CN106209095B - A kind of power combing Terahertz fixed ampllitude method based on phase adjustment - Google Patents
A kind of power combing Terahertz fixed ampllitude method based on phase adjustment Download PDFInfo
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- CN106209095B CN106209095B CN201610585927.5A CN201610585927A CN106209095B CN 106209095 B CN106209095 B CN 106209095B CN 201610585927 A CN201610585927 A CN 201610585927A CN 106209095 B CN106209095 B CN 106209095B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
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Abstract
A kind of power combing Terahertz fixed ampllitude method based on phase adjustment, using traditional intensity detector as amplitude detection, and it will test the lower-frequency envelope rectified signal of level as feedback quantity, driving power synthesizes the adjustment of the phase adaptation degree between each branch, realizes the adjustment function of final Terahertz output amplitude.In self feed back and makeover process, the output amplitude of terahertz signal can be clamped down on by feedback signal, so that the level magnitudes of the terahertz signal of output tend to be steady, to achieve the purpose that fixed ampllitude.
Description
Technical field
The invention belongs to field of signal processing, are related to a kind of method of adjustment of signal amplitude, especially suitable for Terahertz
The THz source that fixed ampllitude characteristic requires.
Background technique
Terahertz Technology is the hot spot of current academic research, can be applied to image objects, environmental monitoring, medical treatment are examined
Disconnected, radio astronomy, safety inspection, anti-terrorism detection, satellite communication and radar detection etc. and the close phase of national economy and social development
The field of pass, wherein THz source is one of an indispensable part.Although to the output power of THz source in practical application
There is strict demand, however the actual value of THz source output power still can not accurately be known at present, even foreign countries buy
Power meter not can guarantee after accuracy of measurement long-time use yet, and the domestic measurement means to such high-frequency apparatus are short of.
It needs to trace to the source to the output power of Terahertz thus, to obtain the means of power measurement.
During tracing to the source, need an amplitude that can keep stable terahertz signal source for a long time.At this stage, it obtains
Terahertz fixed ampllitude signal is extremely difficult, one is due to terahertz signal generation no matter optical instrument or electricity means it is sharp
It is generated with non-linear process, controlling its offset parameter cannot be guaranteed that signal is generated in preferable stable state, and control function
Monotonicity is not strong；The second is dynamic regulation is carried out using attenuator, but most of Terahertz attenuator is to manually adjust at this stage,
The response speed of reported a small amount of electrically controlled attenuator in submicrosecond magnitude, is unable to satisfy the demand of fast amplitude adjustment.
Summary of the invention
Technical problem solved by the present invention is having overcome the deficiencies of the prior art and provide a kind of function based on phase adjustment
Rate synthesizes Terahertz fixed ampllitude method, reaches output power amplitude quick flat by controlling the phase mismatch degree of power combing process
The purpose of weighing apparatus has response fast, it is easy to accomplish, the characteristics of high reliablity.
The technical solution of the invention is as follows: a kind of power combing Terahertz fixed ampllitude method based on phase adjustment, including
Following steps:
(1) fundamental frequency signal is generated using signal source, and power distribution is carried out to the fundamental frequency signal, form two-way fundamental frequency point
Supported signal；
(2) by two-way fundamental frequency branch signal feed-in phaselocked loop, each roadbed frequency division supported signal individually corresponds to a locking phase
Ring；The characteristic transmitted using phase linearity between frequency-doubled signal and fundamental frequency signal, by the way that wherein fundamental frequency branch signal is corresponding all the way
Phaselocked loop adjusts the phase delay of the roadbed frequency division supported signal, so that the phase difference of two-way fundamental frequency branch signal is 90 °/N, wherein
N is frequency multiplication number, and N is positive integer；
(3) to by step (2) processing two-way fundamental frequency branch signal carry out N frequency multiplication respectively, and to respective frequency multiplication after
Two-way fundamental frequency branch signal is synthesized, the terahertz signal after obtaining power combing；
(4) being obtained using directional coupler can drive the terahertz signal of the minimum power of wave detector to detect as feedback
Signal carries out envelope detection to feedback detection signal, extracts amplitude envelops feature as terahertz signal output power
Level character signal；
(5) the level character signal amplitude amount P obtained using step (4)outAs parameter, using formulaIt calculates, obtains the corrected parameter Δ φ to phaselocked loop, and carry out phase delay in write step (2)
The phaselocked loop of operation carries out phase feedback adjustment, the dynamic equilibrium of the terahertz signal after keeping power combing, and average power is
Certain value, A1And A2The respectively amplitude of two-way fundamental frequency branch signal.
Preferably, the mode of power distribution is carried out for constant amplitude distribution to fundamental frequency signal in the step (1).
Preferably, the feedback detection signal power is 1 ‰ of the terahertz signal power after power combing.
The advantages of the present invention over the prior art are that:
1, the prior art cannot achieve the dynamic fixed ampllitude of terahertz signal output power, therefore output signal is often with ring
The noise of border temperature change, the shake of DC bias signal and Terahertz frequency doubling device itself and randomized jitter, or even at big
The non-recurrence of amplitude curve changes；And the present invention realizes the tune of power dimension by the way of the adjusting of dynamic phase compensation formula
It is whole, enable Terahertz output signal that permanent amplitude is kept to export in real time；
2, the additional noise of frequency multiplier is superimposed upon the signal of feedback using input is used as after direct detection by conventional method
In, so that phase-adjusting circuit can not work normally.And the present invention greatly improves feedback letter by the way of envelope detection
Number to the validity of output power drift reflection, reliability greatly improved；
3, still lack the quick adjustment function to terahertz signal at present；And present invention employs the method for intermediate frequency phase shift,
The quick adjustment to terahertz signal phase may be implemented.
Detailed description of the invention
Fig. 1 is the schematic diagram of the method for the present invention；
Fig. 2 is the curve graph of relationship between two paths of signals combined coefficient and phase angle in the present invention；
Fig. 3 is in the present invention without the output signal level curve (black lines) of phase adaptation degree compensation and by phase
The output signal level curve of position collocation degree adjustment compensation (along the light tone narrowband of horizontal axis).
Specific embodiment
The present invention can be divided into two parts from technological layer: the phase adjustment of fixed ampllitude power output and use envelope detection are fed back
Network.Wherein the former mainly elaborate to control by fast phase the dynamic stability process for realizing signal output level and it is theoretical according to
According to；The latter elaborates that the feedback of signal is not general feedback system, the envelop feature extraction of signal must be carried out, for eliminating phase
Position noise bring interference.
(1) the phase adjustment theory analysis of fixed ampllitude power output
Power combing Terahertz fixed ampllitude method based on phase adjustment, realization process are mainly following two key mistake
Journey: by adjusting two paths of signals phase difference being 90 °, (state of other non-zero phase differences can also be with, but the case where 90 ° of phase differences
Most preferably, adjusting range is big) so that combined coefficient is 50%；Minimum detection is able to satisfy by the acquisition of directional couple device to require
Fraction power level, feed back to phase-adjusting circuit as reference signal after integral, specific implementation is as shown in Figure 1.
The theory for being combined power output is adjusted using phase mismatch degree and simulation result is as follows:
If two paths of signals is respectively S1=A1[cos (ω t)+jsin (ω t)], S2=A2[cos (ω t)+jsin (ω t)],
Wherein, S1And S2For the two paths of signals of hypothesis, A1And A2The amplitude for the two paths of signals respectively assumed, ω are the angular frequency of signal.
If the phase angle of two paths of signals is φ, the synthesis power expression of the two paths of signals are as follows:
Psum=| S1+S2|2=A1 2+A2 2+2A1A2cosφ (1)
And there is maximum synthesis power when the phase difference of two paths of signals is 0:
Pmax_sum=| S1+S2|2=A1 2+A2 2+2A1A2 (2)
In addition, always there is a real number a that can make A1=aA2(a ∈ R) is set up, then combined coefficient can indicate are as follows:
It is approximately equal by the amplitude for adjusting two paths of signals so that a ≈ 1, then (3) formula can abbreviation be (4) formula,
Wherein η is power combining efficiency, phase angle of the φ between two paths of signals, the curved line relation of the two as shown in Fig. 2,
Wherein abscissa is the phase included angle of two paths of signals, and ordinate is combined coefficient η.In the present invention, the first of two paths of signals is set
Beginning phase difference is 90 °, and adjusting process is fine tuning, therefore the phase difference of two paths of signals can be all around about 90 ° fine motions, then
(4) formula can be approximately:
Wherein Δ φ is the adjusting offset variable quantity of two paths of signals, and the approximation of this equation can also be obtained from Fig. 2, two
When road signal included angle is near 90 °, combined coefficient curve approximation is straight line.
To be combined signal as output signal in the present invention, therefore the power level of output signal is Pout=η Pmax_sum=
η(A1+A2)2, by (5) Shi Ke get:
It, can be by the phase of two paths of signals by (6) formula it is found that output power caused by being changed by amplitude in two paths of signals changes
Collocation degree adjusts to be made up, and it is constant for finally making output power.
Fig. 3 is wherein to be superimposed amplitude white noise on signal all the way in the two paths of signals of design, is calculated by matlab
The data (the intensive solid line of Fig. 3 black) of signal normalization after the synthesis that signal after to synthesis adds noiseless.By to defeated
The amplitude acquisition of signal out is calculated using (6) formula after compensating dynamic adjustment to phase, and output signal is by noiseless addition
After synthesis after signal normalization data as shown in white narrowband of the Fig. 3 along horizontal axis.The setting feedback control loop speed of response is width herein
90% calculating of degree flashing rate, it is seen that its Adjustment precision can promote 30dB.
(2) theory analysis of envelope detection feedback network is used
Theory analysis using envelope detection feedback network is as follows:
20lgN is deferred in the terahertz signal that frequency multiplication generates, deterioration of mutually making an uproar, and wherein N is frequency multiplication number.Pass through microwave multiple-frequency
Frequency to the technological means of Terahertz, generation is higher, and N is bigger, and then deterioration of mutually making an uproar is more serious, this is that low frequency signal frequency multiplication produces
The intrinsic problem of raw terahertz signal.And mutually make an uproar and be embodied in phase jitter in the time domain, it is shown as in combining power output
Output level is quivered (jitter), since the mathematic expectaion of random phase fluctuation amplitude is 0, is generally pressed to its measurement index
It is calculated according to root-mean-square value, such as (7) formula:
Wherein PPNFor power spectrum single-side belt integrated value of mutually making an uproar, unit dB.The finger of mutually making an uproar in test source in the embodiment of the present invention
It is designated as -51.3dBc@1KHz, conversion jitter root-mean-square value is 0.086 (4.9 °), synthesizes power output at this time and quivers maximum value
And the difference of minimum value is 8.6%, therefore in order to enable phase adaptation degree adjustment process can be effectively to the slow drift of power output
Shifting is corrected, it is necessary to which the flashing of the power caused by jitter is handled, and the side for using envelope detection is proposed in the present invention
Method filters disturbance of the jitter to feedback signal.
It is noted that not influencing the defeated of signal in prolonged accumulation since the mathematic expectaion of jitter is 0
Power level index out, and the quick variation of jitter, so that can not be perceived in actual detection, therefore the method for the present invention is not right
The flashing of power level caused by jitter is fed back, and is not influenced the output of fixed ampllitude signal not only, instead amplitude was adjusted
Journey is more targeted.
Accordingly, the key step of the method for the present invention is as follows:
(1) fundamental frequency signal and power divider are connected
As shown in Figure 1, fundamental frequency signal is connected with power divider, the power distribution (distribution ratio of fundamental frequency signal is realized
Example is unlimited, and optimal allocation mode is constant amplitude distribution), form multichannel fundamental frequency branch signal.If being here formed as the road R branch signal, then
It is believed that the road R-1 signal is synthesized according to the power combing mode of highest combined coefficient, phase is not carried out according to feedback to it
Position control, but phase controlling is only carried out all the way to remaining, therefore the road R branch signal herein still can be treated as two-way
Signal processing.
(2) each tributary signal feed-in phaselocked loop for exporting power divider
As shown in Figure 1, the output signal of power divider is directly connected with corresponding phaselocked loop, only to one of them
Branch carries out phase dynamic regulation.
Signal optimum phase difference after the output of two-way frequency multiplication is 90 °, therefore when frequency multiplication number is N, the branch being adjusted
Phase preset is 90 °/N at the phase difference of another way.Frequency multiplication number is 15 in this example, therefore the phase difference of controlled branch is preset
It is 6 °.
(3) the output signal feed-in frequency multiplier of phaselocked loop
By the output signal feed-in frequency multiplier of phaselocked loop.In the embodiment of the present invention, frequency multiplier is 15 frequencys multiplication namely N is 15,
Therefore the phase difference variable of the terahertz signal of output is 6 ° × 15=90 °.
(4) the terahertz signal power combing for exporting frequency multiplier
The terahertz signal access power synthesizer that frequency multiplier is exported, is allowed to complete power combing.
(5) feedback signal is negated
The output signal of power combiner is taken by directional coupler can drive wave detector minimum power (herein with
Feedback link receiving sensor sensitivity is related, just drives the power of sensor, excessively high Feedback of Power delivery efficiency
Necessarily decline, too low input pickup is not comparatively laborious in linear zone correction work), for feeding back.In the embodiment of the present invention
The 1 ‰ of the number of winning the confidence.Remaining most signal is for exporting.
(6) envelope detection is carried out to feedback signal
Envelope detection is carried out to the feedback signal that directional coupler takes out, and passes through low-pass filter filter high-frequency feature,
To extract amplitude envelops feature, as terahertz signal output power levels characteristic signal.
(7) feedback driving phaselocked loop completes phase real time correction
The level character signal amplitude amount that step (6) are generated is calculated by (6) formula to phaselocked loop as parameter
Corrected parameter Δ φ, and phaselocked loop is written and carries out phase adjustment, complete the dynamic process of Terahertz fixed ampllitude.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (3)
1. a kind of power combing Terahertz fixed ampllitude method based on phase adjustment, it is characterised in that include the following steps:
(1) fundamental frequency signal is generated using signal source, and power distribution is carried out to the fundamental frequency signal, form two-way fundamental frequency branch letter
Number；
(2) by two-way fundamental frequency branch signal feed-in phaselocked loop, each roadbed frequency division supported signal individually corresponds to a phaselocked loop；Benefit
The characteristic transmitted with phase linearity between frequency-doubled signal and fundamental frequency signal passes through the wherein corresponding phaselocked loop of fundamental frequency branch signal all the way
The phase delay of the roadbed frequency division supported signal is adjusted, so that the phase difference of two-way fundamental frequency branch signal is 90 °/N, wherein N is times
Frequency number, N are positive integer；
(3) N frequency multiplication is carried out respectively to the two-way fundamental frequency branch signal by step (2) processing, and to the two-way after respective frequency multiplication
Fundamental frequency branch signal is synthesized, the terahertz signal after obtaining power combing；
(4) being obtained using directional coupler can drive the terahertz signal of the minimum power of wave detector as feedback detection letter
Number, envelope detection is carried out to feedback detection signal, extracts amplitude envelops feature as terahertz signal output power
Level character signal；
(5) the level character signal amplitude amount P obtained using step (4)outAs parameter, using formulaIt calculates, obtains the corrected parameter Δ φ to phaselocked loop, and carry out phase delay in write step (2)
The phaselocked loop of operation carries out phase feedback adjustment, and the average power of the terahertz signal after keeping power combing is certain value, A1
And A2The respectively amplitude of two-way fundamental frequency branch signal.
2. a kind of power combing Terahertz fixed ampllitude method based on phase adjustment according to claim 1, it is characterised in that:
The mode of power distribution is carried out in the step (1) to fundamental frequency signal as constant amplitude distribution.
3. a kind of power combing Terahertz fixed ampllitude method based on phase adjustment according to claim 1 or 2, feature exist
In: the feedback detection signal power is 1 ‰ of the terahertz signal output power after power combing.
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| CN113092876B (en) * | 2021-03-30 | 2022-03-15 | 电子科技大学 | Millimeter wave phase change detection method and system based on power combining efficiency theory |
| CN114567322B (en) * | 2022-03-28 | 2024-10-01 | 成都威频科技有限公司 | Low-phase noise frequency source circuit and implementation method |
| CN116366059B (en) * | 2023-04-10 | 2024-02-06 | 东西分析(永清)仪器有限公司 | Radio frequency power synthesis circuit and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254959A (en) * | 1991-06-28 | 1993-10-19 | U.S. Philips Corporation | Frequency synthesizer having phase control loop with plural branches |
| US5313173A (en) * | 1993-04-26 | 1994-05-17 | Ericsson Ge Mobile Communications Inc. | Quadrature modulated phase-locked loop |
| CN101545930A (en) * | 2008-03-26 | 2009-09-30 | 中国科学院电子学研究所 | Phase detection method based on only amplitude detection |
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- 2016-07-22 CN CN201610585927.5A patent/CN106209095B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5254959A (en) * | 1991-06-28 | 1993-10-19 | U.S. Philips Corporation | Frequency synthesizer having phase control loop with plural branches |
| US5313173A (en) * | 1993-04-26 | 1994-05-17 | Ericsson Ge Mobile Communications Inc. | Quadrature modulated phase-locked loop |
| CN101545930A (en) * | 2008-03-26 | 2009-09-30 | 中国科学院电子学研究所 | Phase detection method based on only amplitude detection |
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