CN108549010A - Input offset voltage of operational amplifier system for testing stability - Google Patents
Input offset voltage of operational amplifier system for testing stability Download PDFInfo
- Publication number
- CN108549010A CN108549010A CN201810676779.7A CN201810676779A CN108549010A CN 108549010 A CN108549010 A CN 108549010A CN 201810676779 A CN201810676779 A CN 201810676779A CN 108549010 A CN108549010 A CN 108549010A
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- China
- Prior art keywords
- operational amplifier
- pcb board
- measured
- input offset
- offset voltage
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to operational amplifiers,More particularly to input offset voltage of operational amplifier system for testing stability,Including computer and metal box,Metal box is built in the oil body in oil groove and ground connection,Metal box is equipped with the metal screen entered for oil body,Metal box is equipped with power interface connector and signaling interface connector,Pcb board is equipped in metal box,Pcb board is connected with metal box insulation,Pcb board is equipped with operational amplifier to be measured,Operational amplifier to be measured constitutes feedback amplifier with the capacitance resistance on pcb board,Pcb board is equipped with power interface and signaling interface,Computer is connected with the linear DC power supply for powering for operational amplifier to be measured,Linear DC power supply is connected by power interface connector with power interface,Computer is connected with the voltage collector for acquiring op-amp output voltage to be measured；Technical solution provided by the present invention can effectively overcome the test result present in the prior art to be easy the defect by ambient temperature effect.
Description
Technical field
The present invention relates to operational amplifiers, and in particular to input offset voltage of operational amplifier system for testing stability.
Background technology
Operational amplifier is widely used in various electronic equipments, primarily serves the functions such as signal acquisition, amplification, operation.
In order to ensure the quality of such product, production unit needs to carry out the test of all kinds of parameters to it, wherein input imbalance electricity
Pressure long-time stability parameter (Long-termVosStability) describes operational amplifier product input offset voltage parameter
Change with time degree, is indicated with Δ Vos/time, unit uV/Month, which is that measurement operational amplifier quality is steady
Qualitative important indicator.
Input offset voltage long term stability tests are more demanding, and by taking certain product as an example, which is 1uV/
Month, i.e., the parameter drift in one month are no more than 1uV, realize that high-acruracy survey is such properties of product of accurate evaluation to it
Basic link.
It is Vos1 that input offset voltage long-time stability generally measure input offset voltage before being powered continuously work first,
Then device is allowed to be in continuous work 1 month under room temperature normal power-up working condition (being exposed to regular air conditions), experiment knot
Beam at once removes sample from power-up working plate, and measuring input offset voltage on operational amplifier dedicated tester is
Vos2, it is the test value of the parameter to take the value of Vos2-Vos1.
Said program, test result is easy to be influenced by ambient temperature changing factor, as a result not accurate enough.Operation amplifier
The input offset voltage parameter of device itself has the characteristics that drift about to environment temperature sensitive：Its input offset voltage parameters of temperature system
Number is suitable with parameter ranges to be measured and has relevance.Input offset voltage of operational amplifier parameter can become with temperature
Change, if 1 DEG C of variation occurs for ambient temperature or sample temperature before and after sample, influence the result of input offset voltage parameter with
The product variation occurred in 1 month itself is suitable.
Invention content
(1) the technical issues of solving
For the disadvantages mentioned above present in the prior art, the present invention provides input offset voltage of operational amplifier stability
Test system can effectively overcome the test result present in the prior art to be easy the defect by ambient temperature effect.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：
Input offset voltage of operational amplifier system for testing stability, including computer and metal box, in the metal box
The oil body being placed in oil groove and ground connection, the metal box are equipped with the metal screen entered for oil body, and the metal box is equipped with
Power interface connector and signaling interface connector, the metal box is interior to be equipped with pcb board, and the pcb board connects with metal box insulation
It connects, the pcb board is equipped with operational amplifier to be measured, and the operational amplifier to be measured constitutes anti-with the capacitance resistance on pcb board
Amplifying circuit is presented, the pcb board is equipped with power interface and signaling interface；
The computer is connected with the linear DC power supply for powering for operational amplifier to be measured, the linear direct current motor
Source is connected by power interface connector with power interface, the computer with for acquiring op-amp output voltage to be measured
Voltage collector be connected, the voltage collector is connected by signaling interface connector with signaling interface, the computer pair
After the voltage of voltage collector acquisition reduces corresponding multiple, the stability of input offset voltage of operational amplifier to be measured is calculated；
The computer with for the temperature of oil body in oil groove to be monitored and is adjusted and ensures that oil body temperature is constant
Temperature monitoring module is connected, and the temperature monitoring module includes the temperature sensor being set in oil groove and heating tube.
Preferably, the pcb board is equipped with the test bench for operational amplifier to be measured installation, and the test bench detachably weighs
It is multiple to use.
Preferably, the pcb board is connected by four insulated columns and metal box insulation.
Preferably, the power interface connector, signaling interface connector core number with the fortune to be measured on pcb board
Calculate the number matching of amplifier.
Preferably, the amplification factor of the feedback amplifier is 1000, and the resistance uses the high-accuracy metal of RJ711 types
Foil resistance, the capacitance use conventional patch capacitance.
Preferably, the oil body in the oil groove be heat conduction, it is non-conductive, it is easy flowing, performance stablize liquid oil body.
Preferably, the temperature monitoring module control oil body temperature is constant at 25 DEG C.
Preferably, the computer is separately connected linear DC power supply, temperature monitoring module and voltage by RS232 buses
Collector.
Preferably, metal screen there are three being opened up at the top of the metal box.
(3) advantageous effect
Compared with prior art, input offset voltage of operational amplifier system for testing stability provided by the present invention will wait for
It surveys operational amplifier to be placed in liquid oil body environment, the influence for making operational amplifier to be measured fluctuate from air dielectric, and to oil
Body carries out thermostatic control, eliminates interference of the temperature change to test, while operational amplifier to be measured is also built in metal box,
Metal box ground connection plays the role of being electromagnetically shielded operational amplifier to be measured, and the capacitance of operational amplifier to be measured and periphery
Resistance forms feedback amplifier, keeps the measurement of output voltage more accurate, not only eliminates the influence of environment temperature factor, together
When error is further reduced from measurement method, measured input offset voltage long-time stability parameter is more nearly true feelings
Condition.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described.It should be evident that the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is present system structural schematic diagram；
Fig. 2 is oil groove internal structure schematic diagram of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Input offset voltage of operational amplifier system for testing stability, as depicted in figs. 1 and 2, including computer and metal
Box, metal box are built in the oil body in oil groove and ground connection, and metal box is equipped with the metal screen entered for oil body, is set in metal box
There are power interface connector and signaling interface connector, pcb board is equipped in metal box, pcb board is connected with metal box insulation, PCB
Plate is equipped with operational amplifier to be measured, and operational amplifier to be measured constitutes feedback amplifier, PCB with the capacitance resistance on pcb board
Plate is equipped with power interface and signaling interface；
For computer with for being connected for the linear DC power supply of operational amplifier to be measured power supply, linear DC power supply passes through electricity
Source interface connector is connected with power interface, computer and the voltage collector for acquiring op-amp output voltage to be measured
It is connected, voltage collector is connected by signaling interface connector with signaling interface, the voltage that computer acquires voltage collector
After reducing corresponding multiple, the stability of input offset voltage of operational amplifier to be measured is calculated；
Computer with for the temperature of oil body in oil groove to be monitored and is adjusted and ensures oil body temperature stationary temperature
Monitoring module is connected, and temperature monitoring module includes the temperature sensor being set in oil groove and heating tube.
Pcb board is equipped with the test bench for operational amplifier to be measured installation, and test bench is detachably reused.
Pcb board is connected by four insulated columns and metal box insulation.
Power interface connector, signaling interface connector core number with the operational amplifier to be measured on pcb board
Number matches.
The amplification factor of feedback amplifier is 1000, and resistance uses RJ711 type high-precision metal foil resistance, capacitance to use
Conventional patch capacitance.
Oil body in oil groove is the liquid oil body that heat conduction, non-conductive, easy flowing, performance are stablized.
It is constant at 25 DEG C that temperature monitoring module controls oil body temperature.
Computer is separately connected linear DC power supply, temperature monitoring module and voltage collector by RS232 buses.
Metal screen there are three being opened up at the top of metal box.
In order to increase the durability of this system, multiple test benches can be set, and operational amplifier to be measured passes through survey on pcb board
Examination seat is connect with pcb board, detachable to be multiplexed.Pcb board both ends are respectively equipped with power interface and signaling interface, and power interface is for connecing
Enter linear DC power supply, signaling interface is used for output voltage data.Power interface is connect by cable with metal box power interface
Device is connected, and signaling interface is connected by cable with metal box signaling interface connector, in the core number and pcb board of connector
The number of operational amplifier to be measured matches.
Metal box is placed in oil groove, and by metal screen and sample and circuit heat exchange, while metal can occur for oil body
Box is grounded, and can play the role of electromagnetic shielding.Pcb board is built in metal box bottom, exhausted by four insulated columns and metal box
Edge connects.Intermediate installs connector on the left of metal box, is power interface connector, and inside passes through cable and pcb board power interface
Connection, outside are connect by cable with linear power supply；Intermediate on the right side of metal box to install signaling interface connector, inside passes through cable
It is connect with pcb board signaling interface, outside is connect by cable with voltage collector.
Voltage collector can precise acquisition op-amp output voltage to be measured, originally be in uV magnitudes input lack of proper care
Voltage is amplified to mV magnitudes through feedback amplifier, and the instruction that high-precision precision digital multimeter can receive computer is light
Pine accurately acquires the voltage signal of mV magnitudes.
Oil body in oil groove is intended to completely cut off air, provides isoperibol for operational amplifier to be measured, the oil body of use should be
The liquid oil body that heat conduction, non-conductive, easy flowing, performance are stablized, and temperature monitoring module control oil body temperature is constant at 25 DEG C, base
Influence of the environment temperature to test parameter is eliminated in sheet.
Computer completes the control to linear DC power supply, temperature monitoring module and voltage collector by RS232 buses,
Simultaneously steady temperature is adjusted to oil sump temperature with analysis by the acquisition of temperature data, the acquisition for passing through output voltage signal passes through
It crosses analysis and input offset voltage long-time stability parameter is calculated, complete test.
Input offset voltage of operational amplifier system for testing stability provided by the present invention sets operational amplifier to be measured
In liquid oil body environment, the influence for making operational amplifier to be measured be fluctuated from air dielectric, and thermostatic control is carried out to oil body,
Interference of the temperature change to test is eliminated, while operational amplifier to be measured is also built in metal box, metal box ground connection is played
Effect to operational amplifier to be measured electromagnetic shielding, and operational amplifier to be measured and the capacitance resistance of periphery are formed to feed back and be put
Big circuit, keeps the measurement of output voltage more accurate, not only eliminates the influence of environment temperature factor, while from measurement method
It is further reduced error, measured input offset voltage long-time stability parameter is closer to the truth.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the essence of corresponding technical solution can't be made to be detached from the spirit and scope of various embodiments of the present invention technical solution.
Claims (9)
1. input offset voltage of operational amplifier system for testing stability, it is characterised in that：It is described including computer and metal box
Metal box is built in the oil body in oil groove and ground connection, and the metal box is equipped with the metal screen entered for oil body, the metal
Box is equipped with power interface connector and signaling interface connector, and pcb board, the pcb board and metal are equipped in the metal box
Box insulation connection, the pcb board are equipped with operational amplifier to be measured, the operational amplifier to be measured and the capacitance electricity on pcb board
Resistance constitutes feedback amplifier, and the pcb board is equipped with power interface and signaling interface；
For the computer with for being connected for the linear DC power supply of operational amplifier to be measured power supply, the linear DC power supply is logical
It crosses power interface connector with power interface to be connected, the computer and the electricity for acquiring op-amp output voltage to be measured
Collector is pressed to be connected, the voltage collector is connected by signaling interface connector with signaling interface, and the computer is to voltage
After the voltage of collector acquisition reduces corresponding multiple, the stability of input offset voltage of operational amplifier to be measured is calculated；
The computer with for the temperature of oil body in oil groove to be monitored and is adjusted and ensures oil body temperature stationary temperature
Monitoring module is connected, and the temperature monitoring module includes the temperature sensor being set in oil groove and heating tube.
2. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Pcb board is equipped with the test bench for operational amplifier to be measured installation, and the test bench is detachably reused.
3. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Pcb board is connected by four insulated columns and metal box insulation.
4. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Power interface connector, signaling interface connector core number matched with the number of the operational amplifier to be measured on pcb board.
5. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
The amplification factor of feedback amplifier is 1000, and the resistance uses RJ711 type high-precision metal foil resistance, the capacitance to use
Conventional patch capacitance.
6. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Oil body in oil groove is the liquid oil body that heat conduction, non-conductive, easy flowing, performance are stablized.
7. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
It is constant at 25 DEG C that temperature monitoring module controls oil body temperature.
8. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Computer is separately connected linear DC power supply, temperature monitoring module and voltage collector by RS232 buses.
9. input offset voltage of operational amplifier system for testing stability according to claim 1, it is characterised in that：It is described
Metal screen there are three being opened up at the top of metal box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810676779.7A CN108549010A (en) | 2018-06-27 | 2018-06-27 | Input offset voltage of operational amplifier system for testing stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810676779.7A CN108549010A (en) | 2018-06-27 | 2018-06-27 | Input offset voltage of operational amplifier system for testing stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108549010A true CN108549010A (en) | 2018-09-18 |
Family
ID=63494143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810676779.7A Pending CN108549010A (en) | 2018-06-27 | 2018-06-27 | Input offset voltage of operational amplifier system for testing stability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108549010A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201984122U (en) * | 2011-01-28 | 2011-09-21 | 保定天威集团有限公司 | Transformer synthesis and intelligent assessment device |
| CN103675651A (en) * | 2013-12-25 | 2014-03-26 | 工业和信息化部电子第五研究所 | Test system of long-term stability of input offset voltage of operational amplifier |
-
2018
- 2018-06-27 CN CN201810676779.7A patent/CN108549010A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201984122U (en) * | 2011-01-28 | 2011-09-21 | 保定天威集团有限公司 | Transformer synthesis and intelligent assessment device |
| CN103675651A (en) * | 2013-12-25 | 2014-03-26 | 工业和信息化部电子第五研究所 | Test system of long-term stability of input offset voltage of operational amplifier |
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Application publication date: 20180918 |