CN106353562A - Method for measuring weak nonlinear current-voltage characteristic by alternating current excitation - Google Patents
Method for measuring weak nonlinear current-voltage characteristic by alternating current excitation Download PDFInfo
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- CN106353562A CN106353562A CN201610850495.6A CN201610850495A CN106353562A CN 106353562 A CN106353562 A CN 106353562A CN 201610850495 A CN201610850495 A CN 201610850495A CN 106353562 A CN106353562 A CN 106353562A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a method for measuring weak nonlinear current-voltage characteristic by alternating current excitation. The method comprises the following steps of according to a measuring circuit diagram, connecting a signal source, a to-be-measured part, a harmonic analyzer and a sampling resistor; setting alternating current sine excitation voltage signal frequency; adjusting the vibration amplitude of an excitation voltage signal, and measuring the vibration amplitude of a harmonic signal of each order; according to the measuring data, calculating the coefficients of the current-voltage relationship of the to-be-measured part; according to the obtained coefficients, calculating the nonlinear current-voltage relationship of the to-be-measured part. The method has the advantages that by adopting the alternating current voltage signal to excite the to-be-measured part, the separation of strong linear items and weak nonlinear items in a frequency space is realized, so that the nonlinear current-voltage characteristic with one to three orders of magnitude lower than the linear background is obtained; the problem of poorer universality in traditional direct current type and testing equipment is solved.
Description
Technical field
The present invention relates to a kind of method using the faint nonlinear current-voltage of ac-excited measurement, especially suitable
In in strong background, faint non-linear current-voltage is tested, belong to ultra-weak electronic signal technical field of measurement and test.
Background technology
The current-voltage relation of device is a crucial electric property and index.The conduction type of device and mechanism are led to
Often all judged by current-voltage relation, and what current-voltage relation was mainly obtained with DC equipment measurement.Right
Conventional this kind of device of adapter in microwave regime, when testing its current-voltage relation with direct current mode and equipment, result
It is shown to be linear, i.e. ohm-type.And when the HIGH-POWERED MICROWAVES signal having more than two-way or two-way passes through such devices, meeting
Faint inter-modulated signal is had to produce, this shows that this kind of device has faint nonlinear conduction behavior.Non- with faint in order to study
The Physical Mechanism that linear conductance behavior is associated, needs faint non-linear current-voltage relation in strong Linear Background is carried out
Measurement.
It is limited to direct current mode and the limitation of test equipment itself, current DC equipment cannot measure linearly to be carried on the back by force
Faint nonlinear current-voltage in scape.
Content of the invention
The technology solve problem of the present invention is: overcomes the deficiencies in the prior art, the invention provides a kind of swashed using exchange
Encourage the method measuring faint nonlinear current-voltage, by part to be measured is encouraged it is achieved that strong using ac voltage signal
Linear term and the faint non-linear separation in frequency space, thus obtain the non-linear electricity of low 1～3 order of magnitude than Linear Background
Stream-voltage characteristic；Solve the problems, such as that traditional direct current mode and test equipment versatility are poor.
The technical solution of the present invention is:
A kind of method using the faint nonlinear current-voltage of ac-excited measurement, comprises the steps:
Step one: be connected in series signal source, part to be measured and sampling resistor and constitute energized circuit, be connected in parallel stress_responsive genes instrument
Constitute harmonic measure loop with part to be measured；
Step 2: setting signal source output signal is sinusoidal signal, and sets sinusoidal signal frequency；
Step 3: change the amplitude u of signal source output signal0, each amplitude u is measured by stress_responsive genes instrument0Corresponding
The amplitude u of nth harmonic signaln, n is positive integer；
Step 4: the test data according to stress_responsive genes instrument calculates each term coefficient g in part current-voltage relation to be measuredn,Wherein, r is the resistance of sampling resistor, and u is the active voltage at part two ends to be measured, u=u0-(r+rs)u1/ r, rs
For singal source resistance；
Step 5: according to described each term coefficient gnCalculate part current-voltage relation to be measured, linear current-voltage relation
For i=g1v；Nonlinear current-voltage relation is i=g2v2+g3v3+…+gnvn, wherein, i is electric current, and v is voltage.
In a kind of above-mentioned method using the faint nonlinear current-voltage of ac-excited measurement, described signal
, as both positive and negative polarity, the mode according to DC circuit connects for the inner core of the external bnc interface of source harmonic tester and outer conductor.
The frequency of the sinusoidal signal of described signal source output is less than 50khz, and does not take the integral multiple of 25hz and 50hz.
In described step 3, the harmonic wave highest order n of part to be measured is determined by the test limits of stress_responsive genes instrument and noise level
Fixed, that is, when the test limits of n order harmonic signal and stress_responsive genes instrument or noise level are identical, described n order harmonic signal
For highest rd harmonic signal.
Compared with the prior art, the invention has the advantages that:
1st, the present invention pass through using ac voltage signal encourage part to be measured it is achieved that strong linear term and faint non-linear
The separation of frequency space, thus obtain the nonlinear current-voltage of low 1～3 order of magnitude than Linear Background；Solve biography
The direct current mode of system and the poor problem of test equipment versatility.
2nd, the present invention adopts low-frequency excitation signal, can continue to use the voltage divider principle in DC test mode, simple and practical, just
Enforcement in those skilled in the art.
3rd, logic smoothness of the present invention, clear thinking, reasonable in design, those skilled in the art are carried out according to the step of the present invention
Experiment, can fast and accurately measure faint non-linear current-voltage relation in strong Linear Background.
4th, the present invention can be adjusted flexibly according to practical situation, and test process is safe and reliable, and optimizes working place, subtracts
The light operating burden of staff.
5th, the signal source of the present invention, stress_responsive genes instrument and sampling resistor are conventional hardware, easy accessibility, need not be special,
And be easy to keep in repair and change, significantly reduce production cost.
6th, the present invention is applied to various working environments, still can be to the non-linear conduction of each device under complex working condition
Behavior measures, workable.
Brief description
Fig. 1 is the flow chart of the present invention
Fig. 2 is the circuit diagram of the present invention
Fig. 3 is the stress_responsive genes result figure of the embodiment of the present invention
Fig. 4 is the current-voltage relation comparison diagram of the linear processes part of the embodiment of the present invention
Wherein: 1 signal source；2 parts to be measured；3 stress_responsive genes instrument；4 sampling resistors；
Specific embodiment
The invention will be further described with specific embodiment for explanation below in conjunction with the accompanying drawings:
As shown in Fig. 1～2, a kind of method using the faint nonlinear current-voltage of ac-excited measurement, including such as
Lower step:
Step one: be connected in series signal source 1, part to be measured 2 and sampling resistor 4 and constitute energized circuit, be connected in parallel harmonic wave and survey
Examination instrument 3 and part to be measured 2 constitute harmonic measure loop；
Step 2: setting signal source 1 output signal is sinusoidal signal, and sets sinusoidal signal frequency；
Step 3: change the amplitude u of signal source 1 output signal0, each amplitude u is measured by stress_responsive genes instrument 30Corresponding
The amplitude u of n-th harmonic signaln, n is positive integer；
Step 4: the test data according to stress_responsive genes instrument 3 calculates each term coefficient in part 2 current-voltage relation to be measured
gn,Wherein, r is the resistance of sampling resistor 4, and u is the active voltage at part 2 two ends to be measured, u=u0-(r+rs)u1/
R, rsFor singal source resistance；
Step 5: according to described each term coefficient gnCalculate part 2 current-voltage relation to be measured, linear current-voltage relation
For i=g1v；Nonlinear current-voltage relation is i=g2v2+g3v3+…+gnvn, wherein, i is electric current, and v is voltage.
The inner core of the external bnc interface of described signal source 1 harmonic tester 3 and outer conductor as both positive and negative polarity, according to direct current
The mode of circuit connects.
The frequency of the sinusoidal signal of described signal source 1 output is less than 50khz, and does not take the integral multiple of 25hz and 50hz.
In described step 3, the harmonic wave highest order n of part 2 to be measured is by the test limits of stress_responsive genes instrument 3 and noise level
Determine, that is, when the test limits of n order harmonic signal and stress_responsive genes instrument 3 or noise level are identical, described n order harmonic is believed
Number be highest rd harmonic signal.
As shown in figure 3, the present embodiment is formed by one diode of a 1k ω resistor coupled in parallel；Stanford is selected during test
The sr830 type lock-in amplifier of company, this instrument is provided that sinusoidal signal exports, and output impedance is 50 ω, and can test harmonic wave,
The resistance of sampling resistor 4 is 50 ω；The frequency setting of sinusoidal excitation signal is 878hz, and the excursion of amplitude is 0.01-
0.16v；According to order, order from low to high measures harmonic wave successively.
When test is to 9 subharmonic, harmonic signal is all concussion in entirely interval, suitable with noise level, therefore
Highest only measures the 9th subharmonic, and not adopts when the measurement result of the 9th subharmonic calculates.
According to each term coefficient g in stress_responsive genes result calculating current-voltage relationshipn,unFor measurement
The n-th harmonic signal amplitude arriving, u is the active voltage at part 2 two ends to be measured, according to voltage divider principle, u=u0-(50+rs)u1/ r,
u0For the amplitude of pumping signal, u1It is the amplitude of fundamental wave for first harmonic, rs=50 ω；According to test result calculations current-voltage
The meansigma methodss of each term coefficient in relational expression are shown in Table 1:
Table 1
As shown in figure 4, according to the coefficient g obtainingnThe current-voltage relation of calculated part to be measured 2, wherein linear
Current-voltage relation is by i=g1V calculates and obtains；Nonlinear current-voltage relation is by i=g2v2+g3v3+g4v4+g5v5+g6v6+
g7v7+g8v8Calculate and obtain, the present invention is obtained in that the nonlinear current-voltage of low 3 orders of magnitude than linear segment.
The operation principle of the present invention is:
The ac voltage signal that part 2 to be measured sends to signal source 1 produces response, and this response was both linear, had non-again
Linear；Nonlinear response is showed by harmonic wave form, and harmonic current produces voltage signal, this electricity on sampling resistor 4
The amplitude of pressure signal can be measured by stress_responsive genes instrument 3, and the signal source 1 that the present invention selects is low frequency signal source (＜
100khz), the output port of this kind of signal source is bnc interface, and the connectivity port of stress_responsive genes instrument 3 is also bnc interface, due to letter
Number frequency very low, the wavelength of voltage signal is far longer than the length of circuit loop, and the interior core conductor of bnc interface and outer core are led
Body is as the both positive and negative polarity of DC source, you can the mode according to DC circuit is attached, beneficial to measurement.
The content not described in detail in description of the invention is known to the skilled person technology.
Claims (4)
1. a kind of using the ac-excited method measuring faint nonlinear current-voltage it is characterised in that: include following walking
Rapid:
Step one: be connected in series signal source (1), part to be measured (2) and sampling resistor (4) and constitute energized circuit, be connected in parallel harmonic wave
Tester (3) and part to be measured (2) constitute harmonic measure loop；
Step 2: setting signal source (1) output signal is sinusoidal signal, and sets sinusoidal signal frequency；
Step 3: change the amplitude u of signal source (1) output signal0, each amplitude u is measured by stress_responsive genes instrument (3)0Corresponding
The amplitude u of n-th harmonic signaln, n is positive integer；
Step 4: the test data according to stress_responsive genes instrument (3) calculates each term coefficient in part to be measured (2) current-voltage relation
gn,Wherein, r is the resistance of sampling resistor (4), and u is the active voltage at part to be measured (2) two ends, u=u0-(r+
rs)u1/ r, rsFor singal source resistance；
Step 5: according to described each term coefficient gnCalculate part to be measured (2) current-voltage relation, linear current-voltage relation is i
=g1v；Nonlinear current-voltage relation is i=g2v2+g3v3+…+gnvn, wherein, i is electric current, and v is voltage.
2. a kind of method using the faint nonlinear current-voltage of ac-excited measurement according to claim 1, its
Be characterised by: described signal source (1) harmonic tester (3) externally the inner core of bnc interface and outer conductor as both positive and negative polarity, according to
The mode of DC circuit connects.
3. a kind of side using the faint nonlinear current-voltage of ac-excited measurement according to claim 1 and 2
Method it is characterised in that: the frequency of the sinusoidal signal that described signal source (1) exports is less than 50khz, and does not take that 25hz's and 50hz is whole
Several times.
4. a kind of method using the faint nonlinear current-voltage of ac-excited measurement according to claim 3, its
It is characterised by: in described step 3, the harmonic wave highest order n of part (2) to be measured is by the test limits of stress_responsive genes instrument (3) and noise
Level determines, that is, when the test limits of n order harmonic signal and stress_responsive genes instrument (3) or noise level are identical, described n order
Harmonic signal is highest rd harmonic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610850495.6A CN106353562A (en) | 2016-09-26 | 2016-09-26 | Method for measuring weak nonlinear current-voltage characteristic by alternating current excitation |
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| CN201610850495.6A CN106353562A (en) | 2016-09-26 | 2016-09-26 | Method for measuring weak nonlinear current-voltage characteristic by alternating current excitation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786587A (en) * | 2017-02-14 | 2017-05-31 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
-
2016
- 2016-09-26 CN CN201610850495.6A patent/CN106353562A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 何鋆 等: "一种采用交流激励的微弱非线性电流－电压关系测试方法", 《西安交通大学学报》 * |
| 冯占岭: "《数字电表检测技术》", 30 December 1996 * |
| 唐鸿宾: "《现代模拟电路实验》", 31 January 2009, 南京大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786587A (en) * | 2017-02-14 | 2017-05-31 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
| CN106786587B (en) * | 2017-02-14 | 2019-05-03 | 上海华虹宏力半导体制造有限公司 | The method for reducing resistance element network harmonic |
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