CN108680789B - Phase-sensitive detector and phase sensitive detection method based on frequency multiplier and sampling holder - Google Patents
Phase-sensitive detector and phase sensitive detection method based on frequency multiplier and sampling holder Download PDFInfo
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Abstract
The invention discloses a kind of phase-sensitive detector based on frequency multiplier and sampling holder and phase sensitive detection methods, wherein, phase-sensitive detector includes: forcing function generator, zero-crossing comparator, frequency multiplier, sampling pulse generation circuit, first to fourth sampling holder, first subtracter is connected with the first sampling holder and the second sampling holder respectively, for subtracting each other the output signal of the first sampling holder and the second sampling holder, to obtain vertical phase signal；Second subtracter is for subtracting each other the output signal of third sampling holder and the 4th sampling holder, to obtain horizontal phase signal.The phase-sensitive detector can carry out signal acquisition in stationary phase point to suspect signal by zero-crossing comparator, frequency multiplier, sampling pulse generation circuit and sampling holder, vertical phase signal and horizontal phase signal are exported by subtracter and low-pass filter again, effectively improve detection accuracy and stability, it has the advantages of simple structure and easy realization.
Description
Technical field
It is the present invention relates to signal demodulation techniques field, in particular to a kind of to be examined based on the phase sensitivity of frequency multiplier and sampling holder
Wave device and phase sensitive detection method.
Background technique
Signal demodulation has important application in the detection system.Such as in EDDY CURRENT, the sine wave conduct of high frequency
Carrier wave, due to eddy current effect, flaw indication can be modulated onto carrier wave, by signal demodulation techniques, can effectively be restored scarce
Signal is fallen into, and improves the signal-to-noise ratio of signal.It is widely answered in addition, signal demodulation also has in communication system and spectral technique
With.
In numerous demodulation techniques, phase sensitive detection technology has very important status.Phase-sensitive detector is to reference
Phase difference between signal and suspect signal carries out detection, and the frequency of the two signals is identical.
In traditional simulation phase sensitive detection technology, generally using multiplier and low-pass filter as core.Suspect signal passes through
Multiplier is multiplied with the reference signal of a pair of orthogonal respectively, then obtained signal is filtered its high frequency division by low-pass filter
Amount, it includes suspect signal that the DC component left is projection of the suspect signal on two orthogonal reference signals among these
Phase information.But simulation phase sensitive detection technology, there is many disadvantages, such as multiplier poor linearity, low frequency response is poor,
And the influence vulnerable to factors such as low-frequency noise, temperature drift and offset currents.
The phase accuracy of orthogonal reference signal directly affects the performance of phase-sensitive detection circuit, and the acquisition of two-way orthogonal signalling is logical
Often phase-shift circuit is needed to complete.Phase-shift circuit refers to two-way homogenous frequency signal, wherein all the way for reference, to carry out phase to another way
Position is advanced or the adjustment of lag.Influence of the phase-shift circuit vulnerable to input waveform and temperature is simulated, there is wave distortions and defeated
Postpone out, phase accuracy is not high.And phase-shift circuit complex structural designs, development cost are high.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of phase-sensitive detector based on frequency multiplier and sampling holder,
The phase-sensitive detector can effectively improve detection accuracy and stability, have the advantages of simple structure and easy realization.
It is another object of the present invention to propose a kind of phase sensitive detection method based on frequency multiplier and sampling holder.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of phase based on frequency multiplier and sampling holder
Quick wave detector, comprising: forcing function generator, for generate and suspect signal with frequency sinusoidal reference signal；Zero-crossing comparator, it is described
Zero-crossing comparator is connected with the forcing function generator, for the sinusoidal reference signal to be converted to the square-wave signal of same frequency；Times
Frequency device, the frequency multiplier are connected with the zero-crossing comparator, double for the frequency to the square-wave signal, will be described
The frequency of square-wave signal increases to twice；Sampling pulse generation circuit, the sampling pulse generation circuit respectively with the zero passage ratio
It is connected compared with device with the frequency multiplier, to generate first to fourth sampling pulse signal with corresponding reference signal with frequency, wherein arteries and veins
Punching is located at 0 °, 90 °, 180 ° and 270 ° phase of the corresponding reference signal；First to fourth sampling holder, it is described
First to fourth sampling holder is connected with the sampling pulse generation circuit, is believed according to first to fourth sampling pulse
The acquisition of range value number is carried out at fixed phase to the suspect signal of input；First subtracter, first subtraction
Device is connected with the first sampling holder and the second sampling holder respectively, is used for first sampling holder and described second
The output signal of sampling holder is subtracted each other, to obtain vertical phase signal；Second subtracter, second subtracter is respectively with
Three sampling holders and the 4th sampling holder are connected, and are used for the third sampling holder and the 4th sampling holder
Output signal subtract each other, to obtain horizontal phase signal.
The phase-sensitive detector based on frequency multiplier and sampling holder of the embodiment of the present invention, it is only necessary to which reference signal is just all the way
The problem of can completing phase sensitive detection process, avoiding phase accuracy brought by two-way orthogonal reference signal；Without using multiplying
Musical instruments used in a Buddhist or Taoist mass is avoided by multiplier bring poor linearity, low frequency response difference and is lacked vulnerable to what noise, temperature drift and offset current influenced
Point, circuit system stability improve；And circuit overall structure is simplified, and debugging is easy, easy to maintain.
In addition, the phase-sensitive detector according to the above embodiment of the present invention based on frequency multiplier and sampling holder can also have
There is following additional technical characteristic:
Further, in one embodiment of the invention, further includes: the first low-pass filter and the second low-pass filtering
Device, first low-pass filter are connected with first subtracter, second low-pass filter and second subtracter
It is connected, is respectively used to carry out smothing filtering to the vertical phase signal and the horizontal phase signal.
Further, in one embodiment of the invention, the zero-crossing comparator is further used for the sinusoidal ginseng
Signal and zero balancing are examined, to export logic 1 when being greater than zero, and less than zero when exports logical zero, so that the sinusoidal reference be believed
Number it is converted into the square-wave signal of the same frequency.
Further, in one embodiment of the invention, first to fourth sampling holder is further used for
When control terminal is high level, the output signal of sampling holder will be equal to the input signal of the point, with to the suspect signal 4
Signal acquisition is carried out at a stationary phase, the output result of first to fourth sampling holder is respectively as follows:
Wherein, Vo1And Vo2It is the input signal of first subtracter, Vo3And Vo4It is the defeated of second subtracter
Entering signal, A is the amplitude of the suspect signal,It is the initial phase of the suspect signal.
Further, in one embodiment of the invention, wherein
The vertical phase signal are as follows:
The horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of first subtracter output, and X (t) is second subtracter output
Horizontal phase signal.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of based on frequency multiplier and sampling holder
Phase sensitive detection method, comprising the following steps: generate and suspect signal with frequency sinusoidal reference signal；By the sinusoidal reference signal
Be converted to the square-wave signal of same frequency；The frequency of the square-wave signal is doubled, the frequency of the square-wave signal is increased to
Twice；It generates with corresponding reference signal with first to fourth sampling pulse signal of frequency, wherein pulse is located at the correspondence
At 0 °, 90 °, 180 ° and 270 ° phase of reference signal；According to first to fourth sampling pulse signal to described in input
Suspect signal carries out the acquisition of range value at fixed phase；First sampling holder and second sampling are kept
The output signal of device is subtracted each other, to obtain vertical phase signal；By the third sampling holder and the 4th sampling holder
Output signal subtract each other, to obtain horizontal phase signal.
The phase sensitive detection method based on frequency multiplier and sampling holder of the embodiment of the present invention, it is only necessary to reference signal all the way
The problem of can completing phase sensitive detection process, avoiding phase accuracy brought by two-way orthogonal reference signal；Without using
Multiplier is avoided by multiplier bring poor linearity, low frequency response difference and vulnerable to the influence of noise, temperature drift and offset current
Disadvantage, circuit system stability improve；And circuit overall structure is simplified, and debugging is easy, easy to maintain.
In addition, the phase sensitive detection method according to the above embodiment of the present invention based on frequency multiplier and sampling holder can be with
With following additional technical characteristic:
Further, in one embodiment of the invention, further includes: to the vertical phase signal and the horizontal phase
Position signal carries out smothing filtering.
Further, in one embodiment of the invention, the zero-crossing comparator is further used for the sinusoidal ginseng
Signal and zero balancing are examined, to export logic 1 when being greater than zero, and less than zero when exports logical zero, so that the sinusoidal reference be believed
Number it is converted into the square-wave signal of the same frequency.
Further, in one embodiment of the invention, first to fourth sampling holder is further used for
When control terminal is high level, the output signal of sampling holder will be equal to the input signal of the point, with to the suspect signal 4
Signal acquisition is carried out at a stationary phase, the output result of first to fourth sampling holder is respectively as follows:
Wherein, Vo1And Vo2It is the input signal of first subtracter, Vo3And Vo4It is the defeated of second subtracter
Entering signal, A is the amplitude of the suspect signal,It is the initial phase of the suspect signal.
Further, in one embodiment of the invention, wherein
The vertical phase signal are as follows:
The horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of first subtracter output, and X (t) is second subtracter output
Horizontal phase signal.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the structural representation according to the phase-sensitive detector based on frequency multiplier and sampling holder of the embodiment of the present invention
Figure；
Fig. 2 is the schematic diagram according to the sampling pulse generation circuit functional block diagram of one embodiment of the invention；
Fig. 3 is the schematic diagram that part signal figure is handled according to the reference signal of one embodiment of the invention；
Fig. 4 is the flow chart according to the phase sensitive detection method based on frequency multiplier and sampling holder of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Describe to propose according to embodiments of the present invention with reference to the accompanying drawings is examined based on the phase sensitivity of frequency multiplier and sampling holder
Wave device and phase sensitive detection method, describe to propose according to embodiments of the present invention first with reference to the accompanying drawings is protected based on frequency multiplier and sampling
The phase-sensitive detector of holder.
Fig. 1 is the structural schematic diagram of the phase-sensitive detector based on frequency multiplier and sampling holder of the embodiment of the present invention.
As shown in Figure 1, being somebody's turn to do the phase-sensitive detector 10 based on frequency multiplier and sampling holder includes: forcing function generator 100, mistake
Zero comparator 200, frequency multiplier 300, sampling pulse generation circuit 400, first to fourth sampling holder 500, the first subtracter
600 and second subtracter 700.
Wherein, forcing function generator 100 be used for generate and suspect signal with frequency sinusoidal reference signal.Zero-crossing comparator 200
It is connected with forcing function generator 100, for sinusoidal reference signal to be converted to the square-wave signal of same frequency.Frequency multiplier 300 and zero passage ratio
It is connected compared with device 200, is doubled for the frequency to square-wave signal, the frequency of square-wave signal is increased to twice.Sampling pulse
Generation circuit 400 is connected with zero-crossing comparator 200 and frequency multiplier 300 respectively, to generate with corresponding reference signal first with frequency
To the 4th sampling pulse signal, wherein pulse is located at 0 °, 90 °, 180 ° and 270 ° phase of corresponding reference signal；The
One to the 4th sampling holder 500 is connected with sampling pulse generation circuit 400, according to first to fourth sampling pulse signal pair
The suspect signal of input carries out the acquisition of range value at fixed phase.First subtracter 600 is kept with the first sampling respectively
Device 501 is connected with the second sampling holder 502, for by the output of the first sampling holder 501 and the second sampling holder 502
Signal subtraction, to obtain vertical phase signal；Second subtracter 700 is protected with third sampling holder 503 and the 4th sampling respectively
Holder 504 is connected, for subtracting each other the output signal of third sampling holder 503 and the 4th sampling holder 504, to obtain water
Flat phase signal.The phase-sensitive detector 10 of the embodiment of the present invention solves phase sensitive detection system phase-shift circuit phase in the related technology
Precision is not high and multiplier poor linearity for position, and low frequency response is poor, vulnerable to the factors shadow such as low-frequency noise, temperature drift and offset current
Loud problem.
Further, in one embodiment of the invention, the phase-sensitive detector 10 of the embodiment of the present invention further include: first
Low-pass filter 800 and the second low-pass filter 900.Wherein, the first low-pass filter 800 is connected with the first subtracter 600, the
Two low-pass filters 900 are connected with the second subtracter 700, are respectively used to carry out vertical phase signal and horizontal phase signal flat
Sliding filtering.
It is understood that since simulation phase-sensitive detection circuit reference signal phase accuracy is not high, multiplier poor linearity,
Low frequency respective differences, the shortcomings that influence vulnerable to noise, temperature drift and offset current, the embodiment of the present invention can by based on frequency multiplier and
The phase-sensitive detector of sampling holder preferably improves disadvantages mentioned above.
Specifically, as shown in Figure 1, the suspect signal of the embodiment of the present invention is the electric signal V (t) for needing to demodulate, with reference to letter
It number is the sinusoidal signal with it with frequency.The generation of reference signal and processing module include forcing function generator 100, zero-crossing comparator
200, frequency multiplier 300 and sampling pulse generation circuit 400.Believe with reference signal with the pulse of frequency by handling available four
Number, the pulse of this four pulse signals be located at 0 ° of reference signal, 90 °, 180 °, at 270 ° of phases.With this four pulses
Signal is as sampling holder, i.e. the control signal of first to fourth sampling holder 500, so as to collect suspect signal
Rectified signal both horizontally and vertically can be obtained in the range value in stationary phase site after subtracter and low-pass filter.
That is, forcing function generator 100 can be used for generation and suspect signal with the sinusoidal reference signal of frequency.Zero passage ratio
Sinusoidal signal and zero balancing can be exported logic 1 when comparison result is greater than zero compared with device 200, export logical zero when less than zero,
To convert sinusoidal signal to the square wave of same frequency.The square-wave signal that frequency multiplier 300 can be used for generating zero-crossing comparator
Frequency becomes original twice.Sampling pulse generation circuit 400 can be used for generating the sampling arteries and veins of four and reference signal with frequency
Rush signal, pulse be located at 0 ° of former reference signal, 90 °, 180 °, at 270 ° of phases.The input signal of sampling holder 500
For suspect signal, it is connected to the control terminal of sampling holder by the four road pulse signals that sampling pulse generation circuit generates, treats
Inspection signal carries out the acquisition of range value at fixed phase.First subtracter 600 adopts the first sampling holder 501 and second
The output signal of sample retainer 502 is subtracted each other, and obtains vertical phase signal, and the second subtracter 700 is by 503 He of the first sampling holder
The output signal of 4th sampling holder 504 is subtracted each other, and horizontal phase signal is obtained.Low-pass filter is used for smothing filtering.
Further, in one embodiment of the invention, zero-crossing comparator 200 is further used for sinusoidal reference signal
With zero balancing, to export logic 1 when being greater than zero, and less than zero when exports logical zero, to convert sinusoidal reference signal to together
The square-wave signal of frequency.
It is understood that the zero-crossing comparator 200 of the embodiment of the present invention can by sinusoidal signal and zero balancing, and
Comparison result exports logic 1 when being greater than zero, logical zero is exported when less than zero, to convert sinusoidal signal to the square wave of same frequency.
Further, in one embodiment of the invention, first to fourth sampling holder is further used for controlling
When end is high level, the output signal of sampling holder will be equal to the input signal of the point, with to suspect signal in 4 stationary phases
Signal acquisition at position, the output result of first to fourth sampling holder are respectively as follows:
Wherein, Vo1And Vo2It is the input signal of the first subtracter, Vo3And Vo4It is the input signal of the second subtracter, A
It is the amplitude of the suspect signal,It is the initial phase of the suspect signal.
Further, in one embodiment of the invention, wherein
Vertical phase signal are as follows:
Horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of the first subtracter output, and X (t) is the horizontal phase of the second subtracter output
Position signal.
For example, suspect signal is the electric signal V (t) for needing to demodulate, and is indicated are as follows:
Wherein, A is the amplitude of signal, and ω is angular frequency,It is initial phase.
The reference signal that forcing function generator generates is the sine wave with suspect signal with 0 ° of phase of frequency, is indicated are as follows:
R1(t)=sin (ω t),
The signal that forcing function generator generates is inputed into zero-crossing comparator, in the positive half cycle of sinusoidal signal, zero-crossing comparator
Logic 1 can be exported, in negative half period, then can export logical zero, to convert sinusoidal signal to the square wave R of same frequency2(t)。
The signal that zero-crossing comparator is generated inputs frequency multiplier, available two frequencys multiplication square-wave signal R3(t)。
There are many implementations for sampling pulse generation circuit, and here only by taking one kind as an example, structural block diagram is as shown in Figure 2.
With reference sinusoidal signal with the square-wave signal R of frequency2(t) pass through monostable flipflop 1 and monostable flipflop respectively
2。
Monostable flipflop 1 is triggered by rising edge, R2(t) position of rising edge is 0 ° of phase of reference signal, from
And the adjustable pulse signal of pulse width can be generated at 0 ° of phase, it is denoted as P0。
Monostable flipflop 2 is triggered by failing edge, R2(t) position of failing edge is 180 ° of phases of reference signal
Position is denoted as P so as to generate an adjustable pulse signal of pulse width at 180 ° of phases180。
Monostable flipflop 3 is triggered by failing edge, and frequency-doubled signal can generate arteries and veins after passing through at 90 ° and 270 ° of phases
Rush signal.By itself and square-wave signal R2(t) it does and operation, then the available pulse signal being located at 90 ° of phases, is denoted as P90。
By square-wave signal R2(t) it negates, then the signal generated with monostable flipflop 3 is done and operation, then available position
Pulse signal at 270 ° of phases, is denoted as P270.Wherein, the signal graph of reference signal processing part is as shown in Figure 3.
The input signal of 4 sampling holders is suspect signal V (t), 4 road pulse signal P of control termination0, P180, P90,
P270, when control terminal is high level, the output signal of sampling holder will be equal to the input signal of the point, so as to complete right
Signal acquisition of the suspect signal at 4 stationary phases.The output result of 4 sampling holders is respectively as follows:
The input signal of first subtracter is Vo1And Vo2, the input signal of the second subtracter is Vo3And Vo4。
First subtracter exports vertical phase signal:
Second subtracter output level phase signal:
In the case where suspect signal phase changes over time, the output of subtracter is stepped analog voltage signal,
It smoothly can be the signal of continuous and derivable by it using low-pass filter.
To sum up, the phase-sensitive detector based on frequency multiplier and sampling holder proposed according to embodiments of the present invention, it is only necessary to
Reference signal can complete phase sensitive detection process all the way, avoid asking for phase accuracy brought by two-way orthogonal reference signal
Topic；Without using multiplier, avoid by multiplier bring poor linearity, low frequency response difference and vulnerable to noise, temperature drift and mistake
The shortcomings that adjusting electric current to influence, circuit system stability improve；And circuit overall structure is simplified, and debugging is easy, easy to maintain.
It is examined referring next to what attached drawing description proposed according to embodiments of the present invention based on the phase sensitivity of frequency multiplier and sampling holder
Wave method.
Fig. 4 is the flow chart of the phase sensitive detection method based on frequency multiplier and sampling holder of the embodiment of the present invention.
As shown in figure 4, should phase sensitive detection method based on frequency multiplier and sampling holder the following steps are included:
In step S401, generate and suspect signal with frequency sinusoidal reference signal.
In step S402, sinusoidal reference signal is converted to the square-wave signal of same frequency.
In step S403, the frequency of square-wave signal is doubled, the frequency of square-wave signal is increased to twice.
In step s 404, it generates with corresponding reference signal with first to fourth sampling pulse signal of frequency, wherein pulse
It is located at 0 °, 90 °, 180 ° and 270 ° phase of corresponding reference signal.
In step S405, according to first to fourth sampling pulse signal to the suspect signal of input at fixed phase
Carry out the acquisition of range value.
In step S406, the output signal of the first sampling holder and the second sampling holder is subtracted each other, to be hung down
Straight phase signal.
In step S 407, the output signal of third sampling holder and the 4th sampling holder is subtracted each other, to obtain water
Flat phase signal.
Further, in one embodiment of the invention, further includes: to vertical phase signal and horizontal phase signal into
Row smothing filtering.
Further, in one embodiment of the invention, zero-crossing comparator be further used for by sinusoidal reference signal with
Zero balancing, to export logic 1 when being greater than zero, and less than zero when exports logical zero, to convert sinusoidal reference signal to frequency
Square-wave signal.
Further, in one embodiment of the invention, first to fourth sampling holder is further used for controlling
When end is high level, the output signal of sampling holder will be equal to the input signal of the point, with to suspect signal in 4 stationary phases
Signal acquisition at position, the output result of first to fourth sampling holder are respectively as follows:
Wherein, VO1And Vo2It is the input signal of the first subtracter, Vo3And Vo4It is the input signal of the second subtracter, A
It is the amplitude of the suspect signal,It is the initial phase of the suspect signal.
Further, in one embodiment of the invention, wherein
Vertical phase signal are as follows:
Horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of the first subtracter output, and X (t) is the horizontal phase of the second subtracter output
Position signal.
It should be noted that aforementioned to the explanation based on frequency multiplier and the phase-sensitive detector embodiment of sampling holder
It is also applied for the phase sensitive detection method based on frequency multiplier and sampling holder of the embodiment, details are not described herein again.
The phase sensitive detection method based on frequency multiplier and sampling holder proposed according to embodiments of the present invention, it is only necessary to all the way
The problem of reference signal can complete phase sensitive detection process, avoid phase accuracy brought by two-way orthogonal reference signal；
Without using multiplier, avoid by multiplier bring poor linearity, low frequency response difference and vulnerable to noise, temperature drift and imbalance electricity
The shortcomings that stream influences, circuit system stability improve；And circuit overall structure is simplified, and debugging is easy, easy to maintain.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of phase-sensitive detector based on frequency multiplier and sampling holder characterized by comprising
Forcing function generator, for generate and suspect signal with frequency sinusoidal reference signal；
Zero-crossing comparator, the zero-crossing comparator are connected with the forcing function generator, for converting the sinusoidal reference signal
For the square-wave signal of same frequency；
Frequency multiplier, the frequency multiplier are connected with the zero-crossing comparator, double for the frequency to the square-wave signal, with
The frequency of the square-wave signal is increased to twice；
Sampling pulse generation circuit, the sampling pulse generation circuit respectively with the zero-crossing comparator and the frequency multiplier phase
Even, to generate first to fourth sampling pulse signal with corresponding reference signal with frequency, wherein pulse is located at the correspondence
At 0 °, 90 °, 180 ° and 270 ° phase of reference signal；
First to fourth sampling holder, first to fourth sampling holder with the sampling pulse generation circuit phase
Even, range value is carried out to the suspect signal of input at fixed phase according to first to fourth sampling pulse signal
Acquisition；
First subtracter, first subtracter are connected with the first sampling holder and the second sampling holder respectively, and being used for will
The output signal of first sampling holder and second sampling holder is subtracted each other, to obtain vertical phase signal；And
Second subtracter, second subtracter are connected with third sampling holder and the 4th sampling holder respectively, and being used for will
The output signal of the third sampling holder and the 4th sampling holder is subtracted each other, to obtain horizontal phase signal.
2. the phase-sensitive detector according to claim 1 based on frequency multiplier and sampling holder, further includes:
First low-pass filter and the second low-pass filter, first low-pass filter are connected with first subtracter, institute
It states the second low-pass filter to be connected with second subtracter, be respectively used to the vertical phase signal and the horizontal phase
Signal carries out smothing filtering.
3. the phase-sensitive detector according to claim 1 based on frequency multiplier and sampling holder, which is characterized in that the mistake
Zero comparator is further used for the sinusoidal reference signal and zero balancing, to export logic 1 when being greater than zero, and when less than zero
Logical zero is exported, to convert the sinusoidal reference signal to the square-wave signal of the same frequency.
4. the phase-sensitive detector according to claim 1-3 based on frequency multiplier and sampling holder, feature exist
In first to fourth sampling holder is further used for when control terminal is high level, the output signal of sampling holder
Input signal will be equal to, with the signal acquisition to the suspect signal at 4 stationary phases, first to fourth sampling is protected
The output result of holder is respectively as follows:
Wherein, Vo1And Vo2It is the input signal of first subtracter, Vo3And Vo4It is the input letter of second subtracter
Number, A is the amplitude of the suspect signal,It is the initial phase of the suspect signal.
5. the phase-sensitive detector according to claim 4 based on frequency multiplier and sampling holder, which is characterized in that wherein,
The vertical phase signal are as follows:
The horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of first subtracter output, and X (t) is the water of second subtracter output
Flat phase signal.
6. a kind of phase sensitive detection method based on frequency multiplier and sampling holder, which is characterized in that any using claim 1-5
The phase-sensitive detector based on frequency multiplier and sampling holder described in, wherein method includes the following steps:
Generate and suspect signal with frequency sinusoidal reference signal；
The sinusoidal reference signal is converted to the square-wave signal of same frequency；
The frequency of the square-wave signal is doubled, the frequency of the square-wave signal is increased to twice；
It generates with corresponding reference signal with first to fourth sampling pulse signal of frequency, wherein pulse is located at the correspondence
At 0 °, 90 °, 180 ° and 270 ° phase of reference signal；
Amplitude is carried out at fixed phase to the suspect signal of input according to first to fourth sampling pulse signal
The acquisition of value；
The output signal of first sampling holder and second sampling holder is subtracted each other, to obtain vertical phase letter
Number；
The output signal of the third sampling holder and the 4th sampling holder is subtracted each other, to obtain horizontal phase letter
Number.
7. the phase sensitive detection method according to claim 6 based on frequency multiplier and sampling holder, which is characterized in that also wrap
It includes:
Smothing filtering is carried out to the vertical phase signal and the horizontal phase signal.
8. the phase sensitive detection method according to claim 6 based on frequency multiplier and sampling holder, which is characterized in that described
Further comprise by the square-wave signal that the sinusoidal reference signal is converted to same frequency: by the sinusoidal reference signal and zero balancing,
To export logic 1 when being greater than zero, and less than zero when exports logical zero, to convert the sinusoidal reference signal to described same
The square-wave signal of frequency.
9. according to the described in any item phase sensitive detection methods based on frequency multiplier and sampling holder of claim 6-8, feature
It is, first to fourth sampling holder is further used for when control terminal is high level, the output letter of sampling holder
Number will be equal to input signal, with the signal acquisition to the suspect signal at 4 stationary phases, it is described first to fourth sampling
The output result of retainer is respectively as follows:
Wherein, Vo1And Vo2It is the input signal of first subtracter, Vo3And Vo4It is the input letter of second subtracter
Number, A is the amplitude of signal,It is initial phase.
10. the phase sensitive detection method according to claim 9 based on frequency multiplier and sampling holder, which is characterized in that its
In,
The vertical phase signal are as follows:
The horizontal phase signal are as follows:
Wherein, Y (t) is the vertical phase signal of first subtracter output, and X (t) is the water of second subtracter output
Flat phase signal.
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