CN106093572A - High-precision phase position testing circuit based on integrated phase discriminator AD8302 and method for self-calibrating thereof - Google Patents
High-precision phase position testing circuit based on integrated phase discriminator AD8302 and method for self-calibrating thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/04—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents involving adjustment of a phase shifter to produce a predetermined phase difference, e.g. zero difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a kind of high-precision phase position testing circuit based on integrated phase discriminator AD8302 and method for self-calibrating thereof, wherein, this phase detecting circuit includes: integrated phase discriminator AD8302, the input of integrated phase discriminator AD8302 connects two paths of signals input channel, two radio-frequency relays that can carry out ledger line and not ledger line two states switching are installed on the signal input channel of the most any one road, the output valve of the integrated phase discriminator AD8302 at least range of linearity being in phase response characteristic curve under two states, length L of jumper line is calculated by below equation:The invention have benefit that: the phase detecting circuit of the present invention by adding the delay cable of length-specific to signal on any one road signal input channel in two paths of signals input channel, change phase contrast during two paths of signals integrated phase discriminator AD8302 of arrival, enable former phase contrast to skip the inelastic region of phase response characteristic curve, solve nonlinear area problem and two-value sex chromosome mosaicism.
Description
Technical field
The present invention relates to a kind of phase detecting circuit and method for self-calibrating thereof, be specifically related to a kind of based on integrated phase discriminator
The high-precision phase position testing circuit of AD8302 and method for self-calibrating thereof, belong to phase difference measurement technical field.
Background technology
In real work, it is often necessary to detect the phase contrast between two signals, this is also research network phase-frequency characteristic
In indispensable importance.In some field, the phase contrast accurately measured between two signals has critically important meaning
Justice, such as: the data in electrical instrument, synchronous detecting process and in Experiment of Electrical Engineering, it is often necessary to measure two row homogenous frequency signals
Phase contrast.But traditional phase tester exists a lot of defect, the frequency range such as its work is narrow, typically can only measure low frequency or in
Frequently signal, the precision of measurement is the highest.
Integrated phase discriminator AD8302 be U.S.'s ADI company calendar year 2001 release for RF/IF (radio frequency/
Intermediate frequency) amplitude and first monolithic die of phase measurement, mainly by a wideband phase inspection
Ripple device, two wide band logarithmic cymoscopes, bias unit, out amplifier group and output reference voltage (1.8V) buffering
The part composition such as device.
Utilize the phase Difference Measuring System that integrated phase discriminator AD8302 builds, two independent penetrating can be measured in degree of precision ground
Frequently (RF), the phase contrast of intermediate frequency (IF) signal, the frequency of measured signal can be up to 2.7GHz.
The equation that integrated phase discriminator AD8302 measures phase contrast is as follows:
Vphs=VΦ(Φ(V1)-Φ(V2)) formula (1)
In formula, V1And V2It is respectively two-way input signal amplitude (unit is millivolt), Φ (V1) and Φ (V2) it is respectively two-way
Input signal phase place (unit degree of being), VΦFor the phase response characteristic slope of curve (unit is millivolt/degree), VphsFor phase bit comparison
Output (unit is millivolt).
From formula (1), the output voltage of integrated phase discriminator AD8302 is divided by VΦCan be obtained by two input signals
Phase contrast.
The integrated preferable resonse characteristic of phase discriminator AD8302 is as shown in Figure 1.
But in a practical situation, when using integrated phase discriminator AD8302 to carry out phase difference measurement, actual phase response is special
Linearity curve is as in figure 2 it is shown, there are following problems in it:
(1) nonlinear area problem: phase place is near 0 ° ,+180 ° and-180 ° time, and phase response characteristic curve is deposited
Serious non-linear, as shown in Fig. 3 encircled, the transaxial width of inelastic region is about 40 °, if not to nonlinear area
Phase difference value make special handling, then the measurement error at this region phase value can be bigger.
(2) two-value sex chromosome mosaicism: the measurement scope of integrated phase discriminator AD8302 is 0 °～+180 ° and 0 °～-180 °, by integrated
Phase discriminator AD8302 preferable phase response characteristic curve is it is found that same magnitude of voltage correspond to two phase contrasts, just
It is one positive one negative, it is impossible to single differentiate that it is positive and negative from output voltage, so range expansion to 0 °～360 ° cannot will be measured.
(3) problem of inconsistency: phase discriminator AD8302 integrated to multi-disc tests, finds every a piece of integrated phase discriminator
Actual phase resonse characteristic all property of there are differences of AD8302, the slope showing as curve of output is different, if using same
Set coefficient will be unable to obtain relatively high measurement accuracy, it is therefore desirable to calibrates every suit measuring circuit, can obtain more accurate
True slope value.
Summary of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of height based on integrated phase discriminator AD8302
Accurate phase testing circuit and method for self-calibrating thereof, wherein, this phase detecting circuit can effectively solve the problem that phase response characteristic is bent
The nonlinear area problem of line and two-value sex chromosome mosaicism, it is possible in 0MHz～60MHz frequency range, accurately measure 0 °～360 ° of phases
Potential difference, its method for self-calibrating can effectively solve the problem that problem of inconsistency, greatly reduces the workload of actual measuring circuit debugging, from
And automatic measurement level can be improved.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that:
High-precision phase position testing circuit based on integrated phase discriminator AD8302, including: integrated phase discriminator AD8302, aforementioned collection
The input becoming phase discriminator AD8302 connects two paths of signals input channel, it is characterised in that the most any one road signal inputs
Being provided with two radio-frequency relays on passage, both of the aforesaid radio-frequency relay can carry out ledger line and not the cutting of ledger line two states
Change, under ledger line and not ledger line two states the output valve of integrated phase discriminator AD8302 at least one to be in phase response characteristic bent
The range of linearity of line, length L of jumper line is calculated by below equation:
In formula, v is signal spread speed in cable, and f is signal frequencies of propagation in cable, and △ φ is to add
The phase contrast that long cable introduces, the size of △ φ is by the inelastic region of the phase response characteristic curve of integrated phase discriminator AD8302
Transaxial width determine.
Aforesaid high-precision phase position testing circuit based on integrated phase discriminator AD8302, it is characterised in that aforementioned integrated mirror
The actual phase resonse characteristic of phase device AD8302 is:
In formula, U is the voltage of integrated phase discriminator AD8302 output,For the phase place that voltage U is corresponding, f is that signal is at cable
Frequencies of propagation in line, k1、k2It is undetermined coefficient with b, is determined by self calibration.
Aforesaid high-precision phase position testing circuit based on integrated phase discriminator AD8302, it is characterised in that method for self-calibrating
Comprise the following steps:
(1) two calibration cables are respectively connected to the 1st tunnel input signal port and the 2nd tunnel input signal port；
(2) other end giving calibrated cable accesses same-phase signal source, changes the frequency of input signal, then records number
According to (fi, Ui,), wherein, fiFor the frequency of signal source, UiThe voltage exported for integrated phase discriminator AD8302,Use for calibration
Cable is at fiPhase contrast under frequency；
(3) from the data of test record, the range of linearity, the left side being evenly distributed on phase response characteristic curve 6 is chosen
Group data, use least square fitting to calculate the k in formula (6)11、k21And b1, wherein, the expression formula of formula (6) is as follows:
(4) from the data of test record, the range of linearity, the right being evenly distributed on phase response characteristic curve 6 is chosen
Group data, use least square fitting to calculate the k in formula (7)12、k22And b2, wherein, the expression formula of formula (7) is as follows:
The invention have benefit that:
(1) phase detecting circuit:
By adding prolonging of length-specific to signal on any one road signal input channel in two paths of signals input channel
Cable late, changes phase contrast during two paths of signals integrated phase discriminator AD8302 of arrival, enables former phase contrast to skip phase place and rings
Should characteristic inelastic region, solve nonlinear area problem, and former phase contrast can be determined be in output characteristics
The left area of curve or right half area, thus it can be made to measure scope and be transformed into can be surveyed by 0 °～+180 ° and 0 °～-180 °
0 °～360 °, solve two-value sex chromosome mosaicism.
(2) method for self-calibrating:
Data acquisition and matched curve are all integrated in program, use method of least square to solve and obtain actual phase place
Resonse characteristic, not only makes certainty of measurement improve, and decreases workload, also reduce circuit design difficulty simultaneously.
Accompanying drawing explanation
Fig. 1 is preferable phase response characteristic curve chart；
Fig. 2 is actual phase response characteristic curve chart；
Fig. 3 is the phase detecting circuit figure of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention made concrete introduction.
One, phase detecting circuit
With reference to Fig. 3, the high-precision phase position testing circuit based on integrated phase discriminator AD8302 of the present invention includes: integrated phase demodulation
The input of device AD8302, this integrated phase discriminator AD8302 connects has two paths of signals input channel (to be designated as the 1st road signal respectively defeated
Enter passage, the 2nd road signal input channel), any one road signal input channel (the present embodiment in this two paths of signals input channel
In be the 1st road signal input channel) on two radio-frequency relays be installed (be designated as radio-frequency relay A and radio-frequency relay respectively
B), radio-frequency relay A and radio-frequency relay B can carry out the switching of ledger line and not ledger line two states, ledger line and not ledger line two
The output valve at least range of linearity being in phase response characteristic curve of integrated phase discriminator AD8302 under the state of kind.
According to physics knowledge, when signal is propagated in cable, its spread speed v and wavelength X and the relation of frequency f
For:
V=λ f formula (2)
The phase place that the length of jumper line introduces is changed to:
The computing formula of length L of jumper line can be obtained according to formula (2) and formula (3):
In formula (4), v is signal spread speed (unit is m/s) in cable, and f is signal biography in cable
Broadcasting frequency (unit is Hz), △ φ is the phase contrast (unit is degree) that jumper line introduces.
The size of △ φ is true by the transaxial width of the inelastic region of the phase response characteristic curve of integrated phase discriminator AD8302
Fixed, owing to the transaxial width of inelastic region is about 40 °, rule of thumb the span of △ φ be 40 °～120 ° more suitable, example
As taken △ φ=120 °, signal frequency f=30Mhz, v=3.0 × 108M/s, utilizes formula (4) can calculate to obtain L=3.3m.
We are by adding length-specific to signal on any one road signal input channel in two paths of signals input channel
Delay cable, change two paths of signals arrive integrated phase discriminator AD8302 time phase contrast, enable former phase contrast to skip phase
The inelastic region of position resonse characteristic, and former phase contrast can be determined be in the left area of output characteristic curve still
Right half area, thus it can be made to measure scope and be transformed into by 0 °～+180 ° and 0 °～-180 ° and can survey 0 °～360 °.
Specific as follows:
(1) for nonlinear area problem:
If phase place to be measured almost falls in the inelastic region of Fig. 2 lower-left, after increasing cable (a length of L), phase contrast
To increase, point will move up, and leaves inelastic region；
If phase place to be measured almost falls in the inelastic region on Fig. 2 top, after increasing cable (a length of L), point will
Move down or first move the most still further below, leave inelastic region；
If phase place to be measured almost falls in the inelastic region of Fig. 2 bottom right, after increasing cable (a length of L), phase contrast
To increase, point will first move down, and then jumps in the inelastic region of Fig. 2 lower-left, then moves up, and leaves inelastic region.
So, as long as length L of the cable increased is suitable, which inelastic region don't-care point falls in, can jump out
Inelastic region, records exact value.
(2) for two-value sex chromosome mosaicism:
After increasing cable, if phase place almost moves up, then point is just in 0 °～-180 ° of intervals, if phase place
Almost move down, then point is just in 0 °～+180 ° of intervals.
So, two-value sex chromosome mosaicism is just solved such that it is able to measure 0 °～360 ° of phase contrasts.
After increasing cable, if phase place almost falls in inelastic region, then deduct increase with the phase contrast recorded after ledger line
The phase contrast that cable is introduced, using this difference as the phase difference measurement between input signal；If phase place does not almost fall within
Inelastic region, then with the phase contrast before ledger line as the phase contrast measured value between input signal.
As can be seen here, the phase detecting circuit of the present invention, by ledger line and the switching of not ledger line two states, effectively solves
The nonlinear area problem of phase response characteristic curve and two-value sex chromosome mosaicism such that it is able in 0MHz～60MHz frequency range
Interior accurately 0 °～360 ° of phase contrasts of measurement.
Two, method for self-calibrating
Phase discriminator AD8302 integrated to multi-disc tests, and finds that the output characteristics of every a piece of integrated phase discriminator AD8302 is bent
Line all property of there are differences, show that the slope of output characteristic curve is different.This discordance shows, each integrated phase discriminator
The phase response characteristic curve of AD8302 is different, it is impossible to directly use theoretical phase response characteristic curve.According to
The method fit phase resonse characteristic that manual testing calculates, will expend substantial amounts of manpower and time.
Additionally, in phase Difference Measuring System, need each phase detecting circuit is carried out ledger line, and the cable increased
Per se with absolute error, this part absolute error is eventually transferred on the phase contrast that we are measured.
Therefore, we devise the method for self-calibrating of phase detecting circuit, data acquisition and matched curve are fully integrated
In program, method of least square is used to solve the phase response characteristic curve of reality so that phase can be calculated by being used at any time
The phase response characteristic curve of potential difference is adjusted to most preferably.
The main thought of the method for self-calibrating of the present invention is: change the phase contrast relation of two-way input signal, rings in phase place
12 groups of frequency input signals and corresponding integrated phase discriminator AD8302 output voltage data should be obtained in the characteristic range of linearity,
Method of least square is used to carry out the phase response characteristic curve that linear fit is actual to obtain integrated phase discriminator AD8302.
The method for self-calibrating of the present invention is described in detail below.
By analyzing, in Fig. 3, integrated phase discriminator AD8302 tests the phase difference output of circuit and includes following sections:
(1) theoretical value of two cable phase contrasts to be measured；
(2) Fig. 3 tests circuit and introduces the error relevant with frequency；
(3) error unrelated with pull-in frequency.
Therefore actual phase resonse characteristic can be expressed as:
In formula (5):
U is the voltage of integrated phase discriminator AD8302 output；
For the phase place that voltage U is corresponding；
k2F represents the error of multiple and frequency dependence measuring system import, specifically includes: the absolute error of delay line,
Two input signals transmission path on circuit boards differs the error of introducing；
B is the constant term unrelated with signal frequency.
k1、k2It is undetermined coefficient with b, can be determined by self calibration.
Learning from Fig. 2, phase response characteristic curve has two sections, left and right, so to there being two equations:
Formula (6) and formula (7) represent left section of phase response characteristic curve and right section of phase response characteristic curve respectively.U
It is known quantity with f, k11、k21、b1、k12、k22And b2For unknown quantity (can be calculated by least square fitting, be discussed below).
Step 1
By two calibration cables, (phase place of every is recorded by High-precision Vector Network Analyzer, it is believed that be true
Value) it is respectively connected to the 1st tunnel input signal port and the 2nd tunnel input signal port.
Step 2
Access same-phase signal source to the other end of calibrated cable, change the frequency of input signal, record data (fi,
Ui,), wherein, fiFor the frequency of signal source, UiThe voltage exported for integrated phase discriminator AD8302,Exist for calibrated cable
fiPhase contrast (being recorded by High-precision Vector Network Analyzer) under frequency.
Step 3
6 groups of numbers of the range of linearity, the left side being evenly distributed on phase response characteristic curve are chosen from the data of test record
According to, use least square fitting to calculate the k in formula (6)11、k21And b1。
Step 4
6 groups of numbers of the range of linearity, the right being evenly distributed on phase response characteristic curve are chosen from the data of test record
According to, use least square fitting to calculate the k in formula (7)12、k22And b2。
So, we have obtained the actual phase resonse characteristic expression formula of integrated phase discriminator AD8302.
The method for self-calibrating of the present invention has the advantage that
(1) certainty of measurement is high
Owing to using measurement data and the most comprehensive rational formula that phase response characteristic curve is fitted, examine simultaneously
All type of error that hardware system brings are considered, so that certainty of measurement improves.
(2) workload is few
Existing measuring method is very sensitive to the change of condition, and once input signal changes greatly, will do substantial amounts of experiment
Test, but utilize the method for self-calibrating of the present invention these work all to be simplified, automatization, and the workload of people subtracts significantly
Few, the effect of people is weakened, and service efficiency increases, and is greatly saved the time.
(3) circuit design difficulty reduces
When circuit design, the requirement to the cabling of two input signals reduces, it is not necessary to require that the circuit of two-way input signal is walked
Line is just the same.
Three, application
The phase detecting circuit based on integrated phase discriminator AD8302 of the present invention, its be successfully applied to frequency be 3MHz～
Phase difference measurement between 30MHz range signals, measurement scope is 0 °～360 °, and major part measuring result error is within 0.5 °.
To measure the phase contrast of more broadband signal, only need to carry out part change on hardware circuit, software section is several
Can multiplexing completely.
To measure the phase contrast between many radiofrequency signals, it is only necessary to hardware module is replicated.
In sum, the phase detecting circuit based on integrated phase discriminator AD8302 of the present invention, its favorable expandability, multiplexing is imitated
Rate is high, and certainty of measurement is high, and method for self-calibrating is reliable and practical.
Become it should be noted that above-described embodiment limits the present invention, all employing equivalents or equivalence the most in any form
The technical scheme that the mode changed is obtained, all falls within protection scope of the present invention.
Claims (3)
1. high-precision phase position testing circuit based on integrated phase discriminator AD8302, including: integrated phase discriminator AD8302, described integrated
The input of phase discriminator AD8302 connects two paths of signals input channel, it is characterised in that signal input in the most any one road is logical
Being provided with two radio-frequency relays on road, said two radio-frequency relay can carry out ledger line and not the cutting of ledger line two states
Change, under ledger line and not ledger line two states the output valve of integrated phase discriminator AD8302 at least one to be in phase response characteristic bent
The range of linearity of line, length L of jumper line is calculated by below equation:
In formula, v is signal spread speed in cable, and f is signal frequencies of propagation in cable, and Δ φ is to lengthen electricity
The phase contrast that cable introduces, the size of Δ φ is by the horizontal stroke of the inelastic region of the phase response characteristic curve of integrated phase discriminator AD8302
Axial extent determines.
High-precision phase position testing circuit based on integrated phase discriminator AD8302 the most according to claim 1, it is characterised in that
The actual phase resonse characteristic of described integrated phase discriminator AD8302 is:
In formula, U is the voltage of integrated phase discriminator AD8302 output,For the phase place that voltage U is corresponding, f is that signal is in cable
Frequencies of propagation, k1、k2It is undetermined coefficient with b, is determined by self calibration.
High-precision phase position testing circuit based on integrated phase discriminator AD8302 the most according to claim 1 and 2, its feature exists
In, method for self-calibrating comprises the following steps:
(1) two calibration cables are respectively connected to the 1st tunnel input signal port and the 2nd tunnel input signal port；
(2) other end giving calibrated cable accesses same-phase signal source, changes the frequency of input signal, then records data
(fi, Ui,), wherein, fiFor the frequency of signal source, UiThe voltage exported for integrated phase discriminator AD8302,For calibration electricity consumption
Cable is at fiPhase contrast under frequency；
(3) from the data of test record, choose 6 groups of numbers of the range of linearity, the left side being evenly distributed on phase response characteristic curve
According to, use least square fitting to calculate the k in formula (6)11、k21And b1, wherein, the expression formula of formula (6) is as follows:
(4) from the data of test record, choose 6 groups of numbers of the range of linearity, the right being evenly distributed on phase response characteristic curve
According to, use least square fitting to calculate the k in formula (7)12、k22And b2, wherein, the expression formula of formula (7) is as follows:
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| CN108151641A (en) * | 2017-12-14 | 2018-06-12 | 北京无线电计量测试研究所 | The length measurement method and equipment of a kind of radio-frequency transmission line |
| CN109799247A (en) * | 2019-02-15 | 2019-05-24 | 河北大学 | Two phase flow measuring of phase ratio device and method based on the microwave transmission time |
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| CN111693580A (en) * | 2020-05-15 | 2020-09-22 | 江苏大学 | Capacitive soil moisture monitoring system and method |
| CN113288080A (en) * | 2021-04-28 | 2021-08-24 | 郑州大学 | Non-contact vital sign detection system based on phase comparison |
| CN113295918A (en) * | 2021-05-10 | 2021-08-24 | 中国科学院合肥物质科学研究院 | Diagnostic system for measuring current intensity and phase difference of antenna current strip |
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