CN109142871A - A kind of linear stabilized power supply AC output impedance test circuit and method - Google Patents
A kind of linear stabilized power supply AC output impedance test circuit and method Download PDFInfo
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- CN109142871A CN109142871A CN201811237171.0A CN201811237171A CN109142871A CN 109142871 A CN109142871 A CN 109142871A CN 201811237171 A CN201811237171 A CN 201811237171A CN 109142871 A CN109142871 A CN 109142871A
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- power supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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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
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- Engineering & Computer Science (AREA)
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- Testing Of Individual Semiconductor Devices (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a kind of linear stabilized power supply AC output impedance test circuit and method, load capacitance CLBetween one termination measured device output end vo ut and resistance unit, other end ground connection；Resistance unit is connected in parallel on load capacitance CLBoth ends, resistance unit are composed in series by resistance R1 and resistance R2, resistance R1 connection output end vo ut, resistance R2 ground connection；VDMOS power crystal tube grid connecting signal source, source electrode are grounded, between the connecting resistance R1 and resistance R2 that drains；Measured device inlet circuit VINConnect power supply, the end GND ground connection；Oscillograph first passage is connected to measured device output end vo ut and load capacitance CLBetween；Second channel is connected to load capacitance C by current probeLBetween one end and resistance；Third channel is connected between signal source and VDMOS power crystal tube grid.Test macro development cost and period are reduced, the high-precision control and matching of test signal link are not depended on.
Description
Technical field
The invention belongs to integrated circuit testing field, be related to a kind of linear stabilized power supply AC output impedance test circuit and
Method.
Background technique
Linear stabilized power supply is a kind of widely used universal circuit, and the techniques such as CMOS, BiCMOS, bipolar can be used
Realize the functions such as different nominal value outputs, different response speeds.Linear stabilized power supply has the advantages that following prominent: can satisfy
Precision analog circuits, the requirement of radio circuit and other telecommunication circuits to the low output noise of power supply；The typical transient state of Microsecond grade is rung
Between seasonable, meet current extensive and high working frequency integrated circuit and power supply high speed input voltage variation response and load are become
Change the requirement of response；Low speed paper tape reader static power disspation can be improved the stand-by time of electronic system；Without electromagnetic component, area is small, is conducive to
Reduce volume and the cost etc. of electronic system；Therefore linear stabilized power supply has become the indispensable important composition portion of power-supply system
Point.When carrying out power-supply management system design using linear stabilized power supply, designer is increasingly paid close attention to involved in linear stabilized power supply
AC output impedance.Present GB/T 4377-1996 semiconductor integrated circuit voltage adjuster test method basic principle is contained
The test item and test method of lid can only meet the test request of linear stabilized power supply conventional parameter, be unable to complete linear voltage stabilization electricity
The test request of source AC output impedance.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of linear stabilized power supply exchange output resistance is provided
Anti- test circuit and method not only can guarantee that AC output impedance was tested, but also can accurately obtain on the basis of not increasing new equipment
Test data of interest.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of linear stabilized power supply AC output impedance test circuit, including power supply, signal source, load capacitance CL, resistance
Unit, oscillograph and VDMOS power transistor；
The load capacitance CLBetween one end Jie measured device output end vo ut and resistance unit, other end ground connection；Electricity
Resistance unit is connected in parallel on load capacitance CLBoth ends, resistance unit are composed in series by resistance R1 and resistance R2, resistance R1 connection output end
Vout, resistance R2 ground connection；VDMOS power crystal tube grid connecting signal source, source electrode ground connection, drain electrode connect in resistance R1 and resistance R2
Between；
The measured device inlet circuit VINConnect power supply, the end GND ground connection；
The oscillograph first passage is connected to measured device output end vo ut and load capacitance CLBetween, for monitoring quilt
Survey device output voltage peak-to-peak value △ vout；Second channel is connected to load capacitance C by current probeLBetween one end and resistance,
For monitoring measured device output current peak value △ iout；Third channel is connected to signal source and VDMOS power crystal tube grid
Between, signal peak and frequency for monitoring signals source.
Preferably, power supply is 2.8V DC power supply.
Preferably, signal source output signal frequency is 10Hz~10MHz.
Preferably, VDMOS power transistor uses LCS7469U2RH power transistor.
Preferably, linear stabilized power supply output voltage and current signal are sinusoidal signal.
A kind of linear stabilized power supply AC output impedance test method is based on foregoing circuit, includes the following steps；
Step 1, signal source output signal frequency is incremented by successively, is exported by oscillograph recording measured device output end vo ut
AC signal voltage peak-to-peak value △ voutWith current peak value △ iout；
Step 2, by formulaIt finds out and is tested at each Frequency point of VDMOS power transistor grid control signal
Resistance AC output impedance R (f).
Preferably, the increment that signal source output signal frequency is incremented by every time successively increases.
Preferably, in step 1, the output signal frequency range of signal source is 10Hz~10MHz.
Compared with prior art, the invention has the following advantages:
The present invention can on the basis of not increasing new equipment using the system of universal standardization test equipment composition
Guarantee AC output impedance test, and can accurately obtain test data of interest, compared to linear stabilized power supply conventional parameter
Index testing system, which high degree reduce test macro development cost and period, do not depend on test signal link
High-precision control and matching, promoted linear stabilized power supply high speed correlative technology field application and development, for the series
Circuit preferably serves modern high-new electronic industry development and carries out support.
The method of the invention controls VDMOS power transistor grid by certain frequency sine AC signal that signal source exports
Voltage changes the output loading size of linear stabilized power supply, tracks the variation of output end alternating voltage, alternating current, finds out
Linear stabilized power supply AC output impedance at each Frequency point of VDMOS power transistor gate control signal, the test method extract ginseng
Number mode is simple, intuitive, low to the integrity demands of test equipment precision and signal link, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the schematic diagram of test circuit of the invention；
Fig. 2 is the curve relation figure of measured device AC output impedance and frequency of the invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
As shown in Figure 1, test system structure is by power supply, signal source, oscillograph, oscilloscope current probe, load capacitance CL、
VDMOS power transistor, resistance unit, AC output impedance test board composition.Its electric connecting relation is as follows: load capacitance CL
Between one end Jie measured device output end vo ut and resistance unit, other end ground connection, load capacitance CLFor linear stabilized power supply
Output capacitance, the output load capacitance specification of different linear voltage regulators is different；Resistance unit is connected in parallel on load capacitance CLBoth ends,
Resistance unit is composed in series by resistance R1 and resistance R2, and two resistance define the test exchange output resistance under much output electric currents
It is anti-；VDMOS power crystal tube grid connecting signal source, source electrode ground connection, drain electrode connect between resistance R1 and resistance R2, VDMOS function
Rate transistor converts the ac voltage signal of signal source to the output alternating current of circuit.
The measured device input terminal VINTermination power, the end GND ground connection.
The first passage of the oscillograph is connected to measured device output end vo ut and load capacitance CLBetween, for monitoring
Measured device output voltage peak-to-peak value △ vout；Second channel is connected to load capacitance C by current probeLOne end and resistance it
Between, for monitoring measured device output current peak value △ iout；Third channel is connected to signal source and VDMOS power transistor
Signal peak and frequency between grid, for monitoring signals source.
The test macro of the invention can be applicable to the AC output impedance test of linear stabilized power supply, signal source output signal
Frequency range is that 10Hz~10MHz can be through the invention when the test equipment power of test meets linear stabilized power supply requirement
Complete AC output impedance test.When test macro works normally, observation oscilloscope, adjustment signal source output signal peak peak
Value, it is ensured that signal source output signal in 10Hz~10MHz frequency range, linear stabilized power supply output signal Vout be it is approximate just
String signal；For signal source output signal since 10Hz, step-length is a certain value, until 10MHz, record linear stabilized power supply output is handed over
Flow signal voltage peak-to-peak value △ voutWith current peak value △ iout, determining output end load capacitance value CLUnder the conditions of, by formulaFind out linear stabilized power supply AC output impedance R at each Frequency point of VDMOS power transistor gate control signal
(f)。
Embodiment 1
Carry out the test of linear stabilized power supply AC output impedance based on above-mentioned test method.Wherein linear voltage stabilization electricity to be measured
Source uses LW5275-1.8 linear stabilized power supply, this is a kind of super β type low pressure difference linearity regulated power supply of Flouride-resistani acid phesphatase 7.5A, VDMOS
Power transistor uses LCS7469U2RH power transistor.First by the input terminal V of LW5275-1.8INPort and the port GND point
Not Jie Ru 2.8V DC power supply and ground, set output end load capacitance value CL=47 μ F, and setting signal source output signal ensures
In 10Hz~10MHz, linear stabilized power supply output voltage, current signal are sinusoidal signal, and connect the grid of VDMOS power tube
A point.For signal source output signal frequency since 10Hz, step-length is a certain value, until 10MHz, linearly steady by oscillograph recording
Voltage source Vout point exports AC signal voltage peak-to-peak value △ voutWith current peak value △ iout, by formulaIt asks
Linear stabilized power supply AC output impedance R (f) at each Frequency point of VDMOS power transistor grid control signal out, data such as table 1
Shown, using Frequency point as X-axis, AC output impedance is Y-axis, draws VDMOS power crystal tube grid using related software and controls
The curve of signal frequency and AC output impedance, as shown in Fig. 2, the curve of linear voltage regulator AC output impedance and frequency can be obtained
Relationship.
1 linear stabilized power supply AC output impedance test data of table
| Frequency (Hz) | 10 | 20 | 50 | 100 | 200 | 500 | 1k | 2k | 5k | 10k | 20k | 50k | 100k | 200k | 500k | 1M |
| Vout(mV) | 0.496 | 0.5 | 0.485 | 0.516 | 0.532 | 0.63 | 0.858 | 1.23 | 2.22 | 3.04 | 3.85 | 6.24 | 13.4 | 45.6 | 378 | 356 |
| iout(mA) | 31.7 | 31.5 | 31.7 | 32.5 | 32.2 | 32.9 | 33.0 | 33.0 | 33.2 | 33.8 | 34.1 | 34.3 | 34.3 | 34.5 | 38.6 | 35.8 |
| Ro(Ω) | 0.016 | 0.016 | 0.015 | 0.016 | 0.017 | 0.019 | 0.026 | 0.037 | 0.067 | 0.090 | 0.113 | 0.182 | 0.391 | 1.322 | 9.793 | 9.944 |
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (8)
1. a kind of linear stabilized power supply AC output impedance tests circuit, which is characterized in that including power supply, signal source, load electricity
Hold CL, resistance unit, oscillograph and VDMOS power transistor；
The load capacitance CLBetween one end Jie measured device output end vo ut and resistance unit, other end ground connection；Resistance unit
It is connected in parallel on load capacitance CLBoth ends, resistance unit are composed in series by resistance R1 and resistance R2, resistance R1 connection output end vo ut, electricity
Hinder R2 ground connection；VDMOS power crystal tube grid connecting signal source, source electrode ground connection, drain electrode connect between resistance R1 and resistance R2；
The measured device inlet circuit VINConnect power supply, the end GND ground connection；
The oscillograph first passage is connected to measured device output end vo ut and load capacitance CLBetween, for monitoring tested device
Part output voltage peak-to-peak value △ vout；Second channel is connected to load capacitance C by current probeLBetween one end and resistance, it is used for
It monitors measured device and exports current peak value △ iout；Third channel be connected to signal source and VDMOS power crystal tube grid it
Between, signal peak and frequency for monitoring signals source.
2. a kind of linear stabilized power supply AC output impedance according to claim 1 tests circuit, which is characterized in that power supply
For 2.8V DC power supply.
3. a kind of linear stabilized power supply AC output impedance according to claim 1 tests circuit, which is characterized in that signal
Source output signal frequency is 10Hz~10MHz.
4. a kind of linear stabilized power supply AC output impedance according to claim 1 tests circuit, which is characterized in that
VDMOS power transistor uses LCS7469U2RH power transistor.
5. a kind of linear stabilized power supply AC output impedance according to claim 1 tests circuit, which is characterized in that linear
Regulated power supply output voltage and current signal are sinusoidal signal.
6. a kind of linear stabilized power supply AC output impedance test method, is based on circuit described in claim 1, feature exists
In including the following steps；
Step 1, signal source output signal frequency is incremented by successively, is exported and is exchanged by oscillograph recording measured device output end vo ut
Signal voltage peak-to-peak value △ voutWith current peak value △ iout；
Step 2, by formulaFind out measured resistance at each Frequency point of VDMOS power transistor grid control signal
AC output impedance R (f).
7. a kind of linear stabilized power supply AC output impedance test method according to claim 6, which is characterized in that signal
The increment that source output signal frequency is incremented by every time successively increases.
8. a kind of linear stabilized power supply AC output impedance test method according to claim 6, which is characterized in that step
In 1, the output signal frequency range of signal source is 10Hz~10MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237171.0A CN109142871B (en) | 2018-10-23 | 2018-10-23 | Linear voltage-stabilized power supply alternating current output impedance test circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811237171.0A CN109142871B (en) | 2018-10-23 | 2018-10-23 | Linear voltage-stabilized power supply alternating current output impedance test circuit and method |
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| Publication Number | Publication Date |
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| CN109142871A true CN109142871A (en) | 2019-01-04 |
| CN109142871B CN109142871B (en) | 2021-11-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567840A (en) * | 2021-09-08 | 2021-10-29 | 无锡力芯微电子股份有限公司 | High-precision detection method and circuit for dynamic response of power supply |
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| CN101858940A (en) * | 2009-04-07 | 2010-10-13 | 中茂电子(深圳)有限公司 | Output impedance measuring method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567840A (en) * | 2021-09-08 | 2021-10-29 | 无锡力芯微电子股份有限公司 | High-precision detection method and circuit for dynamic response of power supply |
| CN113567840B (en) * | 2021-09-08 | 2022-07-29 | 无锡力芯微电子股份有限公司 | High-precision detection method and circuit for dynamic response of power supply |
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| CN109142871B (en) | 2021-11-30 |
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