CN1553592A - Signal phase tracking network - Google Patents
Signal phase tracking network Download PDFInfo
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- CN1553592A CN1553592A CNA031408974A CN03140897A CN1553592A CN 1553592 A CN1553592 A CN 1553592A CN A031408974 A CNA031408974 A CN A031408974A CN 03140897 A CN03140897 A CN 03140897A CN 1553592 A CN1553592 A CN 1553592A
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Abstract
This invention discloses a signal phase tracking network used to track the signal phase of multi reference sources, comprising: the original vibration source providing original vibration signal to track the reference source signal; the clock driver driving original vibration source to output multi signals to track multi corresponding reference source signals; the multi phase adjusting circuits each connect to the signal output end of clock driver, the above phase adjusting circuits are used to track one route reference source signal due to one route signal outputted by original vibration source and adjust the signal phase of origin vibration source in this route according to the result of tracking and checking. The invention provides multi original source signal by the clock driver, so it can track multi reference source signal, because it only uses one original vibration source, so the reliability is improved relatively.
Description
Technical field
The present invention relates to the signal trace technology, relate to a kind of signal phase tracking network more specifically.
Background technology
Usually, the signal that transmits in the communication has frequency and two kinds of attributes of phase place, is the basis of modern communications based on the change process of signal frequency, phase place, and as one side wherein, the signal trace technology is also constantly advancing.The signal trace technology is meant by following the tracks of the variation (comprising frequency change or phase change etc.) of detection signal, to reach the purpose of further control signal transmission, it has important position in communication, all be widely used at industry-by-industry, particularly relate in the industry of communication, for example in space communication, satellite communication and the mobile communication, signal trace detects the key component that all is absolutely necessary.Existing signal trace technology has multiple, the frequency (or phase place) of detection signal change to launch but basic principle all is based on, change by the frequency (or phase place) of following the tracks of detection signal, can understand the state of communication, so that when breaking down, find reason rapidly, or make communication keep certain state by FEEDBACK CONTROL.PHASE-LOCKED LOOP PLL TECHNIQUE is exactly a kind of technology of tracking control signal phase place of extensive use, phase change by the track reference source signal, further reach control signal output, make the purpose of stable output signal, the principle that its realization is mainly controlled based on phase feedback, please form module map referring to phase-locked loop shown in Figure 1 (PLL), phase-locked loop (PLL) is mainly by phase discriminator 11 (Phase Detector, PD), loop filter 12 (Loop Filter, LF) and voltage controlled oscillator 13 (VoltageControlled Oscillator, VCO) three basic elements of character are formed, wherein phase discriminator 11 is used for reference source signal and local vibration source signal are carried out phase demodulation, and the output identified result is given low pass filter 12,12 of described low pass filters carry out filtering to phase discriminator 11 output signals, and be converted into voltage signal and export to voltage controlled oscillator 13,13 of described voltage controlled oscillators will be exported the result and feed back to phase discriminator 11, such circulation feedback is handled the frequency and the phase place that can make voltage controlled oscillator 13 and is all kept definite relation with the input reference source signal, and makes the phase noise of importing the noise that exists in the reference source signal and voltage controlled oscillator 13 self obtain certain inhibition.But need in the practical communication to follow the tracks of detection reference source signal may and more than one, address this problem, two kinds of implementations are arranged:
First kind of scheme, use the phase-locked loop closed loop circuit and the close reference source signal of a plurality of frequencies is followed the tracks of the shortcoming below this scheme exists:
1, phase-locked loop is a closed-loop system, a phase-locked loop circuit can only be followed the tracks of a reference source signal, want to realize following the tracks of a plurality of reference source signal and just need a plurality of phase-locked loop circuits, i.e. reference source signal of a local vibration source signal trace, obvious this implementation is also uneconomical, and local vibration source, quartz oscillator for example, poor reliability, use many more, the reliability of Circuits System is just poor more, and for example, local vibration source is quartz crystal voltage controlled oscillator (VCXO), the failure rate of industry is approximately 100FITS at present, suppose to use 10 VCXO, then failure rate is 1000FITS just, and this will influence the reliability of system greatly;
Therefore 2, phase-locked loop is a kind of FEEDBACK CONTROL closed-loop system, has unsettled possibility, and when on a certain frequency, the open-loop gain of loop is greater than 1, and phase shift is when spending near 180, and loop may produce vibration.
Second kind of scheme opened phase-locked loop, and promptly phase-locked loop is in open loop situations, by the phase-locked loop circuit of a plurality of open loops a plurality of reference source signal followed the tracks of, and this method has following shortcoming:
1, the phase noise of voltage controlled oscillator is very big to the phase-locked loop noise effect during open loop, and the closed loop phase-locked loop circuit has good filtration for the phase noise of voltage controlled oscillator, if make phase-locked loop be in open-loop tracking reference source signal phase place, phase-locked loop does not just have above-mentioned advantage, on the contrary because above-mentioned problem appears in the existence of voltage controlled oscillator;
2, the instructions for use to voltage controlled oscillator is higher in the phase-locked loop, good as frequency stability, control highly sensitively, the linearity of control characteristic will be got well, and the range of linearity is wide, noise is low as far as possible, contradiction often between these require, the consideration of will trading off during design is if be in open loop situations, obviously the use of voltage controlled oscillator will form above-mentioned problem, make design complicated more.
Summary of the invention
The invention provides a kind of signal phase tracking network, as the close reference source of a plurality of frequencies the time, can not utilize a local vibration source to follow the tracks of the problem of a plurality of reference sources to solve prior art.
In order to realize above-mentioned purpose of the present invention, a kind of signal phase tracking network provided by the invention is used to follow the tracks of a plurality of reference source signal phase places, and comprising provides benchmark local vibration source signal so that the local vibration source of track reference source signal, and this network also comprises:
Clock driver is used to drive local vibration source and exports a plurality of signals to follow the tracks of corresponding a plurality of reference source signal;
At least two phase-adjusting circuits, link to each other with the clock driver signal output part respectively, described phase-adjusting circuit is used for road local vibration source signal according to clock driver output, follows the tracks of one tunnel reference source signal and adjusts this road local vibration source signal phase that clock driver is exported according to following the tracks of testing result.
Concrete, described phase-adjusting circuit comprises:
Phase discriminator is used for one road local vibration source signal and one tunnel reference source signal are carried out phase demodulation, and output phase error voltage;
Filter is used for the phase error voltage from phase discriminator is carried out filtering and output;
Phase shifter is used for according to the voltage of filter output described local vibration source signal being carried out phase shift.
In addition, described phase-adjusting circuit also comprises:
Zero-crossing detector, be used to detect the phase error voltage of phase discriminator output, during to the null value saltus step, export a control signal that makes the local vibration source signal increase (or minimizing) waveform and increase and decrease device from maximum (or minimum value) at described phase error voltage to waveform;
Waveform increase and decrease device is used for making the local vibration source signal increase (or minimizing) waveform according to the control signal of zero-crossing detector output, and exports to phase shifter.
Compared with prior art, the present invention has following advantage:
1, drive local vibration source by clock driver a plurality of local vibration source signals are provided, can be used for following the tracks of a plurality of reference source signal, owing to only used a local vibration source to realize following the tracks of a plurality of reference source signal, reliability improves relatively;
2, do not use voltage controlled oscillator in the open loop phase tracking network among the present invention, solved and used the problems that voltage controlled oscillator causes under the phase-locked loop open loop situations, to the phase-locked loop The noise, voltage controlled oscillator requires the design complexity that causes to the difference of the linearity of frequency stability, control sensitivity and control characteristic etc. as the phase noise of voltage controlled oscillator;
3, phase-locked loop is a kind of feedback control system, therefore have unsettled possibility, when on a certain frequency, the open-loop gain of loop is greater than 1, and phase shift is when spending near 180, loop may produce vibration, and the present invention is better stable owing to being open loop, on the other hand, by adding zero-crossing detector and waveform increase and decrease device, the scope of track reference source signal phase place can expand to the scope of 360 degree, and does not have the problem of stability.
Description of drawings
Fig. 1 is the composition module map of prior art phase-locked loop;
Fig. 2 is the composition module map of first embodiment of the invention;
Fig. 3 is the composition module map of second embodiment of the invention;
Fig. 4 is the composition module map of third embodiment of the invention;
Fig. 5 is the composition module map of fourth embodiment of the invention;
Fig. 6 is the composition module map of the present invention to the output waveform shaping.
Embodiment
As shown in Figure 2, the first embodiment of the present invention, can be used for following the tracks of a plurality of reference source signal and control the signal phase tracking network that the local vibration source signal is exported according to following the tracks of the result who detects, comprise a local vibration source 10 that benchmark local vibration source signal is provided, also comprise clock driver 21 in addition, be used to drive a plurality of signals of local vibration source 10 outputs to follow the tracks of corresponding a plurality of reference source signal; At least two phase-adjusting circuits 22, link to each other with clock driver 21 signal output parts respectively, described phase-adjusting circuit 22 is used for road local vibration source signal according to clock driver 21 outputs, follows the tracks of one tunnel reference source signal and adjusts this road local vibration source signal phase that clock driver 21 is exported according to following the tracks of testing result.
As shown in Figure 3, the second embodiment of the present invention, can be used for following the tracks of a plurality of reference source signal and control the signal phase tracking network that the local vibration source signal is exported according to following the tracks of the result who detects, comprise a local vibration source 10 that benchmark local vibration source signal is provided, also comprise clock driver 21 in addition, be used to drive a plurality of signals of local vibration source 10 outputs to follow the tracks of corresponding a plurality of reference source signal; The phase-adjusting circuit groups that at least two phase discriminators 11, filter 12 and voltage-controlled phase shifter 30 are formed, phase discriminator 11 is used for one road local vibration source signal and one tunnel reference source signal are carried out phase demodulation in every group, and output phase error voltage; Filter 12 is used for the phase error voltage from phase discriminator 11 is carried out filtering and output; Voltage-controlled phase shifter 30 is used for according to the voltage of filter 12 outputs described local vibration source signal being carried out phase shift.
As shown in Figure 4, the third embodiment of the present invention, can be used for following the tracks of a plurality of reference source signal and control the signal phase tracking network that the local vibration source signal is exported according to following the tracks of the result who detects, comprise a local vibration source 10 that benchmark local vibration source signal is provided, also comprise clock driver 21 in addition, be used to drive a plurality of signals of local vibration source 10 outputs to follow the tracks of corresponding a plurality of reference source signal; The phase-adjusting circuit groups that at least two phase discriminators 11, filter 12, voltage-controlled phase shifter 30 and constant time lag device 40 are formed, phase discriminator 11 is used for one road local vibration source signal and one tunnel reference source signal are carried out phase demodulation in every group, and output phase error voltage; Filter 12 is used for the phase error voltage from phase discriminator 11 is carried out filtering and output; Constant time lag device 40 between clock driver 21 and voltage-controlled phase shifter 30, is used for the local vibration source signal compensation phase discriminator 11 of exporting to voltage-controlled phase shifter 30 and the time-delay that filter 12 causes; Voltage-controlled phase shifter 30 is used for according to the voltage of filter 11 outputs described local vibration source signal being carried out phase shift.
As shown in Figure 5, the fourth embodiment of the present invention, can be used for following the tracks of a plurality of reference source signal and control the signal phase tracking network that the local vibration source signal is exported according to following the tracks of the result who detects, comprise a local vibration source 20 that benchmark local vibration source signal is provided, also comprise clock driver 21 in addition, be used to drive a plurality of signals of local vibration source 10 outputs to follow the tracks of corresponding a plurality of reference source signal; The phase-adjusting circuit group that at least two phase discriminators 11, filter 12, voltage-controlled phase shifter 30, constant time lag device 40 and zero-crossing detectors 50 and waveshape detector 51 are formed, phase discriminator 11 is used for one road local vibration source signal and one tunnel reference source signal are carried out phase demodulation in every group, and output phase error voltage; Filter 12 is used for the phase error voltage from phase discriminator 11 is carried out filtering and output; Constant time lag device 40 between clock driver 21 and voltage-controlled phase shifter 30, is used for the local vibration source signal compensation phase discriminator 11 of exporting to voltage-controlled phase shifter 30 and the time-delay that filter 12 causes; Zero-crossing detector 50, be used to detect the phase error voltage of phase discriminator 11 outputs,, export one and make control signal that the local vibration source signal increases (or minimizing) waveform from maximum (or minimum value) during at described phase error voltage to waveform increase and decrease device 51 to the null value saltus step; Waveform increase and decrease device 51 between clock driver 21 and constant time lag device 40, is used for making the local vibration source signal increase (or minimizing) waveform according to the control signal of zero-crossing detector 50 outputs, and exports to voltage-controlled phase shifter 30; Voltage-controlled phase shifter 30 is used for according to the voltage of filter 11 outputs described local vibration source signal being carried out phase shift and output.
The following operation principle that signal phase tracking network of the present invention is described with reference to Fig. 2.
A local vibration source 10 drives exportable multichannel local vibration source signal so that follow the tracks of the multichannel reference source signal by clock driver 21, road local vibration source signal is wherein sent into and is followed the tracks of one tunnel reference source signal in the phase-adjusting circuit 22, adjust this road local vibration source signal phase and output according to following the tracks of the result who detects, just realize following the tracks of a plurality of reference source signal owing to only used a local vibration source 10, therefore, avoided using the problem of the poor reliability that a plurality of local vibration sources cause.
The following working method that the phase-adjusting circuit of being made up of phase discriminator 11, filter 12 and voltage-controlled phase shifter 30 22 is described with reference to Fig. 3.Because the working method of each phase-adjusting circuit 22 is identical, only describe below with the phase-adjusting circuit 22 of following the tracks of first via reference source signal.
Behind local vibration source signal of clock driver 21 outputs, one the tunnel sends into phase discriminator 11, voltage-controlled phase shifter 30 is given on another road, wherein send into one road local vibration source signal and the first via reference source signal phase demodulation of phase discriminator 11, phase discriminator 11 is according to phase error voltage of the corresponding output of result of phase demodulation, after filter 12 receives this error voltage, also need to carry out Filtering Processing, exporting to voltage-controlled phase shifter 30 after this error voltage smoothing processing, described voltage-controlled phase shifter 30 is voltage-controlled elements, adjusts local vibration source signal phase and final output according to the error control voltage that the smoothing processing of filter output is crossed.Unlike the prior art be that the signal phase tracking network has adopted open cycle system among the present invention, the frequency stability that forms owing to the existence of voltage controlled oscillator in the tracking circuit is bad, control sensitivity have relatively high expectations and the phase noise of voltage controlled oscillator to the influence of loop noise etc., adopted a voltage-controlled phase shifter 30 among the present invention, to avoid above-mentioned problem.
Under request in person referring to Fig. 4, in the actual signals transmission, signal can produce certain time-delay through phase discriminator 11 and filter 12 outputs, excessive if delay time, can make the signal generation error of adjusting output by voltage-controlled phase shifter 30, therefore, optimize, can in phase-adjusting circuit 22, add a constant time lag device 40, described constant time lag device 40 is mainly used in the time-delay that compensation phase discriminator 11 and filter 12 cause, during actual enforcement, can be added between clock driver 21 and the voltage-controlled phase shifter 30 as Fig. 4, also can add a compensation of delay device (not having shown in Figure 4) after phase discriminator 11 and filter 12, the working method behind the adding delayer roughly the same repeats no more here.
Under request in person referring to Fig. 5, further specify phase tracking circuit of the present invention, different with the foregoing description is to have added a zero-crossing detector 50 and a waveform increase and decrease device 51 in the present embodiment in phase-adjusting circuit 22, because the working method of other parts such as phase discriminator 11 and filter 12 and voltage-controlled phase shifter 30 is identical, below the working method of emphasis narration zero-crossing detector 50 and waveform increase and decrease device 51, during concrete track reference source signal, zero-crossing detector 50 detects the phase error voltage of phase discriminator 10 outputs, when the leading local vibration source phase place 360 of reference source phase place is spent, phase discriminator 11 output voltages can produce saltus step, promptly from maximum to the null value saltus step, at this moment zero-crossing detector 50 can detect the saltus step of this voltage, and export a control signal to waveform increase and decrease device 51, control waveform increase and decrease device increases a waveform for the local vibration source signal, and when reference source phase lag local vibration source phase place 360 is spent, phase discriminator 11 output voltages can be from minimum value to the null value saltus step, at this moment zero-crossing detector 50 can detect the saltus step of this voltage, control signal of same output is to waveform increase and decrease device 51, control waveform increase and decrease device 51 reduces by a waveform for the local vibration source signal, be not difficult to find out, the scope of phase tracking circuit track reference of the present invention source phase place has been brought up to 360 degree from 180 degree of original phase-locked loop, also be the variation that the present invention not only can follow the tracks of phase place, but the also variation of tracking frequency.
The effect of above-mentioned present embodiment median filter 12 mainly is the pulse voltage signal of smoothing processing phase discriminator 10 outputs, so actual only the need just can be realized with an integrator, in addition, as shown in Figure 6, can also comprise a reshaper 60 in the Phase Tracking network of the present invention, be used for the signal of phase-adjusting circuit 22 outputs is carried out shaping, be the situation of square wave at local vibration source signal or reference source signal for example, described reshaper 60 can be a square wave with the sine wave shaped of phase-adjusting circuit 22 outputs.
The above only is the preferred embodiments of the present invention, and is non-so promptly limit to interest field of the present invention, and the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all reason is with being contained in the claim scope of the present invention.
Claims (7)
1, a kind of signal phase tracking network is used to follow the tracks of a plurality of reference source signal phase places, comprises providing benchmark local vibration source signal so that the local vibration source of track reference source signal is characterized in that, this network also comprises:
Clock driver is used to drive local vibration source and exports a plurality of signals to follow the tracks of corresponding a plurality of reference source signal;
At least two phase-adjusting circuits, link to each other with the clock driver signal output part respectively, described phase-adjusting circuit is used for road local vibration source signal according to clock driver output, follows the tracks of one tunnel reference source signal and adjusts this road local vibration source signal phase that clock driver is exported according to following the tracks of testing result.
2, signal phase tracking network signal phase tracking network according to claim 1 is characterized in that described phase-adjusting circuit comprises:
Phase discriminator is used for one road local vibration source signal and one tunnel reference source signal are carried out phase demodulation, and output phase error voltage;
Filter is used for the phase error voltage from phase discriminator is carried out filtering and output;
Phase shifter is used for according to the voltage of filter output described local vibration source signal being carried out phase shift.
3, signal phase tracking network according to claim 2 is characterized in that, described phase-adjusting circuit also comprises a constant time lag device, between clock driver and phase shifter, is used to compensate the time-delay that phase discriminator and filter cause.
4, signal phase tracking network according to claim 2 is characterized in that, described phase-adjusting circuit also comprises the compensation of delay device, between filter and phase shifter, is used to compensate the time-delay that phase discriminator and filter cause.
5, signal phase tracking network according to claim 3 is characterized in that, described phase-adjusting circuit also comprises:
Zero-crossing detector, be used to detect the phase error voltage of phase discriminator output, during to the null value saltus step, export a control signal that makes the local vibration source signal increase (or minimizing) waveform and increase and decrease device from maximum (or minimum value) at described phase error voltage to waveform;
Waveform increase and decrease device between clock driver and constant time lag device, is used for making the local vibration source signal increase (or minimizing) waveform according to the control signal of zero-crossing detector output, and exports to phase shifter.
6, according to claim 2,3 or 4 described signal phase tracking networks, it is characterized in that described filter is an integrator.
7, signal phase tracking network according to claim 1 is characterized in that, described network also comprises reshaper, links to each other with the phase-adjusting circuit output, is used for the waveform of phase-adjusting circuit output is carried out shaping.
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| CNB031408974A CN1324815C (en) | 2003-06-06 | 2003-06-06 | Signal phase tracking network |
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| CNB031408974A CN1324815C (en) | 2003-06-06 | 2003-06-06 | Signal phase tracking network |
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| CN1553592A true CN1553592A (en) | 2004-12-08 |
| CN1324815C CN1324815C (en) | 2007-07-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958712A (en) * | 2010-11-10 | 2011-01-26 | 南京大学 | Analog phase-locked loop circuit without phase difference |
| CN101741451B (en) * | 2008-11-24 | 2013-04-24 | 财团法人工业技术研究院 | Polarized transmitter, phase modulator and phase modulation method |
| CN109787616A (en) * | 2019-01-17 | 2019-05-21 | 西安电子科技大学 | A kind of frequency signal switching system and switching method |
| CN111034139A (en) * | 2017-08-12 | 2020-04-17 | 日本电气株式会社 | Method and apparatus for determining phase tracking reference signal configuration parameters |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5128809A (en) * | 1989-06-29 | 1992-07-07 | Digital Equipment Corporation | Coherent multi-frequency synthesis |
| JPH10171549A (en) * | 1996-12-05 | 1998-06-26 | Mitsubishi Electric Corp | Pll clock driver device and lsi device |
| US5970110A (en) * | 1998-01-09 | 1999-10-19 | Neomagic Corp. | Precise, low-jitter fractional divider using counter of rotating clock phases |
| JP2001202155A (en) * | 2000-01-18 | 2001-07-27 | Hitachi Ltd | Low power consumption processor |
| CN1249924C (en) * | 2001-09-30 | 2006-04-05 | 中兴通讯股份有限公司 | Shake-removing circuit based on digital lock phase loop |
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2003
- 2003-06-06 CN CNB031408974A patent/CN1324815C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741451B (en) * | 2008-11-24 | 2013-04-24 | 财团法人工业技术研究院 | Polarized transmitter, phase modulator and phase modulation method |
| CN101958712A (en) * | 2010-11-10 | 2011-01-26 | 南京大学 | Analog phase-locked loop circuit without phase difference |
| CN111034139A (en) * | 2017-08-12 | 2020-04-17 | 日本电气株式会社 | Method and apparatus for determining phase tracking reference signal configuration parameters |
| CN111034139B (en) * | 2017-08-12 | 2022-11-04 | 日本电气株式会社 | Method and apparatus for determining phase tracking reference signal configuration parameters |
| US11895051B2 (en) | 2017-08-12 | 2024-02-06 | Nec Corporation | Methods and apparatuses for determining a phase tracking reference signal configuration parameter |
| CN109787616A (en) * | 2019-01-17 | 2019-05-21 | 西安电子科技大学 | A kind of frequency signal switching system and switching method |
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| CN1324815C (en) | 2007-07-04 |
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