CN103840824A - Frequency synthesis signal device capable of improving frequency resolution, and synthesis method of frequency synthesis signal device - Google Patents
Frequency synthesis signal device capable of improving frequency resolution, and synthesis method of frequency synthesis signal device Download PDFInfo
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- CN103840824A CN103840824A CN201410086616.5A CN201410086616A CN103840824A CN 103840824 A CN103840824 A CN 103840824A CN 201410086616 A CN201410086616 A CN 201410086616A CN 103840824 A CN103840824 A CN 103840824A
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Abstract
The invention relates to a frequency synthesis signal device capable of improving the frequency resolution. The frequency synthesis signal device comprises a loop filter, a voltage-controlled oscillator, a frequency synthesis chip and a decimal modulation signal generator. Based on the specific connection structure, the frequency synthesis signal device capable of improving the frequency resolution is formed, the structure is simple, and manufacturing cost is effectively controlled. Accordingly, the invention further designs a synthesis method of the frequency synthesis signal device capable of improving the frequency resolution. According to the method, the steps are clear and simple, based on the prior art, decimal frequency division secondary modulation is conducted by leading in decimal frequency division modulation signals, and therefore the resolution of output synthesized signal frequence is greatly improved, and the high requirement for applications is met.
Description
Technical field
The present invention relates to a kind of frequency synthesized signal device and synthetic method that improves frequency resolution.
Background technology
Fractional frequency synthetic technology is the common technology that contemporary electronic systems (particularly electronic instrument product) improves the frequency resolution of the high frequency resolution radiofrequency signal producing.
In existing general commercial fractional frequency synthesis chip, the decimal digits of frequency divider generally only has 24, like this in the time of 50MHz phase demodulation frequency, the frequency resolution of high frequency resolution radiofrequency signal can reach 3Hz, corresponding in the time of 100MHz phase demodulation frequency, the frequency resolution of high frequency resolution radiofrequency signal can reach 6Hz.But for the higher occasion of high frequency resolution radio frequency signal frequency resolution requirement, as the high frequency resolution radiofrequency signal of 0.01Hz frequency resolution, even when the high frequency resolution radiofrequency signal of 0.001Hz frequency resolution, existing commercial fractional frequency synthesis chip just cannot have been realized.
Summary of the invention
For above-mentioned technical problem, technical problem to be solved by this invention is to provide a kind of frequency synthesized signal device of the raising frequency resolution that can effectively meet high frequency resolution radio frequency signal frequency resolution high request.
Corresponding therewith, for above-mentioned technical problem, technical problem to be solved by this invention is to provide a kind of frequency synthesized signal device that improves frequency resolution that designs based on the present invention, meets the synthetic method of high frequency resolution radio frequency signal frequency resolution high request.
The present invention is in order to solve the problems of the technologies described above by the following technical solutions: the present invention has designed a kind of frequency synthesized signal device that improves frequency resolution, comprises frequency synthesis chip, voltage controlled oscillator, loop filter, decimal modulation signal generator; Wherein, decimal modulation signal generator is connected with frequency modulation/phase modulation function trigger end of frequency synthesis chip, the phase demodulation electric current output of frequency synthesis chip is connected to loop filter, loop filter is sent the error signal of integration into the voltage-controlled end to voltage controlled oscillator, the radio frequency output signal of voltage controlled oscillator is returned to the rf inputs of sending into frequency synthesis chip again, carries out phase demodulation genlocing with the reference frequency signal of sending into frequency synthesis chip.
As a preferred technical solution of the present invention: described decimal modulation signal generator is controller or logical device.
As a preferred technical solution of the present invention: described frequency synthesis chip is general commercial frequency synthesis chip.
As a preferred technical solution of the present invention: described voltage controlled oscillator is voltage-controlled oscillator.
A kind of frequency synthesized signal device that improves frequency resolution of the present invention adopts above technical scheme compared with prior art, there is following technique effect: the frequency synthesized signal device of the raising frequency resolution of the present invention's design, simple in structure, control manufacturing cost, on prior art basis, carry out fractional frequency division secondary modulation by introducing fractional frequency division modulation signal, make the high frequency resolution radio frequency signal frequency resolution obtaining can meet the high request of practical application.
Corresponding therewith, the present invention is in order to solve the problems of the technologies described above by the following technical solutions: the present invention has designed a kind of synthetic method that designs the frequency synthesized signal device that improves frequency resolution based on the present invention, according to phase locked loop theory, reference frequency signal produces radiofrequency signal through described frequency synthesis chip, and is delivered to successively loop filter and voltage controlled oscillator; Voltage controlled oscillator returns to radiofrequency signal to frequency synthesis chip by feedback signal output, frequency synthesis chip completes signal after frequency division and the frequency division of the radiofrequency signal to returning and the phase demodulation of reference frequency signal, the error current that produces phase demodulation is sent into described loop filter, obtain integral error by loop filter, and send to described voltage controlled oscillator; Also comprise following process simultaneously:
Produce fractional frequency division modulation signal by described decimal modulation signal generator, be sent to frequency modulation/phase modulation function trigger end of frequency synthesis chip, the radiofrequency signal that frequency synthesis chip returns voltage controlled oscillator feedback signal output by fractional frequency division modulation signal is carried out the decimal modulation of frequency modulation/phase modulation, produce the composite signal of high frequency resolution, through loop filter and voltage controlled oscillator output.
As a preferred technical solution of the present invention: described loop filter is used for suppressing the high-end shaping noise producing in decimal modulated process.
The synthetic method of a kind of frequency synthesized signal device based on improving frequency resolution of the present invention adopts above technical scheme compared with prior art, there is following technique effect: the present invention design design the synthetic method of the frequency synthesized signal device that improves frequency resolution based on the present invention, step is clear simple and clear, on prior art basis, carry out fractional frequency division secondary modulation by introducing fractional frequency division modulation signal, make the high frequency resolution radio frequency signal frequency resolution obtaining can meet the high request of practical application.
Accompanying drawing explanation
Fig. 1 is the module map of the frequency synthesized signal device of the raising frequency resolution that designs of the present invention.
Embodiment
Below in conjunction with Figure of description, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, the present invention designs a kind of frequency synthesized signal device that improves frequency resolution, comprises frequency synthesis chip, voltage controlled oscillator, loop filter, decimal modulation signal generator; Wherein, decimal modulation signal generator is connected with frequency modulation/phase modulation function trigger end of frequency synthesis chip, the phase demodulation electric current output of frequency synthesis chip is connected to loop filter, loop filter is sent the error signal of integration into the voltage-controlled end to voltage controlled oscillator, the radio frequency output signal of voltage controlled oscillator is returned to the rf inputs of sending into frequency synthesis chip again, carries out phase demodulation genlocing with the reference frequency signal of sending into frequency synthesis chip.
For above technical scheme, wherein, described decimal modulation signal generator is controller or logical device; Described frequency synthesis chip is general commercial frequency synthesis chip, and this chip has frequency modulation or phase modulation function; Described voltage controlled oscillator is voltage-controlled oscillator; Described frequency synthesis chip is HMC703LP4E.
The frequency synthesized signal device of the raising frequency resolution designing with technique scheme is corresponding, the present invention has designed the synthetic method of the frequency synthesized signal device based on this raising frequency resolution, according to phase locked loop theory, reference frequency signal produces radiofrequency signal through described frequency synthesis chip, and is delivered to successively loop filter and voltage controlled oscillator; Voltage controlled oscillator returns to radiofrequency signal to frequency synthesis chip by feedback signal output, frequency synthesis chip completes signal after frequency division and the frequency division of the radiofrequency signal to returning and the phase demodulation of reference frequency signal, the error current that produces phase demodulation is sent into described loop filter, obtain integral error by loop filter, and send to described voltage controlled oscillator; Also comprise following process simultaneously:
Produce fractional frequency division modulation signal by described decimal modulation signal generator, be sent to frequency modulation/phase modulation function trigger end of frequency synthesis chip, the radiofrequency signal that frequency synthesis chip returns voltage controlled oscillator feedback signal output by fractional frequency division modulation signal is carried out the decimal modulation of frequency modulation/phase modulation, produce the composite signal of high frequency resolution, through loop filter and voltage controlled oscillator output.Wherein, loop filter is used for suppressing the high-end shaping noise producing in decimal modulated process, thereby guarantees the good characteristic of making an uproar mutually of composite signal of output.
Based on a kind of frequency synthesized signal device that improves frequency resolution of the present invention's design, simple in structure, control manufacturing cost, and the present invention has designed the synthetic method of the frequency synthesized signal device based on this raising frequency resolution, step is clear simple and clear, on prior art basis, carry out fractional frequency division secondary modulation by introducing fractional frequency division modulation signal, make the high frequency resolution radio frequency signal frequency resolution obtaining can meet the high request of practical application, all if make the high frequency resolution radio frequency signal frequency resolution generating reach 0.001Hz.
In sum, frequency synthesized signal device and the synthetic method of the raising frequency resolution of the present invention's design, based on prior art, utilize frequency modulation, the phase modulation function of frequency synthesis chip, carry out fractional frequency division secondary modulation by introducing fractional frequency division modulation signal simultaneously, can effectively meet the high request that improves high frequency resolution radio frequency signal frequency resolution, there is huge actual application value.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned execution mode, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, makes a variety of changes.
Claims (6)
1. a frequency synthesized signal device that improves frequency resolution, is characterized in that: comprise frequency synthesis chip, voltage controlled oscillator, loop filter, decimal modulation signal generator; Wherein, decimal modulation signal generator is connected with frequency modulation/phase modulation function trigger end of frequency synthesis chip, the phase demodulation electric current output of frequency synthesis chip is connected to loop filter, loop filter is sent the error signal of integration into the voltage-controlled end to voltage controlled oscillator, the radio frequency output signal of voltage controlled oscillator is returned to the rf inputs of sending into frequency synthesis chip again, carries out phase demodulation genlocing with the reference frequency signal of sending into frequency synthesis chip.
2. a kind of frequency synthesized signal device that improves frequency resolution according to claim 1, is characterized in that: described decimal modulation signal generator is controller or logical device.
3. a kind of frequency synthesized signal device that improves frequency resolution according to claim 1, is characterized in that: described frequency synthesis chip is general commercial frequency synthesis chip.
4. a kind of frequency synthesized signal device that improves frequency resolution according to claim 1, is characterized in that: described voltage controlled oscillator is voltage-controlled oscillator.
5. the synthetic method of frequency synthesized signal device based on improving frequency resolution described in any one in claim 1 to 4, according to phase locked loop theory, reference frequency signal produces radiofrequency signal through described frequency synthesis chip, and is delivered to successively loop filter and voltage controlled oscillator; Voltage controlled oscillator returns to radiofrequency signal to frequency synthesis chip by feedback signal output, frequency synthesis chip completes signal after frequency division and the frequency division of the radiofrequency signal to returning and the phase demodulation of reference frequency signal, the error current that produces phase demodulation is sent into described loop filter, obtain integral error by loop filter, and send to described voltage controlled oscillator; It is characterized in that, also comprise following process simultaneously:
Produce fractional frequency division modulation signal by described decimal modulation signal generator, be sent to frequency modulation/phase modulation function trigger end of frequency synthesis chip, the radiofrequency signal that frequency synthesis chip returns voltage controlled oscillator feedback signal output by fractional frequency division modulation signal is carried out the decimal modulation of frequency modulation/phase modulation, produce the composite signal of high frequency resolution, through loop filter and voltage controlled oscillator output.
6. a kind of synthetic method of frequency synthesized signal device based on improving frequency resolution described in any one in claim 1 to 4 according to claim 5, is characterized in that: described loop filter is used for suppressing the high-end shaping noise producing in decimal modulated process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410086616.5A CN103840824A (en) | 2014-03-10 | 2014-03-10 | Frequency synthesis signal device capable of improving frequency resolution, and synthesis method of frequency synthesis signal device |
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| CN201410086616.5A CN103840824A (en) | 2014-03-10 | 2014-03-10 | Frequency synthesis signal device capable of improving frequency resolution, and synthesis method of frequency synthesis signal device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030198311A1 (en) * | 2002-04-19 | 2003-10-23 | Wireless Interface Technologies, Inc. | Fractional-N frequency synthesizer and method |
| CN1988389A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Low phase noise frequency synthesizer |
| US7388939B2 (en) * | 2001-10-31 | 2008-06-17 | Sirf Technology, Inc. | Fractional-R frequency synthesizer |
| US20090278611A1 (en) * | 2008-05-06 | 2009-11-12 | Cloutier Mark M | Integrated ramp, sweep fractional frequency synthesizer on an integrated circuit chip |
| CN103023491A (en) * | 2012-12-12 | 2013-04-03 | 哈尔滨飞羽科技有限公司 | Linear sweep frequency source used for FMCW (Frequency Modulated Continuous Wave) radars |
-
2014
- 2014-03-10 CN CN201410086616.5A patent/CN103840824A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7388939B2 (en) * | 2001-10-31 | 2008-06-17 | Sirf Technology, Inc. | Fractional-R frequency synthesizer |
| US20030198311A1 (en) * | 2002-04-19 | 2003-10-23 | Wireless Interface Technologies, Inc. | Fractional-N frequency synthesizer and method |
| CN1988389A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Low phase noise frequency synthesizer |
| US20090278611A1 (en) * | 2008-05-06 | 2009-11-12 | Cloutier Mark M | Integrated ramp, sweep fractional frequency synthesizer on an integrated circuit chip |
| CN103023491A (en) * | 2012-12-12 | 2013-04-03 | 哈尔滨飞羽科技有限公司 | Linear sweep frequency source used for FMCW (Frequency Modulated Continuous Wave) radars |
Non-Patent Citations (1)
| Title |
|---|
| PETER BARRON: "HMC703LP4E Evaluation PCB Schematic", 《HITTITE MICROWAVE CORPORATION》 * |
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