make output signal frequency range reach 10.9M~1.175GHz, precision can be consistent with DDS circuit precision, can be widely applied to the fields such as radar, instrument and meter.
Description
Technical field
The invention belongs to frequency synthesizer technique fields, and in particular to a kind of broadband high-precision frequency synthesizer and frequency
Synthetic method.
Background technology
With the development of electronic technology, the requirement to signal source is also higher and higher, is particularly applied to radar, test measures
Equal fields, the requirement to signal source are harsher.Currently, signal has the modes such as DDS, VCO, YIG to generate, with function
It is single, frequency range is narrow, signal is not clean enough, can not be program-controlled etc. disadvantages, the signal of local oscillator is particularly applied to, to signal stabilization
The characteristic requirements such as degree, frequency are high, and the prior art cannot achieve covers each rate-adaptive pacemaker, and output signal essence by an equipment
Degree is not high.
Invention content
It is an object of the invention to：Above-mentioned deficiency in the prior art is solved, a kind of broadband high-precision frequency conjunction is provided
It grows up to be a useful person and frequency combining method, so that output signal frequency range is reached 10.9M~1.175GHz, precision can be with DDS circuit precision
It is consistent, can be widely applied to the fields such as radar, instrument and meter.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of broadband high-precision frequency synthesizer, including FPGA control circuit, the signal of the FPGA control circuit are defeated
Enter end connection external signal, the signal output end of the FPGA control circuit connects DDS frequencies by level translator and generates electricity
Road, the signal input part of the signal output end connection VCO frequency combiner circuit of the DDS frequency generation circuits, the VCO frequency
The signal output end of combiner circuit also passes through control line by programmable amplifier connection signal output end, the FPGA control circuit
It is separately connected the DDS frequency generation circuits and the VCO frequency combiner circuit.
Further, above-mentioned VCO frequency combiner circuit includes and the sequentially connected frequency discrimination of DDS frequency generation circuits
The signal output end of phase discriminator, voltage controlled oscillator, frequency multiplier and frequency divider, the frequency multiplier is also connected with the phase frequency detector,
The signal output end of the frequency divider connects the programmable amplifier.
Further, above-mentioned DDS frequency generation circuits are connected with VCO frequency synthesis electricity by bandpass filter, described
It is connected, the phase frequency detector and voltage-controlled is shaken by the first low-pass filter between VCO frequency combiner circuit and programmable amplifier
It swings and is connected by the second low-pass filter between device, pass through third low-pass filtering between the programmable amplifier and signal output end
Device connect, the bandpass filter be 30-50MHz bandpass filters, first low-pass filter, the second low-pass filter and
Third low-pass filter is 1.2GHz low-pass filters.
Further, above-mentioned DDS frequency generation circuits include with the sequentially connected DDS synthesizers of FPGA control circuit,
Voltage-current converter circuit, both-end turn single-end transformer, and the both-end turns the signal output end and VCO frequencies of single-end transformer
The signal input part of rate combiner circuit connects.
Further, above-mentioned FPGA control circuit respectively by control line connect the frequency multiplier, the frequency divider and
The DDS synthesizers.
Further, the signal input part of above-mentioned FPGA control circuit is separately connected 31 control ports.
A kind of broadband high-precision frequency combining method, using a kind of above-mentioned broadband high-precision frequency synthesizer,
It is characterized in that：Include the following steps：
Step 1：VCO frequency combiner circuit is debugged, the output signal of the voltage controlled oscillator and the phase frequency detector are made
Signal input part input signal frequency it is consistent；
Step 2：The externally input 31 control level of FPGA control circuit identification, changes according to the control level of input
The frequency of output signal, and control DDS frequency generation circuits and export corresponding current signal；
Step 3：The current signal is converted into voltage signal by voltage-current converter circuit, then passes through transformation
Double-end signal is converted to single-ended signal and by being exported to VCO frequency combiner circuit after band-pass filter by device；
Step 4：The voltage signal is converted into d. c. voltage signal by phase frequency detector and by the first low pass filtered
To voltage controlled oscillator, the output that voltage controlled oscillator exports corresponding frequencies according to the d. c. voltage signal is believed for output after the filtering of wave device
Number, then exported to the frequency of the second low-pass filter signal by frequency multiplier and frequency divider control；
Step 5：Second low-pass filter exports obtained signal by being exported to signal after programmable amplifier gain
End.
Further, in above-mentioned steps four, FPGA control circuit is by controlling the Clock Multiplier Factor and frequency divider of frequency multiplier
Frequency division coefficient, the frequency of control output to the second low-pass filter signal, calculation formula are：
Frequency divider output frequency=frequency multiplier input frequency * Clock Multiplier Factors/frequency division coefficient.
By adopting the above-described technical solution, the beneficial effects of the invention are as follows：
The broadband high-precision frequency synthesizer and synthetic method of the present invention, which solves broadband signal, needs frequency-division section selection defeated
Go out, the problem that multimode switches, output power is insufficient, signal harmonic is larger；
Broadband output can be achieved in the present invention, and reference frequency output reaches 10.9M~1.175GHz；
Program-controlled output can be achieved in the present invention, and precision is consistent with DDS synthesizers；
The amplitude output signal of broadband high-precision frequency synthesizer is controllable in the present invention, and Phn100 is better than -99dBc/Hz,
Phn20M is better than -147dBc/Hz, and harmonic wave is small, and pickup electrode is clean；
The system response of broadband high-precision frequency synthesizer is better than 1us in the present invention.
Description of the drawings
Fig. 1 is the frequency synthesizer circuit connection diagram of the present invention.
Fig. 2 is the DDS frequency generation circuit connection diagrams of the present invention.
Fig. 3 is the VCO frequency combiner circuit connection diagram of the present invention.
Fig. 4 is the frequency combining method flow diagram of the present invention.
Specific implementation mode
With reference to attached drawing 1-4, specific description is done to embodiments of the present invention.
A kind of broadband high-precision frequency synthesizer, including FPGA control circuit, the signal of the FPGA control circuit are defeated
Enter end connection external signal, the signal output end of the FPGA control circuit connects DDS frequencies by level translator and generates electricity
Road, the signal input part of the signal output end connection VCO frequency combiner circuit of the DDS frequency generation circuits, the VCO frequency
The signal output end of combiner circuit also passes through control line by programmable amplifier connection signal output end, the FPGA control circuit
It is separately connected the DDS frequency generation circuits and the VCO frequency combiner circuit.
Further, above-mentioned VCO frequency combiner circuit includes and the sequentially connected frequency discrimination of DDS frequency generation circuits
The signal output end of phase discriminator, voltage controlled oscillator, frequency multiplier and frequency divider, the frequency multiplier is also connected with the phase frequency detector,
The signal output end of the frequency divider connects the programmable amplifier.
Further, above-mentioned DDS frequency generation circuits are connected with VCO frequency synthesis electricity by bandpass filter, described
It is connected, the phase frequency detector and voltage-controlled is shaken by the first low-pass filter between VCO frequency combiner circuit and programmable amplifier
It swings and is connected by the second low-pass filter between device, pass through third low-pass filtering between the programmable amplifier and signal output end
Device connect, the bandpass filter be 30-50MHz bandpass filters, first low-pass filter, the second low-pass filter and
Third low-pass filter is 1.2GHz low-pass filters.
Further, above-mentioned DDS frequency generation circuits include with the sequentially connected DDS synthesizers of FPGA control circuit,
Voltage-current converter circuit, both-end turn single-end transformer, and the both-end turns the signal output end and VCO frequencies of single-end transformer
The signal input part of rate combiner circuit connects.
Further, above-mentioned FPGA control circuit respectively by control line connect the frequency multiplier, the frequency divider and
The DDS synthesizers.
Further, the signal input part of above-mentioned FPGA control circuit is separately connected 31 control ports.
A kind of broadband high-precision frequency combining method, using a kind of above-mentioned broadband high-precision frequency synthesizer,
It is characterized in that：Include the following steps：
Step 1：VCO frequency combiner circuit is debugged, the output signal of the voltage controlled oscillator and the phase frequency detector are made
Signal input part input signal frequency it is consistent；
Step 2：The externally input 31 control level of FPGA control circuit identification, changes according to the control level of input
The frequency of output signal, and control DDS frequency generation circuits and export corresponding current signal；
Step 3：The current signal is converted into voltage signal by voltage-current converter circuit, then passes through transformation
Double-end signal is converted to single-ended signal and by being exported to VCO frequency combiner circuit after band-pass filter by device；
Step 4：The voltage signal is converted into d. c. voltage signal by phase frequency detector and by the first low pass filtered
To voltage controlled oscillator, the output that voltage controlled oscillator exports corresponding frequencies according to the d. c. voltage signal is believed for output after the filtering of wave device
Number, then exported to the frequency of the second low-pass filter signal by frequency multiplier and frequency divider control；
Step 5：Second low-pass filter exports obtained signal by being exported to signal after programmable amplifier gain
End.
Further, in above-mentioned steps four, FPGA control circuit is by controlling the Clock Multiplier Factor and frequency divider of frequency multiplier
Frequency division coefficient, the frequency of control output to the second low-pass filter signal, calculation formula are：
Frequency divider output frequency=frequency multiplier input frequency * Clock Multiplier Factors/frequency division coefficient.
Broadband high-precision frequency synthesizer energy output frequency of the present invention is the signal source of 10.9M~1.175GHz, is had
31 control ports change the frequency of output signal, and signal source design is realized using DDS and VCO voltage controlled oscillators, output
Power can reach 200mW or so, which has the characteristics that output accuracy is high, consumption power is small, easy for installation.
FPGA processor is made of the hardware such as FPGA and peripheral minimum system, is mainly used for DDS chips, VCO chips
The identification of timing control and control port.
Since the control level of FPGA is 3.3V, and the control level of AD9851 is 5V, it is therefore desirable to be turned to level
It could be matched after changing, SN74LV4245A is that a two-way level translator can be achieved with 3.3V by being dragged down to the ports CE
Level conversion is 5V level.
DDS frequency generation circuits are to provide a reference frequency, controlled and microprocessor for voltage controlled oscillator.DDS chips
It is ADC to select the AD9851 of ADI companies, the chip with high performance 10, and 32 be frequency control word, makes a digital programmable
Frequency synthesizer and clock generator functionalization.When with reference to accurate clock source, AD9851 can generate a stable frequency
With phase and the analog sine output of programming can be digitized, this sine wave can be directly used as the clock source of CDCE421A.
VCO frequency combiner circuit passes through phase frequency detector, charge pump, low-pass filter, pressure to the reference frequency that DDS is provided
It controls oscillator and output frequency divider exports later, controlled and microprocessor.The selection of voltage-controlled oscillator (VCO) chip is TI companies
CDCE421A, the chip have the work(such as phase frequency detector, charge pump, low-pass filter, voltage controlled oscillator and output frequency divider
Energy block, the clock source that AD9851 is generated is directly as the reference clock of CDCE421A.
FPGA control circuit first passes through some external port of judgement and enables, and then control AD9851 and CDCE421A is defeated at once
Go out the signal of the corresponding frequency in its port.
Claims (8)
1. a kind of broadband high-precision frequency synthesizer, it is characterised in that：Including FPGA control circuit, the FPGA control circuit
Signal input part connect external signal, the signal output end of the FPGA control circuit passes through level translator and connects DDS frequencies
Rate generative circuit, the signal input part of the signal output end connection VCO frequency combiner circuit of the DDS frequency generation circuits, institute
The signal output end of VCO frequency combiner circuit is stated by programmable amplifier connection signal output end, the FPGA control circuit is also
It is separately connected the DDS frequency generation circuits and the VCO frequency combiner circuit by control line.
2. a kind of broadband high-precision frequency synthesizer according to claim 1, it is characterised in that：The VCO frequency
Combiner circuit includes and the sequentially connected phase frequency detector of the DDS frequency generation circuits, voltage controlled oscillator, frequency multiplier and frequency dividing
Device, the signal output end of the frequency multiplier are also connected with the phase frequency detector, described in the signal output end connection of the frequency divider
Programmable amplifier.
3. a kind of broadband high-precision frequency synthesizer according to claim 1 or 2, it is characterised in that：The DDS frequencies
Rate generative circuit and VCO frequency synthesis electricity are connected by bandpass filter, the VCO frequency combiner circuit and programmable amplifier it
Between by the first low-pass filter connect, between the phase frequency detector and voltage controlled oscillator pass through the second low-pass filter connect
It connects, is connected by third low-pass filter between the programmable amplifier and signal output end, the bandpass filter is 30-
50MHz bandpass filters, first low-pass filter, the second low-pass filter and third low-pass filter are 1.2GHz low passes
Filter.
4. a kind of broadband high-precision frequency synthesizer according to claim 1, it is characterised in that：The DDS frequencies
Generative circuit includes turning single-ended transformation with the sequentially connected DDS synthesizers of FPGA control circuit, voltage-current converter circuit, both-end
Device, the signal output end that the both-end turns single-end transformer are connect with the signal input part of the VCO frequency combiner circuit.
5. a kind of broadband high-precision frequency synthesizer according to claim 1,2 or 4, it is characterised in that：Described
FPGA control circuit connects the frequency multiplier, the frequency divider and the DDS synthesizers by control line respectively.
6. a kind of broadband high-precision frequency synthesizer according to claim 2, it is characterised in that：The FPGA controls
The signal input part of circuit is separately connected 31 control ports.
7. a kind of broadband high-precision frequency combining method, using a kind of broadband high-precision frequency conjunction described in claim 1
It grows up to be a useful person, it is characterised in that：Include the following steps：
Step 1：VCO frequency combiner circuit is debugged, the letter of the output signal and the phase frequency detector of the voltage controlled oscillator is made
The signal frequency of number input terminal input is consistent；
Step 2：The externally input 31 control level of FPGA control circuit identification, changes according to the control level of input and exports
The frequency of signal, and control DDS frequency generation circuits and export corresponding current signal；
Step 3：The current signal is converted into voltage signal by voltage-current converter circuit, it then will by transformer
Double-end signal is converted to single-ended signal and by being exported to VCO frequency combiner circuit after band-pass filter；
Step 4：The voltage signal is converted into d. c. voltage signal by phase frequency detector and by the first low-pass filter
Output to voltage controlled oscillator, voltage controlled oscillator exports the output signal of corresponding frequencies according to the d. c. voltage signal after filtering,
Then it is exported to the frequency of the second low-pass filter signal by frequency multiplier and frequency divider control；
Step 5：Second low-pass filter is by obtained signal by being exported to signal output end after programmable amplifier gain.
8. a kind of broadband high-precision frequency combining method according to claim 7, it is characterised in that：The step 4
In, FPGA control circuit passes through the frequency division coefficient of the Clock Multiplier Factor and frequency divider of control frequency multiplier, control output to the second low pass
The frequency of filter signal, calculation formula are：
Frequency divider output frequency=frequency multiplier input frequency * Clock Multiplier Factors/frequency division coefficient.
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|---|---|---|---|---|
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-
2018
- 2018-05-08 CN CN201810432499.1A patent/CN108768392A/en active Pending
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