CN104280679B - High speed operation amplifier test circuit based on FLEX - Google Patents
High speed operation amplifier test circuit based on FLEX Download PDFInfo
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- CN104280679B CN104280679B CN201310293454.8A CN201310293454A CN104280679B CN 104280679 B CN104280679 B CN 104280679B CN 201310293454 A CN201310293454 A CN 201310293454A CN 104280679 B CN104280679 B CN 104280679B
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- high speed
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Abstract
The high speed operation amplifier test circuit based on FLEX of the present invention, the relay branch in parallel between the reverse input end and the amplifier ring reverse input end of test system MicroFLEX of high speed operation amplifier；The noninverting input of high speed operation amplifier is connect by relay branch with the amplifier ring noninverting input of test system, vision signal output end in the same direction, intermediate-freuqncy signal output end in the same direction respectively, and the shielded layer of amplifier ring reverse input end and noninverting input may be selected to be connected to the ground by relay；It is grounded after the noninverting input series relay branch of high speed operation amplifier；Multiple relay branches in parallel between the reverse input end of high speed operation amplifier and the output end of high speed operation amplifier；Multiple load branch in parallel between the output end of high speed operation amplifier and ground；The output end of high speed operation amplifier is connect by relay branch with the intermediate-freuqncy signal measurement end in the same direction of test system, vision signal measurement end in the same direction, amplifier ring output end respectively.
Description
Technical field
The present invention relates to ic test technique more particularly to a kind of high speeds based on FLEX（160Mhz or more）Operation
Amplifier test circuit.
Background technology
AD8041 is low feedback voltage, high speed operation amplifier, is widely used in space flight model.AD8041 is electrical
Energy conventional test methodologies speed is slow, precision is not high, to improve the speed and precision of AD8041 electric performance test methods, active demand
Find new test method.
LSI testing system Micro FLEX have high speed, high-precision test function, and have had
Kind window editing interface, appropriately designs relevant test circuits, can put Micro FLEX for the such high-speed computations of AD8041
The test of big device.
Invention content
The high speed operation amplifier test circuit based on FLEX that the purpose of the present invention is to provide a kind of, test speed is fast,
And measuring accuracy is high.
To achieve the goals above, the present invention provides a kind of high speed operation amplifier test circuit based on FLEX, uses
The electrical property of test system Micro FLEX test high speed operation amplifiers；In the reverse input end of high speed operation amplifier to be measured
At least two relays branch in parallel between an amplifier ring reverse input end of test system Micro FLEX, the amplifier ring are anti-
It may be selected to be connected to the ground by relay to the shielded layer of input terminal；The noninverting input of high speed operation amplifier to be measured is led to respectively
Cross relay branch and the corresponding amplifier ring noninverting inputs of test system Micro FLEX, vision signal output end in the same direction, in
The output end connection in the same direction of frequency signal, the shielded layer of the phase amplifier ring noninverting input may be selected to be connected to the ground by relay；It waits for
The noninverting input for surveying high speed operation amplifier is also connected and is grounded after a relay branch；High speed operation amplifier to be measured it is reversed
Multiple relay branches in parallel between input terminal and the output end of high speed operation amplifier to be measured；High speed operation amplifier to be measured
Multiple load branch in parallel between output end and ground, the load branch are the series circuit of relay and resistance；High speed to be measured
The output end of operational amplifier respectively by the intermediate-freuqncy signal measurement end in the same direction of relay branch and test system Micro FLEX,
Vision signal measurement end in the same direction, the connection of amplifier ring output end；The relay branch is relay or relay and resistance
Series circuit.
Wherein, two filter capacitors at least in parallel in parallel between the positive power source terminal of high speed operation amplifier to be measured and ground.
Wherein, two filter capacitors at least in parallel in parallel between the negative power end of high speed operation amplifier to be measured and ground.
Wherein, high speed operation amplifier to be measured is AD8041.
Compared with prior art, the solution have the advantages that：Solves conventional operational amplifiers test circuit test speed
The disadvantage that degree is slow, precision is low, has fully considered when carrying out high speed test, the shadow of the switching rate of relay to test result
It rings, using suitable relay and test circuit, ensure that the speed and precision of test, realize stable high speed test work(
Energy.
Description of the drawings
Fig. 1 is the high speed operation amplifier test circuit figure based on FLEX of present pre-ferred embodiments.
Specific implementation mode
Electricity is tested to the high speed operation amplifier proposed by the present invention based on FLEX below in conjunction with the drawings and specific embodiments
Road is described in further detail.
Present pre-ferred embodiments are for testing AD8041 electrical properties, the high speed based on FLEX that the present invention will be described in detail
Operational amplifier test circuit：
Fig. 1 show the high speed operation amplifier test circuit figure based on FLEX of present pre-ferred embodiments, relay
The shielded layer of an amplifier ring reverse input end II1 of one end connecting test system Micro FLEX of K17, other end ground connection；
The shielded layer of an amplifier ring noninverting input NII1 of one end connecting test system Micro FLEX of relay K18, it is another
End ground connection.
It is in parallel with relay K5 after relay K6 series resistances R1, parallel branch one end connecting test system Micro
The amplifier ring reverse input end II1 of FLEX, the parallel branch other end are connect with the reverse input end of AD8041 to be measured.According to
The resistance value of the requirement of AD8041 product manuals, resistance R1 is 2K Ω.
With AD8041's to be measured after the amplifier ring noninverting input NII1 series relay K3 of test system Micro FLEX
Noninverting input（That is pin 3）Connection.
After the vision signal output end VHFAC SRCI+ series relay K2 in the same direction of test system Micro FLEX with it is to be measured
The noninverting input of AD8041（That is pin 3）Connection, the vision signal inverse output terminal VHFAC of test system Micro FLEX
It is grounded after SRCI- connection resistance R10.According to the requirement of AD8041 product manuals, the resistance value of resistance R10 is 50 Ω.
After the intermediate-freuqncy signal output end BBAC SRCI+ series relay K1 in the same direction of test system Micro FLEX with it is to be measured
The noninverting input of AD8041 connects, the intermediate-freuqncy signal inverse output terminal BBAC SRCI- connection electricity of test system Micro FLEX
It is grounded after resistance R9.According to the requirement of AD8041 product manuals, the resistance value of resistance R9 is 50 Ω.
Relay K4 is connect with one end after resistance R2 series connection with the noninverting input of AD8041 to be measured, other end ground connection.Root
According to the requirement of AD8041 product manuals, the resistance value of resistance R2 is 50 Ω.
Test system Micro FLEX power for AD8041 to be measured.In the positive power source terminal of AD8041 to be measured（That is pin 7）With
Two filter capacitors in parallel, the capacitance according to the requirement of AD8041 product manuals, two filter capacitors are respectively between ground
0.1UF and 10UF.In the negative power end of AD8041 to be measured（That is pin 4）Also two filter capacitors in parallel between ground, according to
The capacitance of the requirement of AD8041 product manuals, two filter capacitors is respectively 0.1UF and 10UF.Test system Micro
FLEX is the enabled power supply of AD8041 to be measured.
Relay K8 series resistance R3, the series arm one end connect the reverse input end of AD8041 to be measured, and the other end connects
The output end of AD8041 is surveyed in reception（Pin 6）；Relay K9 series resistance R4, the series arm one end connect AD8041's to be measured
Reverse input end, the other end connect the output end of AD8041 to be measured；The one end relay K10 connects the reversed input of AD8041 to be measured
End, the other end connect the output end of AD8041 to be measured.According to the requirement of AD8041 product manuals, the resistance value of resistance R3 is 1K Ω,
The resistance value of resistance R4 is 2K Ω.
The intermediate-freuqncy signal of test system Micro FLEX is connected to after the output end of AD8041 to be measured, that is, series relay K14
The intermediate-freuqncy signal reverse measuremenet end BBAC CAP I- series electricals of measuring ends B BAC CAP I+ in the same direction, test system Micro FLEX
It is grounded after resistance R11.According to the requirement of AD8041 product manuals, the resistance value of resistance R3 is 2K Ω.
The vision signal that test system Micro FLEX are connected to after the output end series relay K15 of AD8041 to be measured is same
To measurement end VHFAC CAP I+, the vision signal reverse measuremenet end VHFAC CAP I- ground connection of test system Micro FLEX.
The amplifier ring output of test system Micro FLEX is connected to after the output end series relay K16 of AD8041 to be measured
Hold OUT1.
One end connects the output end of AD8041 to be measured, other end ground connection after relay K11 series resistances R5.Relay K12
One end connects the output end of AD8041 to be measured, other end ground connection after series resistance R6.One end connects after relay K13 series resistances R7
The output end of AD8041, other end ground connection are surveyed in reception.One end connects the output of AD8041 to be measured after relay K19 series resistances R8
End, other end ground connection.According to the requirement of AD8041 product manuals, the resistance value of resistance R5 is 50 Ω, and the resistance value of resistance R6 is 1K Ω,
The resistance value of resistance R7 is 100 Ω, and the resistance value of resistance R8 is 2K Ω.
The present embodiment AD8041 electric performance test methods are as follows：
1, gain bandwidth product（GainBandwidth）：
According to the requirement of AD8041 product manuals, -3db small signal bandwidths, Vo<0.5Vpp, wherein Vo is to be measured
The output of AD8041 output ends, Vpp are peak value；
To test the gain bandwidth product of AD8041 to be measured, relay K2, K4, K10, K15, K19 are closed, and set 2K Ω loads,
Circuit is set to become forward gain G=+ 1；VHFAC SRC1+ send 0.2Vpp, the sine wave of 130MHz-160MHz；VHFAC CAP1+
Capture Vo；Calculating GainBandwidth=（130-160MHz）*Vo/0.2.
2, output voltage conversion rate（Slew Rate）：
Relay K3, K6, K9, K16, K19 are closed, and set 2K Ω loads, circuit is made to become backward gain G=- 1；Amplifier ring is anti-
To input terminal II1 feet 2V is generated using the high-speed pulse HPD in the PLFunction inside test system Micro FLEX
Step；Setting rises starting voltage Vtl and end point voltage Vth, is surveyed and is risen with the PLTime inside test system Micro FLEX
Time；Slew Rate=（Vth-Vtl）/ the rise time.
3. total harmonic distortion（THD）：
Relay K1, K6, K9, K12, K14 is closed, and circuit is made to become forward gain G=+ 2, is loaded as 1K Ω, is utilized BBAC
SRC sends out the sine wave of 1Mhz, 2Vpp to AD8041 to be measured；It is caught using the BBAC CAP inside test system Micro FLEX
Obtain waveform；THD is calculated with the DSP inside test system Micro FLEX.
4. DC performance is tested：
When testing input offset voltage, input offset voltage, input offset current, open-loop gain, relay K3, K5,
K16 is closed.
5. input characteristics is tested：
When testing input resistance, common mode input range, common-mode rejection ratio, relay K3, K5, K16 are closed.
6. output characteristics：
A. the amplitude of oscillation is tested：According to the requirement of AD8041 product manuals, when loading RL=10K Ω（Test system Micro
The built-in loads of FLEX）, relay K3, K5, K16 are closed；When loading RL=1K Ω, relay K3, K5, K12, K16 are closed；When
When loading RL=50 Ω, relay K3, K5, K11, K16 are closed.The input terminal of AD8041 to be measured send small signal, surveys AD8041 to be measured
Output signal level, the input terminal of AD8041 to be measured send reversed small signal, surveys the output signal level of AD8041 to be measured.
B. output current is surveyed：The load of Ω is set to 0 by testing in system Micro FLEX, making alive surveys electric current, first adds 0A
Electric current survey voltage, then add the voltage value that measures, survey current value.Institute's making alive, electric current have test system Micro FLEX to carry
For.
C. short circuit current is tested：By testing load resistance built in system Micro FLEX/DC30 settings, pressurize flow measurement,
First plus 0A electric currents, voltage is surveyed, then adds the voltage value measured, built-in instrument relay is closed, and adds 0V voltages, surveys current value.It is added
Voltage, electric current have test system Micro FLEX offers.
7. power supply Power Supply：
The channels quiescent current Quiescent Current, DC30 making alive surveys electric current；Electric current after enabled closing
Quiescent Current（Disable）, DC30 send in channel close voltage give AD8041 to be measured the 8th pin, in addition with DC30
Send the supply pin of AD8041 to be measured in channel（The 4th pin and the 7th pin of AD8041 i.e. to be measured）, survey electric current.
8. enabled characteristic Disable Char：
It tests switch time, relay K3, K4, K6, K9, K16, K19 are closed, and set 2K Ω loads, circuit is made to become positive
Gain G=+ 2, the DCFunction tested inside system Micro FLEX send pulse signal to the 8th pin of AD8041 to be measured, fortune
Put ring noninverting input N2V signals are sent, the 6th pin of the 8th pin and AD8041 to be measured of AD8041 to be measured is surveyed（Output end）
Between the pin-to-pin times.Survey shutdown isolation（Off Isolation）, relay K3, K4, K6, K9, K13 be closed, and sets 100
Ω is loaded（R7）, circuit is made to become the 8th pin of forward gain G=+ 2, AD8041 to be measured to-Vs, amplifier ring noninverting input NAdd 2Vpp, 5Mhz, is captured using the PLCapture tested inside system Micro FLEX or with BBAC CAP1+ to be measured
The output Vo, Isolation=20log (2Vpp/Vo) of the output end of AD8041.
The high speed operation amplifier test circuit based on FLEX of the present embodiment is tested using Box Guard, is being surveyed
It when trying small signal, is shielded using shielded layer Guard, when carrying out high speed test, is shielded using shielded layer Guard ground connection.
In view of meeting the requirement of high speed test, K2, K4, K10, K15, K19 bandwidth that is chosen to be of relay are 1Ghz, relay K1,
K3, K6, K9, K12, K16 bandwidth 100Mhz or more, each relay connect USER POWER 12V and UDBxx, and relay selects
With A type relays.Group line（The conducting wire of connection operational amplifier, test system, resistance, relay）Impedance be 50 Ω, resistance
Precision 0.1%.Input and output use symmetrical impedance operator, i.e. source and capture to use identical impedance.The design of feedback circuit is adopted
Several groups of different impedances have been taken, according to the requirement of product detail specification, when output loading difference, have selected different feedback electricity
Road.
Claims (4)
1. the high speed operation amplifier test circuit based on FLEX, which is characterized in that using test system Micro FLEX tests
The electrical property of high speed operation amplifier；High speed operation amplifier to be measured reverse input end with test system Micro FLEX's
At least two relay branches in parallel between one amplifier ring reverse input end, the shielded layer of the amplifier ring reverse input end by after
Electric appliance may be selected to be connected to the ground；The noninverting input of high speed operation amplifier to be measured passes through the first relay branch and test respectively
The corresponding amplifier ring noninverting inputs of system Micro FLEX, vision signal output end in the same direction, intermediate-freuqncy signal output end in the same direction connect
It connects, the shielded layer of the amplifier ring noninverting input may be selected to be connected to the ground by relay；High speed operation amplifier to be measured it is same
It also connects to input terminal and is grounded after one second relay branch；The reverse input end of high speed operation amplifier to be measured and high speed to be measured
Multiple relay branches in parallel between the output end of operational amplifier；Between the output end and ground of high speed operation amplifier to be measured simultaneously
Join multiple load branch, the load branch is the series circuit of relay and resistance；The output of high speed operation amplifier to be measured
Intermediate-freuqncy signal in the same direction measurement end, vision signal of the end respectively by the first relay branch and test system Micro FLEX are in the same direction
Measurement end, the connection of amplifier ring output end；The second relay branch is the series circuit of relay or relay and resistance.
2. the high speed operation amplifier test circuit based on FLEX as described in right wants 1, which is characterized in that high-speed computation to be measured
Two filter capacitors at least in parallel between the positive power source terminal of amplifier and ground.
3. the high speed operation amplifier test circuit based on FLEX as described in right wants 1 or 2, which is characterized in that high speed to be measured
Two filter capacitors at least in parallel between the negative power end of operational amplifier and ground.
4. the high speed operation amplifier test circuit based on FLEX as described in right wants 1, which is characterized in that high-speed computation to be measured
Amplifier is AD8041.
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| CN201310293454.8A CN104280679B (en) | 2013-07-12 | 2013-07-12 | High speed operation amplifier test circuit based on FLEX |
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| CN201310293454.8A CN104280679B (en) | 2013-07-12 | 2013-07-12 | High speed operation amplifier test circuit based on FLEX |
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| CN105372525A (en) * | 2015-11-09 | 2016-03-02 | 上海芯哲微电子科技有限公司 | Test circuit for operational amplifier |
| CN108226746B (en) * | 2017-11-27 | 2020-11-20 | 上海精密计量测试研究所 | Micro FLEX-based transconductance operational amplifier MAX436 test method |
| CN110133403B (en) * | 2019-05-15 | 2023-04-18 | 西北核技术研究院 | Operational amplifier on-line test circuit and method suitable for radiation environment |
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| CN201837645U (en) * | 2010-11-02 | 2011-05-18 | 航天科工防御技术研究试验中心 | Test adapter for operational amplifiers |
| CN103024015A (en) * | 2012-12-05 | 2013-04-03 | 新华网股份有限公司 | Flex based cross-platform method for uploading files after message digest 5 (md5) value is checked at browser end |
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| JPH063375B2 (en) * | 1986-04-09 | 1994-01-12 | 多摩川精機株式会社 | Flex gyroscope |
| US8969815B2 (en) * | 2010-07-21 | 2015-03-03 | Siemens Medical Solutions Usa, Inc. | Power distribution in MR-PET imaging system integration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201837645U (en) * | 2010-11-02 | 2011-05-18 | 航天科工防御技术研究试验中心 | Test adapter for operational amplifiers |
| CN103024015A (en) * | 2012-12-05 | 2013-04-03 | 新华网股份有限公司 | Flex based cross-platform method for uploading files after message digest 5 (md5) value is checked at browser end |
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