CN104579326A - Radio frequency signal source capable of reducing output signal stray - Google Patents
Radio frequency signal source capable of reducing output signal stray Download PDFInfo
- Publication number
- CN104579326A CN104579326A CN201310479875.XA CN201310479875A CN104579326A CN 104579326 A CN104579326 A CN 104579326A CN 201310479875 A CN201310479875 A CN 201310479875A CN 104579326 A CN104579326 A CN 104579326A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- switch
- control signal
- dds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention provides a radio frequency signal source capable of reducing output signal stray. The radio frequency signal source comprises a DDS (direct digital synthesizer) signal source unit, a phase-locked frequency conversion unit, a through path, a control unit, a first switch and a second switch, wherein the control unit is used for generating a fourth control signal; the phase-locked frequency conversion unit comprises a fourth switch arranged between a voltage-controlled oscillator and a power supply; the fourth switch is switched on according to the fourth control signal when the first switch selects to input a DDS signal into the phase-locked frequency conversion unit so as to enable the power supply to supply power to the voltage-controlled oscillator and is switched off according to the fourth control signal when the first switch selects to input the DDS signal into the through path so as to enable the power supply not to supply power to the voltage-controlled oscillator. According to the radio frequency signal source, the power supply is enabled not to supply power to the voltage-controlled oscillator, the amplitude of the DDS signal output from the phase-locked frequency conversion unit to an output port is decreased, stray signals caused by the phase-locked frequency conversion unit are reduced, non-harmonic stray of output signals is reduced, and the spectrum purity of the output signals is increased.
Description
Technical field
The present invention relates to thermometrically technical field, particularly relate to a kind of reduction and output signal spuious radio-frequency signal source.
Background technology
Radio-frequency signal source is a kind of emission of radio frequency signals device, and it can export a frequency and all stable signal of amplitude, and can be used for calibrating spectrum analyzer, simulation produces the various signals etc. that user needs.
The patent No. is that the United States Patent (USP) " Signal generator with directly-extractableDDS signal source " of US8044725 discloses a kind of radio-frequency signal source.As shown in Figure 1, radio-frequency signal source 100 comprises: direct digital synthesis technique (DDS or DDFS, Direct Digital Frequency Synthesis) information source unit 101, for carrying out the process such as direct digital synthesis technique according to clock signal, produce DDS signal; Phase-locked converter unit 102, for carrying out phase-locked process and frequency-conversion processing according to DDS signal, produces the first frequency band signals; Through path 32, for exporting DDS signal as the second frequency band signals; First switch 104, inputs to phase-locked converter unit or through path for selecting by DDS signal; Second switch 105, exports the first frequency band signals or the second frequency band signals for selecting.Wherein, DDS information source unit 101 comprises DDS module 21, DAC module 22 and anti-aliasing filter module 23; Phase-locked converter unit 102 comprises phase-locked loop (PLL, Phase Locked Loop) module and frequency translation module, PLL module comprises: phase discriminator 24, loop filter 25, tunable oscillator 26 and Fractional-N frequency device 27, and frequency translation module comprises: frequency multiplier 29, straight-through module 30, frequency divider 31 etc.; The phase-locked converter unit 102 of second switch 105 gating or through path 32, its signal selected, after amplifier 33, exports at signal output part 34.
By the direct digital synthesis technique process of DDS module 21, the digital-to-analogue conversion process of DAC module 22 and the filtering process of anti-aliasing filter module 23, can produce the DDS signal of certain frequency scope (covering 8kHz ~ 30MHz).When the signal output part 34 of radio-frequency signal source 100 needs the frequency signal exporting 8kHz ~ 30MHz, first switch 104 selects DDS signal to be exported by through path 32, produce the second frequency band signals of 8kHz ~ 30MHz frequency range, by the selection of switch 105, export at signal output part 34 after amplifier 33.When the signal output part 34 of radio-frequency signal source 100 needs the frequency signal of output 30 ~ 3000MHz, first switch 104 selects DDS signal to input to phase-locked converter unit 102, as the reference signal of phase discriminator 24, carry out phase-locked process in pll modules, produce the phase-locked output signal of 750 ~ 1500MHz frequency, then the difference of output frequency is needed according to radio-frequency signal source 100, frequency divider 31 is selected in frequency translation module, straight-through module 30 or frequency multiplier 29 carry out frequency extension transform to phase-locked output signal, produce the first frequency band signals, its frequency range can cover 30 ~ 3000MHz, by the selection of second switch 105, export the signal of corresponding frequencies at signal output part 34 after amplifier 33.By phase-locked converter unit 102 and through path 32, make radio-frequency signal source 100 finally can produce the output signal of 8kHz ~ 3000MHz.
The radio-frequency signal source 100 of prior art, there is a problem: when exporting the output signal of 8kHz ~ 30MHz frequency range, by switch 104 by DDS signal switching to through path 32, the phase discriminator 24 of phase-locked converter unit 102 does not have reference signal to input, by phase discriminator 24, loop filter 25, the PLL module that tunable oscillator 26 and Fractional-N frequency device 27 are formed is in out-of-lock condition, even if select DDS signal not to be inputed to phase-locked converter unit 102 by the switching of switch 104, because the isolation of phase-locked converter unit 102 is bad, by Space Coupling and channel transfer, part DDS signal also can be exported at output 34 by phase-locked converter unit 102, make output 34 except exporting first frequency band signals of 8kHz ~ 30MHz, also there is the spurious signal that a phase-locked converter unit 102 brings.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of reduction and outputs signal spuious radio-frequency signal source, when making to be outputed signal by through path, reduce the spurious signal that phase-locked converter unit brings, the anharmonic wave reducing output signal is spuious, improves the spectral purity of output signal.
In order to solve the problem, the invention discloses a kind of reduction and outputing signal spuious radio-frequency signal source, comprising:
DDS information source unit, for producing DDS signal according to clock signal;
Phase-locked converter unit, the power supply comprising voltage controlled oscillator and power to voltage controlled oscillator, for producing the first frequency band signals according to described DDS signal;
Through path, for producing the second frequency band signals according to described DDS signal;
Control unit, for generation of the first control signal and the second control signal;
First switch, for selecting described DDS signal to input to described phase-locked converter unit or described through path according to described first control signal;
Second switch, for selecting described first frequency band signals or the described second frequency band signals output signal as described radio-frequency signal source according to described second control signal;
Described control unit is also for generation of the 4th control signal;
Described phase-locked converter unit also comprises: be arranged on the 4th switch between voltage controlled oscillator and power supply;
Described 4th switch is used for, when described first switch selects DDS signal to input to phase-locked converter unit, closing, power supply is conducted to the confession of voltage controlled oscillator according to the 4th control signal; When described first switch selects DDS signal to input to through path, disconnect according to the 4th control signal, power supply is disconnected to the power supply of voltage controlled oscillator.
Illustrate as one, described control unit produces described first control signal, described second control signal and described 4th control signal simultaneously, and the selection simultaneously controlling described first switch, described second switch and described 4th switch respectively switches.
Illustrate as one, described control unit comprises:
First arranges subelement, for receiving the output frequency that user is arranged;
First controls subelement, for according to described output frequency, produces described first control signal, described second control signal and described 4th control signal simultaneously, and the selection controlling described first switch, described second switch and described 4th switch respectively switches.
Illustrate as one, described control unit comprises:
Second arranges subelement, counts for the swept frequency range and frequency sweep receiving user's setting;
Second controls subelement, for counting according to described swept frequency range and described frequency sweep, obtains the frequency of each frequency sweep point; And frequency corresponding according to each frequency sweep point successively, produce the first control signal, the second control signal and the 4th control signal, the selection controlling the first switch, second switch and the 4th switch respectively switches simultaneously.
Illustrate as one, first controls subelement comprises:
First data processing module, for sending corresponding configuration information to three of switch control module registers respectively according to described output frequency, and after described three registers complete configuration, sends triggering signal to described three registers simultaneously;
There is the switch control module of three registers, for being configured described three registers respectively according to described configuration information, and after receiving described triggering signal, make described three registers send first control signal corresponding with respective configuration information, the second control signal and the 4th control signal simultaneously.
Illustrate as one, second controls subelement comprises:
Second data processing module, for counting according to described swept frequency range and described frequency sweep, obtain the frequency of each frequency sweep point, and send corresponding configuration information according to frequency corresponding to each frequency sweep point respectively to three registers of switch control module successively, and after described three registers complete configuration, send triggering signal respectively to described three registers;
There is the switch control module of three registers, for being configured described three registers respectively according to described configuration information, and after receiving described triggering signal, make described three registers send first control signal corresponding with respective configuration information, the second control signal and the 4th control signal simultaneously.
Illustrate as one, described 4th switch comprises: NPN triode and PNP triode;
The base stage of NPN triode is by the first resistance access the 4th control signal, the grounded emitter of NPN triode, the collector electrode of NPN triode connects the base stage of PNP triode by the second resistance, the emitter of PNP triode connects described power supply, and the collector electrode of PNP triode connects the voltage controling end of voltage controlled oscillator.
Illustrate as one, described phase-locked converter unit comprises:
Frequency mixer, for by DDS signal and the mixing of clock signal phase, produces the DDS signal after mixing;
Buffer, for carrying out shaping to the DDS signal after mixing, produces the DDS signal after shaping;
Phase-locked loop module, for carrying out phase-locked process to the DDS signal after shaping, produces phase-locked output signal;
Frequency translation module, for carrying out frequency translation to phase-locked output signal, produces the first frequency band signals.
Illustrate as one, described control unit is also for generation of the 3rd control signal; Described through path comprises: the 3rd switch between earth resistance, the signal input part being arranged on through path and signal output part thereof; Described 3rd switch is used for, when described first switch selects DDS signal to input to phase-locked converter unit, according to the 3rd control signal, the signal input part of through path being electrically connected to the ungrounded end of earth resistance; When described first switch selects DDS signal to input to through path, according to the 3rd control signal by the circuit turn-on between the signal input part of through path and the signal output part of through path.
Illustrate as one, described control unit produces described first control signal, described second control signal, described 3rd control signal and described 4th control signal simultaneously, and the selection simultaneously controlling described first switch, described second switch, described 3rd switch and described 4th switch respectively switches.
Compared with prior art, the present invention has the following advantages:
1, when radio-frequency signal source exports the second frequency band signals, the 4th switch arranged between voltage controlled oscillator and power supply disconnects, power supply is disconnected to the power supply of voltage controlled oscillator, voltage controlled oscillator does not have signal to export, DDS signal exports output port to amplitude by phase-locked converter unit can be reduced, wherein, the output signal of main reduction voltage controlled oscillator exports the amplitude of output port to by frequency translation module, therefore, reduce the spurious signal that this path of phase-locked converter unit brings, the anharmonic wave reducing output signal is spuious, improve the spectral purity of output signal.
2, control unit produces the first control signal, the second control signal and the 4th control signal simultaneously, the selection simultaneously controlling the first switch, second switch and the 4th switch respectively switches, reach the object of above-mentioned three switch synchronization actions, the transmission channel of signal is synchronously set up at one time, avoid because each switching time is different, the output signal brought is unstable, produces the impacts such as the error in amplitude and frequency.
3, by increasing frequency mixer and buffer at phase-locked converter unit, then be input to the frequency of the mixing in phase discriminator the DDS signal after shaping, increase than the frequency of DDS signal, the frequency dividing ratio of variable frequency divider can reduce accordingly, due to frequency dividing ratio diminish time, phase noise can reduce, when frequency dividing ratio becomes large, phase noise can increase, therefore, phase noise also reduces accordingly, improves the performance index of instrument.
4, when radio-frequency signal source exports the first frequency band signals, the signal input part of through path is electrically connected to the ungrounded end of earth resistance according to the 3rd control signal by the 3rd switch, make DDS signal or input to ground through the DDS signal of amplification, filtering process by earth resistance, DDS signal exports output port to amplitude by through path can be reduced, reduce the spurious signal that through path brings, the anharmonic wave reducing output signal is spuious, improves the spectral purity of output signal.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of radio-frequency signal source 100 disclosed in prior art;
Fig. 2 is a kind of structural representation reducing to output signal spuious radio-frequency signal source 200 embodiment one of the present invention;
Fig. 3 is the structural representation of the another kind of switching over state of radio-frequency signal source 200 shown in Fig. 2;
Fig. 4 is the illustrational structural representation of one of control unit 204;
Fig. 5 is a kind of structural representation reducing to output signal spuious radio-frequency signal source 500 embodiment two of the present invention;
Fig. 6 is the structural representation of the another kind of switching over state of radio-frequency signal source 500 shown in Fig. 5;
Fig. 7 is the illustrational structural representation of one of the 3rd switch 208;
Fig. 8 is the illustrational structural representation of one of the 4th switch 211.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
With reference to Fig. 2, show a kind of structural representation reducing to output signal spuious radio-frequency signal source 200 embodiment one of the present invention, radio-frequency signal source 200 comprises:
DDS information source unit 201, for carrying out direct digital synthesis technique process according to clock signal clock, produces DDS signal;
Phase-locked converter unit 202, the power supply PowerSupply comprise voltage controlled oscillator 3013, powering to voltage controlled oscillator and the 4th switch 211 be arranged between voltage controlled oscillator 3013 and power supply Power Supply, described phase-locked converter unit 202, for carrying out phase-locked process and frequency-conversion processing according to described DDS signal, produces the first frequency band signals s1;
Through path 203, for producing the second frequency band signals s2 according to DDS signal;
Control unit 204, for generation of the first control signal c1, the second control signal c2 and the 4th control signal c4;
First switch 205, for selecting DDS signal to input to phase-locked converter unit 202 or through path 203 according to the first control signal c1;
Second switch 206, for selecting the output signal of the first frequency band signals s1 or the second frequency band signals s2 as radio-frequency signal source 200 according to the second control signal c2;
Output port 207, for exporting the output signal of radio-frequency signal source 200;
Described 4th switch 211, for when described first switch 205 selects DDS signal to input to phase-locked converter unit 202, closes according to the 4th control signal c4, power supply Power Supply is conducted to the confession of voltage controlled oscillator 3013; When described first switch 205 selects DDS signal to input to through path 203, disconnect according to the 4th control signal c4, power supply Power Supply is disconnected to the power supply of voltage controlled oscillator 3013.
Below, each component units of radio frequency signal source 200 illustrates respectively:
Illustrate as one, as shown in Figure 2, DDS information source unit 201 can comprise: DDS module 2011, DAC module 2012 and anti-aliasing filter module 2013.DDS module 2011 is for carrying out direct digital synthesis technique, the reference frequency signal that generated frequency is variable according to clock signal clock; DAC module 2012, for carrying out the conversion of digital to analogy to reference frequency signal, produces the reference frequency signal of simulation; Anti-aliasing filter module 2013 pairs of analog references frequency signals carry out filtering process, can produce the DDS signal of certain frequency scope
Illustrate as one, as shown in Figure 2, phase-locked converter unit 202 can comprise PLL module 301 and frequency translation module 302.PLL module 301 pairs of DDS signals carry out phase-locked process, produce phase-locked output signal, PLL module 301 can comprise: phase discriminator 3011, loop filter 3012, voltage controlled oscillator 3013, variable frequency divider 3014 and the power supply Power Supply powered to voltage controlled oscillator.Control unit 204 comprises a frequency dividing ratio control module, for controlling the frequency dividing ratio of variable frequency divider 3014; Variable frequency divider 3014 carries out frequency division for the phase-locked output signal produced by voltage controlled oscillator 3013 according to described frequency dividing ratio, is input to phase discriminator 3011; Phase discriminator 3011, for the output signal of DDS signal and variable frequency divider 3014 being compared, obtains the error voltage signal relevant to phase difference; Loop filter 3012 pairs of error voltages carry out filtering process, such as, radio-frequency component in filtering error voltage signal and noise, produce voltage control signal, and this voltage control signal controls the output of voltage controlled oscillator 3013.Frequency translation module 302 can comprise many branch roads such as frequency multiplication, straight-through, frequency division, carries out frequency change process, final generation the first frequency band signals s1 by the phase-locked output signal produced voltage controlled oscillator 3013.
Illustrate as another, as shown in Figure 2, phase-locked converter unit 202 can also comprise: be arranged on the frequency mixer 303 before PLL module 301 and frequency translation module 302 and buffer 304.Frequency mixer 303, for by DDS signal and the mixing of clock signal clock phase, produces the DDS signal after mixing; Buffer 304, for carrying out shaping to the DDS signal after mixing, produces mixing and DDS signal after shaping; Then PLL module 301 pairs of mixing DDS signal after shaping carries out phase-locked process, produce phase-locked output signal.Originally illustrate owing to adding frequency mixer 303 and buffer 304, then be input to the frequency of the mixing in phase discriminator 3011 the DDS signal after shaping, increase than the frequency of DDS signal, the frequency dividing ratio of variable frequency divider 3014 can reduce accordingly, due to frequency dividing ratio diminish time, phase noise can reduce, when frequency dividing ratio becomes large, phase noise can increase, therefore, phase noise also reduces accordingly, improves the performance index of instrument.
In embodiments of the present invention, as shown in Figure 2, when radio-frequency signal source 200 needs output first frequency band signals s1, DDS information source unit 201 produces DDS signal according to clock signal clock, first switch 205 is selected DDS signal to input to phase-locked this road of converter unit 202 according to the first control signal c1, 4th switch 211 closes according to the 4th control signal c4, power supply Power Supply is conducted to the confession of voltage controlled oscillator 3031, the loop of PLL module 301 is in conducting state, thus make phase-locked converter unit 202 can produce the first frequency band signals s1 according to DDS signal, simultaneously, second switch 206 is phase-locked this road of converter unit 202 of gating also, first frequency band signals s1 is inputed to output port 207 according to the second control signal c2 by it.
As shown in Figure 3, when radio-frequency signal source 200 needs output second frequency band signals s2, DDS signal is inputed to this road of through path 203 according to the first control signal c1 by the first switch 205, through path 203 produces the second frequency band signals s2 according to DDS signal, second frequency band signals s2 is inputed to output port 207 according to the second control signal c2 by second switch 206, simultaneously, 4th switch 211 disconnects according to the 4th control signal c4, power supply Power Supply is disconnected to the power supply of voltage controlled oscillator 3031, voltage controlled oscillator 3031 does not have signal to export, the loop of PLL module 301 is in off-state, reduce DDS signal exports output port 207 to amplitude by phase-locked converter unit 202, reduce the spurious signal that phase-locked this path of converter unit 202 brings, the anharmonic wave reducing output signal is spuious, improve the spectral purity of output signal.
Illustrate as one, the frequency of clock signal clock is 100MHz, the frequency range of DDS signal is 9kHz ~ 23.4375MHz, the frequency range of the first frequency band signals s1 is that 23.4375MHz ~ 6GHz(comprises 23.4375MHz), the frequency range of the second frequency band signals s2 is 9kHz ~ 23.4375MHz.Illustrate as another, the frequency of clock signal clock is the frequency range of 100MHz, DDS signal is 8kHz ~ 30MHz, and the frequency range of the first frequency band signals s1 is 30MHz ~ 3000MHz, and the frequency range of the second frequency band signals s2 is 8kHz ~ 30MHz.
Illustrate as one, can also arrange amplifier between second switch 206 and output port 207, then the first frequency band signals s1 or the second frequency band signals s2 of second switch 206 selection carry out, after signal amplification, being exported by output port 207 through amplifier.
Illustrate as one, control unit 204 produces the first control signal c1, the second control signal c2 and the 4th control signal c4 simultaneously, and the selection simultaneously controlling the first switch 205, second switch 206 and the 4th switch 211 respectively switches.By controlling above-mentioned three switches simultaneously, reach the object of above-mentioned three switch synchronization actions, the transmission channel of signal is synchronously set up at one time, avoid because each switching time is different, the output signal brought is unstable, produces the impacts such as the error in amplitude and frequency.
As shown in Figure 4, illustrate as one, when radio-frequency signal source 200 according to user arrange export the output signal of single-frequency time, control unit 204 comprises:
First arranges subelement 401, for receiving the output frequency a that user is arranged;
First controls subelement 402, for the output frequency a arranged according to user, produces the first control signal c1, the second control signal c2 and the 4th control signal c4 simultaneously, and the selection controlling the first switch 205, second switch 206 and the 4th switch 211 respectively switches.
Controlling subelement 402 inside first can pre-configured output frequency a and the first control signal c1, the corresponding relation of the concrete signal value of the second control signal c2 and the 4th control signal c4, when the output frequency a that user is arranged is within the frequency range of the first frequency band signals s1, then the first control signal c1 controls the first switch 205 and selects DDS signal to input to phase-locked converter unit 202, 4th control signal c4 controls the 4th switch 211 and closes, second control signal c2 controls the phase-locked converter unit 202 of second switch 206 gating, using the output signal of the first frequency band signals s1 as radio-frequency signal source, the selection switching state of each switch above-mentioned as shown in Figure 2.When the output frequency that user is arranged is within the frequency range of the second frequency band signals s2, first control signal c1, the second control signal c2 and the 4th control signal c4, control the selection switching state of the first switch 205, second switch 206 and the 4th switch 211 as shown in Figure 3 respectively.
In originally illustrating, as an example, as shown in Figure 4, the first control subelement 402 comprises: the first data processing module 4021 and switch control module 4022, switch control module 4022 has three registers Buffer_1, Buffer_2 and Buffer_4.
First data processing module 4021 sends corresponding configuration information b for the output frequency a arranged according to user respectively to three registers Buffer_1, Buffer_2 and Buffer_4 of switch control module 4022, and after described three registers Buffer_1, Buffer_2 and Buffer_4 complete configuration, send triggering signal trigger to described three registers Buffer_1, Buffer_2 and Buffer_4 simultaneously;
Switch control module 4022 is for being configured three registers Buffer_1, Buffer_2 and Buffer_4 respectively according to described configuration information b, and after receiving triggering signal trigger, make described three registers Buffer_1, Buffer_2 and Buffer_4 send the first control signal c1 corresponding with respective configuration information b, the second control signal c2 and the 4th control signal c4 simultaneously.
As an example, the first data processing module 4021 can be made up of DSP, and switch control module 4022 can be made up of FPGA.Such as, user arranges output frequency by button, when user after setting completed, DSP can receive an interrupt signal, then FPGA will configure and three registers in order, such as press (1) in Fig. 4, (2), (3) configuration information b configures to the Buffer_1 of FPGA by order respectively successively, Buffer_2 and Buffer_4, work as Buffer_1, after Buffer_2 and Buffer_4 has configured, transmission triggering signal trigger is notified that FPGA register has configured by DSP, three register Buffer_1, after Buffer_2 and Buffer_4 receives triggering signal trigger, produce the first control signal c1 simultaneously, second control signal c2 and the 4th control signal c4, to reach the object of three switch synchronization actions.
Described configuration information b can be " 0 ", " 1 " mark, such as, when the output frequency that user is arranged is within the frequency range of the first frequency band signals s1, the configuration information that first data processing module 4021 sends to three registers Buffer_1, Buffer_2 and Buffer_4 is " 0 ", makes the first control signal c1, the second control signal c2 and the 4th control signal c4 control the switching state of each switch as shown in Figure 2.When the output frequency that user is arranged is within the frequency range of the second frequency band signals s2, the configuration information that first data processing module 4021 sends to three registers Buffer_1, Buffer_2 and Buffer_4 is " 1 ", makes the first control signal c1, the second control signal c2 and the 4th control signal c4 control the switching state of each switch as shown in Figure 3.Be understandable that, first data processing module 4021 also can be different to the configuration information that three registers Buffer_1, Buffer_2 and Buffer_4 send, but the configuration information of different identification finally makes the first switch 205, second switch 206 and the 4th switch 211 reach the switching state shown in Fig. 2 or Fig. 3 simultaneously.
Illustrate as another, when radio-frequency signal source 200 carries out frequency sweep according to the setting of user according to the setting of user, when exporting the output signal of a certain frequency range, control unit 204 comprises:
Second arranges subelement, counts for the swept frequency range and frequency sweep receiving user's setting;
Second controls subelement, for counting according to described swept frequency range and described frequency sweep, obtains the frequency of each frequency sweep point; And frequency corresponding according to each frequency sweep point successively, produce the first control signal c1, the second control signal c2 and the 4th control signal c4, the selection controlling the first switch 205, second switch 206 and the 4th switch 211 respectively switches simultaneously.
In originally illustrating, as an example, second controls subelement comprises:
Second data processing module, for counting according to described swept frequency range and described frequency sweep, obtain the frequency of each frequency sweep point, and send corresponding configuration information according to frequency corresponding to each frequency sweep point respectively to three registers of switch control module successively, and after described three registers complete configuration, send triggering signal to described three registers simultaneously;
There is the switch control module of three registers, for being configured described three registers respectively according to described configuration information, and after receiving described triggering signal, make described three registers send the first control signal c1 corresponding with respective configuration information, the second control signal c2 and the 4th control signal c4 simultaneously.
Such as, the frequency range of the first frequency band signals s1 is that 23.4375MHz ~ 6GHz(comprises 23.4375MHz), the frequency range of the second frequency band signals s2 is 9kHz ~ 23.4375MHz.When radio-frequency signal source 200 carries out frequency sweep, the Frequency point of two passage bridge is 23.4375MHz, and when the frequency of frequency sweep point is within the scope of 9kHz ~ 23.4375MHz, the enable possition of each switch as shown in Figure 3; When the frequency of frequency sweep point is within the scope of 23.4375MHz ~ 6GHz, the enable possition of each switch as shown in Figure 2.No matter frequency is uprised by low, or by high step-down, switch control module can control each switch and switch simultaneously, to avoid switching the output signal mistake brought simultaneously.
The specific implementation that frequency sweep exports can see the last way of output illustrating the single-frequency of description, and relevant part can cross-reference, repeats no more herein.Difference is, the output of single-frequency only needs once to configure three registers, and sweep method needs to obtain frequency corresponding to each frequency sweep point, every frequency sweep point all once will configure three registers, and each frequency sweep point will trigger generation first control signal c1, the second control signal c2 and the 4th control signal c4.
Be understandable that, two for above-mentioned single-frequency output and frequency sweep output illustrate, first arranges subelement 401 and second arranges subelement and can be integrated in a setting unit, first control subelement 402 and the second control subelement can be integrated in one and control in subelement, first data processing module 4021 and the second data processing module can be integrated in a data processing module, as in DSP.
As shown in Figure 5, the structural representation outputing signal spuious radio-frequency signal source 500 embodiment two is reduced for the present invention is a kind of, radio-frequency signal source 500 comprises: DDS information source unit 201, phase-locked converter unit 202, through path 203, control unit 204, first switch 205, second switch 206 and output port 207, and phase-locked converter unit 202 comprises voltage controlled oscillator 3013, the power supply PowerSupply that powers to voltage controlled oscillator and the 4th switch 211 be arranged between voltage controlled oscillator 3013 and power supply Power Supply.Each component units of radio-frequency signal source 500 see above-described embodiment one, can repeat no more herein.
With embodiment one unlike, in embodiment two, described control unit 204 is also for generation of the 3rd control signal c3, and described through path 203 comprises: the 3rd switch 208 between earth resistance R, the signal input part 209 being arranged on through path 203 and signal output part 210 thereof.The signal input part 209 of through path 203, for when the first switch 205 selects DDS signal to input to phase-locked converter unit 202, is electrically connected to the ungrounded end of earth resistance R by described 3rd switch 208 according to the 3rd control signal c3; When the first switch 205 selects DDS signal to input to through path 203, according to the 3rd control signal c3 by the circuit turn-on between the signal input part 209 of through path 203 and the signal output part 210 of through path 203.
Illustrate as one, except the 3rd switch 208, any device can not be had between the signal input part 209 of through path 203 and signal output part 210, directly be communicated with by wire, when then the 3rd switch 208 is by circuit turn-on between the signal input part 209 of through path 203 and signal output part 210, DDS signal directly exports as the second frequency band signals s2 by through path 203.
Illustrate as another, as shown in Figure 5, except the 3rd switch 208, through path 203 can also comprise: be connected on the amplification module 2031 between the signal input part 209 of through path and signal output part 210 thereof and filtration module 2032.Amplification module 2031, for amplifying DDS signal, produces the DDS signal after amplifying; Filtration module 2032, for carrying out filtering to the DDS signal after amplification, produces the second frequency band signals s2.3rd switch 208 is arranged on the series circuit between the signal input part 209 of through path and signal output part 220 thereof.
In above-mentioned illustrating, as an example, as shown in Figure 5,3rd switch 208 is arranged between the signal input part 209 of through path and amplification module 2031, then the input of the 3rd switch 208 connects the signal input part 209 of through path, an output of the 3rd switch 208 connects the input of amplification module 2031, and another output of the 3rd switch 208 connects the ungrounded end of earth resistance R.As another example, 3rd switch 208 can be arranged between amplification module 2031 and filtration module 2032, then the input of the 3rd switch 208 connects the output of amplification module 2031, an output of the 3rd switch 208 connects the input of filtration module 2032, and another output of the 3rd switch 208 connects the ungrounded end of earth resistance R.When radio-frequency signal source 200 needs output first frequency band signals s1, the signal input part 209 of through path 203 is electrically connected to the ungrounded end of earth resistance R by the 3rd switch 208 by amplification module 2031.As another example, the 3rd switch 208 can also be arranged between the signal output part 210 of filtration module 2032 and through path.When radio-frequency signal source 200 needs output first frequency band signals s1, the signal input part 209 of through path 203 is electrically connected to the ungrounded end of earth resistance R by the 3rd switch 208 successively by amplification module 2031 and filtration module 2032.Be understandable that, in above-mentioned three examples, the position of the 3rd switch 208, more close to the first switch 205, more can make DDS signal access to ground as early as possible, reduces the spurious signal that through path 203 brings greatly.
In embodiments of the present invention, as shown in Figure 5, when radio-frequency signal source 200 needs output first frequency band signals s1, the first switch 205 according to the first control signal c1 by DDS signal gating to phase-locked this road of converter unit 202; 4th switch 211 closes according to the 4th control signal c4, and power supply PowerSupply is conducted to the confession of voltage controlled oscillator 3031, thus phase-locked converter unit 202 produces the first frequency band signals s1 according to DDS signal; Second switch 206 is phase-locked this road of converter unit 202 of gating also, and the first frequency band signals s1 is inputed to output port 207 according to the second control signal c2 by it; Simultaneously, the signal input part 209 of through path 203 is electrically connected to the ungrounded end of earth resistance R by the 3rd switch 208 according to the 3rd control signal c3, make DDS signal or input to ground through the DDS signal of amplification, filtering process by earth resistance R, to reduce DDS signal to export output port 207 to amplitude by through path 203, reduce the spurious signal that through path brings, the anharmonic wave reducing output signal is spuious, improves the spectral purity of output signal.
As shown in Figure 6, when radio-frequency signal source 200 needs output second frequency band signals s2, the first switch 205 according to the first control signal c1 by DDS signal gating to this road of through path 203; 4th switch 211 disconnects according to the 4th control signal c4, and power supply Power Supply is disconnected to the power supply of voltage controlled oscillator 2031; 3rd switch 208 according to the 3rd control signal c3 by the circuit turn-on between the signal input part 209 of through path 203 and its signal output part 210, through path 203 is made to produce the second frequency band signals s2 according to DDS signal, DDS signal no longer inputs to ground through earth resistance R, second switch 206 is this road of gating through path 203 also, and the second frequency band signals s2 is inputed to output port 207 according to the second control signal c2 by it.
Illustrate as one, described control unit 204 produces described first control signal c1, described second control signal c2, described 3rd control signal c3 and described 4th control signal c4 simultaneously, and the selection simultaneously controlling the first switch 205, second switch 206, the 3rd switch 208 and the 4th switch 211 respectively switches.
The inside component units of control unit 204 and concrete function realize can refer to Fig. 4 and related description thereof.Accordingly, aforesaid first controls subelement 402, second control subelement according to the output frequency a of user's setting or frequency corresponding according to each frequency sweep point successively, can produce the first control signal c1, the second control signal c2, the 3rd control signal c3 and the 4th control signal c4 simultaneously.Aforesaid switch control module 4022 has four registers, it is configured four registers respectively according to described configuration information b, and after receiving triggering signal trigger, make described four registers send the first control signal c1 corresponding with respective configuration information b, the second control signal c2, the 3rd control signal c3 and the 4th control signal c4 simultaneously.
In above-described embodiment one and embodiment two, illustrate as one, the first switch 205, second switch 206 and the 3rd switch 208 are radio frequency integrated circuit, according to the enable possition that switch needs, its pin add the level value of corresponding control signal.
For the 3rd switch 208, its pin definitions as shown in Figure 7.Pin A(pin1) and B(pin2) as the control end of the 3rd switch 208, receive the 3rd control signal c3; Pin RFC(pin3) as the input of the 3rd switch 208, the signal input part 209 of electrical connection through path 203; Pin RF1(pin5) and RF2(pin8) be respectively two outputs of the 3rd switch 208, select one of them to connect the ungrounded end of earth resistance R, the signal output part 210 of another electrical connection through path 203.
When pin A is input as 0, when pin B is input as+5V, the signal inputted from pin RFC will export from pin RF1, and what pin RF2 exported is the signal that the signal inputted from pin RFC passes through certain decay, and attenuation depends on the isolation of radio frequency integrated circuit device.
When pin A is input as+5V, when pin B is input as 0, the signal inputted from pin RFC will export from pin RF2, and what pin RF1 exported is the signal that the signal inputted from pin RFC passes through certain decay, and attenuation depends on the isolation of radio frequency integrated circuit device equally.
In above-described embodiment one and embodiment two, illustrate as one, as shown in Figure 8, the 4th switch 211 comprises: NPN triode 801 and PNP triode 802; The base stage of NPN triode 801 accesses the 4th control signal c4 by the first resistance 803, the grounded emitter of NPN triode 801, the collector electrode of NPN triode 801 connects the base stage of PNP triode 802 by the second resistance 804, the emitter of PNP triode 802 connects described power supply Power Supply, and the collector electrode of PNP triode 802 connects the feeder ear of voltage controlled oscillator 3013.The supply power voltage of described power supply Power Supply is generally 10V.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Above spuious radio-frequency signal source is outputed signal to a kind of reduction provided by the present invention, be described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. reduce to output signal a spuious radio-frequency signal source, comprising:
DDS information source unit, for producing DDS signal according to clock signal;
Phase-locked converter unit, the power supply comprising voltage controlled oscillator and power to voltage controlled oscillator, for producing the first frequency band signals according to described DDS signal;
Through path, for producing the second frequency band signals according to described DDS signal;
Control unit, for generation of the first control signal and the second control signal;
First switch, for selecting described DDS signal to input to described phase-locked converter unit or described through path according to described first control signal;
Second switch, for selecting described first frequency band signals or the described second frequency band signals output signal as described radio-frequency signal source according to described second control signal;
It is characterized in that,
Described control unit is also for generation of the 4th control signal;
Described phase-locked converter unit also comprises: be arranged on the 4th switch between voltage controlled oscillator and power supply;
Described 4th switch is used for, when described first switch selects DDS signal to input to phase-locked converter unit, closing, power supply is conducted to the confession of voltage controlled oscillator according to the 4th control signal; When described first switch selects DDS signal to input to through path, disconnect according to the 4th control signal, power supply is disconnected to the power supply of voltage controlled oscillator.
2. radio-frequency signal source as claimed in claim 1, is characterized in that,
Described control unit produces described first control signal, described second control signal and described 4th control signal simultaneously, and the selection simultaneously controlling described first switch, described second switch and described 4th switch respectively switches.
3. radio-frequency signal source as claimed in claim 2, it is characterized in that, described control unit comprises:
First arranges subelement, for receiving the output frequency that user is arranged;
First controls subelement, for according to described output frequency, produces described first control signal, described second control signal and described 4th control signal simultaneously, and the selection controlling described first switch, described second switch and described 4th switch respectively switches.
4. radio-frequency signal source as claimed in claim 2, it is characterized in that, described control unit comprises:
Second arranges subelement, counts for the swept frequency range and frequency sweep receiving user's setting;
Second controls subelement, for counting according to described swept frequency range and described frequency sweep, obtains the frequency of each frequency sweep point; And frequency corresponding according to each frequency sweep point successively, produce the first control signal, the second control signal and the 4th control signal, the selection controlling the first switch, second switch and the 4th switch respectively switches simultaneously.
5. radio-frequency signal source as claimed in claim 3, is characterized in that, first controls subelement comprises:
First data processing module, for sending corresponding configuration information to three of switch control module registers respectively according to described output frequency, and after described three registers complete configuration, sends triggering signal to described three registers simultaneously;
There is the switch control module of three registers, for being configured described three registers respectively according to described configuration information, and after receiving described triggering signal, make described three registers send first control signal corresponding with respective configuration information, the second control signal and the 4th control signal simultaneously.
6. radio-frequency signal source as claimed in claim 4, is characterized in that, second controls subelement comprises:
Second data processing module, for counting according to described swept frequency range and described frequency sweep, obtain the frequency of each frequency sweep point, and send corresponding configuration information according to frequency corresponding to each frequency sweep point respectively to three registers of switch control module successively, and after described three registers complete configuration, send triggering signal respectively to described three registers;
There is the switch control module of three registers, for being configured described three registers respectively according to described configuration information, and after receiving described triggering signal, make described three registers send first control signal corresponding with respective configuration information, the second control signal and the 4th control signal simultaneously.
7. the radio-frequency signal source as described in any one of claim 1 to 6, is characterized in that,
Described 4th switch comprises: NPN triode and PNP triode;
The base stage of NPN triode accesses the 4th control signal by the first resistance, the grounded emitter of NPN triode, and the collector electrode of NPN triode connects the base stage of PNP triode by the second resistance,
The emitter of PNP triode connects described power supply, and the collector electrode of PNP triode connects the voltage controling end of voltage controlled oscillator.
8. the radio-frequency signal source as described in any one of claim 1 to 6, is characterized in that, described phase-locked converter unit comprises:
Frequency mixer, for by DDS signal and the mixing of clock signal phase, produces the DDS signal after mixing;
Buffer, for carrying out shaping to the DDS signal after mixing, produces the DDS signal after shaping;
Phase-locked loop module, for carrying out phase-locked process to the DDS signal after shaping, produces phase-locked output signal;
Frequency translation module, for carrying out frequency translation to phase-locked output signal, produces the first frequency band signals.
9. the radio-frequency signal source as described in any one of claim 1 to 6, is characterized in that,
Described control unit is also for generation of the 3rd control signal; Described through path comprises: the 3rd switch between earth resistance, the signal input part being arranged on through path and signal output part thereof;
Described 3rd switch is used for, when described first switch selects DDS signal to input to phase-locked converter unit, according to the 3rd control signal, the signal input part of through path being electrically connected to the ungrounded end of earth resistance; When described first switch selects DDS signal to input to through path, according to the 3rd control signal by the circuit turn-on between the signal input part of through path and the signal output part of through path.
10. radio-frequency signal source as claimed in claim 9, is characterized in that,
Described control unit produces described first control signal, described second control signal, described 3rd control signal and described 4th control signal simultaneously, and the selection simultaneously controlling described first switch, described second switch, described 3rd switch and described 4th switch respectively switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310479875.XA CN104579326A (en) | 2013-10-14 | 2013-10-14 | Radio frequency signal source capable of reducing output signal stray |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310479875.XA CN104579326A (en) | 2013-10-14 | 2013-10-14 | Radio frequency signal source capable of reducing output signal stray |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104579326A true CN104579326A (en) | 2015-04-29 |
Family
ID=53094669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310479875.XA Pending CN104579326A (en) | 2013-10-14 | 2013-10-14 | Radio frequency signal source capable of reducing output signal stray |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104579326A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
| CN107276588A (en) * | 2017-08-07 | 2017-10-20 | 成都菲斯洛克电子技术有限公司 | A kind of low harmony wave phase locked source circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6957078B1 (en) * | 2000-06-21 | 2005-10-18 | Northrop Grumman Corporation | Gated power for a satellite hopped downlink with multiple payloads per frame |
| US20090066436A1 (en) * | 2007-09-12 | 2009-03-12 | Richwave Technology Corp. | Multi-brand electronic apparatus and multi-band signal processing method |
| US20100073051A1 (en) * | 2008-09-22 | 2010-03-25 | Prism Circuits, Inc | Low jitter large frequency tuning lc pll for multi-speed clocking applications |
| US8044725B2 (en) * | 2005-10-17 | 2011-10-25 | Rohde & Schwarz Gmbh & Co. Kg | Signal generator with directly-extractable DDS signal source |
| US20120223778A1 (en) * | 2011-03-03 | 2012-09-06 | Jongshin Shin | Digitally controlled oscillator, and phase locked loop (pll) circuit including the same |
-
2013
- 2013-10-14 CN CN201310479875.XA patent/CN104579326A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6957078B1 (en) * | 2000-06-21 | 2005-10-18 | Northrop Grumman Corporation | Gated power for a satellite hopped downlink with multiple payloads per frame |
| US8044725B2 (en) * | 2005-10-17 | 2011-10-25 | Rohde & Schwarz Gmbh & Co. Kg | Signal generator with directly-extractable DDS signal source |
| US20090066436A1 (en) * | 2007-09-12 | 2009-03-12 | Richwave Technology Corp. | Multi-brand electronic apparatus and multi-band signal processing method |
| US20100073051A1 (en) * | 2008-09-22 | 2010-03-25 | Prism Circuits, Inc | Low jitter large frequency tuning lc pll for multi-speed clocking applications |
| US20120223778A1 (en) * | 2011-03-03 | 2012-09-06 | Jongshin Shin | Digitally controlled oscillator, and phase locked loop (pll) circuit including the same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
| CN105071804B (en) * | 2015-07-23 | 2018-04-10 | 中国电子科技集团公司第四十一研究所 | A kind of Low phase noise broadband microwave local oscillator source circuit and its implementation method |
| CN107276588A (en) * | 2017-08-07 | 2017-10-20 | 成都菲斯洛克电子技术有限公司 | A kind of low harmony wave phase locked source circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101726712B (en) | Radio frequency signal generating device | |
| CN102497237B (en) | Radio frequency and microwave synthetic instrument based on PXIe (PCI Extensions for Instrumentation) synthetic instrument architecture | |
| CN102386946B (en) | Data transmission rapid frequency hopping radio station | |
| CN104135301A (en) | Radio frequency receiver and receiving method | |
| CN105262486B (en) | A kind of X-band frequency synthesizer | |
| CN103647529A (en) | Multimode signal generating device and signal generating method thereof | |
| CN105510888A (en) | Radar signal simulation method based on digital synthesis, and simulator | |
| CN113381755B (en) | Clock system with synchronization function and synchronization realization method thereof | |
| CN108037332B (en) | Multi-channel reference clock generation module | |
| CN115037387B (en) | Multichannel microwave signal source device, system and signal processing method | |
| CN105094014B (en) | High-speed parallel D/A clock synchronization apparatus | |
| CN102946249A (en) | Frequency synthesizer | |
| CN101459465B (en) | Local oscillation device supporting multiple frequency band working mode | |
| CN104579326A (en) | Radio frequency signal source capable of reducing output signal stray | |
| CN110187311A (en) | Radar parameter configuration method, frequency source and radar system | |
| CN105429628A (en) | Frequency spreading device with calibration function, RF signal source and control method thereof | |
| CN103326718B (en) | A kind of rf chain of rubidium frequency standard | |
| CN115694475B (en) | Full-coherent reference signal generation circuit, combination circuit and control method | |
| CN104569589A (en) | Device and method for automatically testing Ku waveband phase difference of multi-branch power amplifier | |
| CN104579331A (en) | Low-spurious radio frequency signal source | |
| CN203608181U (en) | Frequency synthesizer | |
| CN102355259A (en) | Integrated circuits with frequency generating circuits | |
| CN105471471A (en) | Radio-frequency signal system, radio frequency signal source and frequency expansion device control method | |
| CN111240401B (en) | Multi-channel clock generating device | |
| CN209201057U (en) | Broadband frequency agility signal source module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150429 |
|
| RJ01 | Rejection of invention patent application after publication |