CN2596668Y - Active feedback voltage follower - Google Patents
Active feedback voltage follower Download PDFInfo
- Publication number
- CN2596668Y CN2596668Y CN 02281301 CN02281301U CN2596668Y CN 2596668 Y CN2596668 Y CN 2596668Y CN 02281301 CN02281301 CN 02281301 CN 02281301 U CN02281301 U CN 02281301U CN 2596668 Y CN2596668 Y CN 2596668Y
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- voltage follower
- output
- follower
- input end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses an active feedback voltage follower, which is composed of two identical operational amplifiers A#-[1], A#-[2] which shares the same power source, wherein, a co-phrase input end of an operational amplifier A#-[1] is connected with an input end A of a signal of the power source, and the output end of the operational amplifier A#-[1] is connected with an output end 5 of a circuit. Simultaneously, the output end of the operational amplifier A#-[1] is connected with a co-phrase input end of an operational amplifier A#-[2], and the output end of the operational amplifier A#-[2] is connected with an inverse input end of the operational amplifier A#-[1]. A feedback voltage follower can be formed by the additional arrangement of an operational amplifier, which improves the precision of output voltage of the voltage follower and solves the problem that the input signals and the output signals of a common voltage follower are large. The utility model can lead signal errors to be reduced for above 20dB, and can be used for voltage following circuits of various electronic instruments, with the advantages of simple structure and low cost.
Description
Technical field:
The utility model provides a kind of active voltage feedback follower, relates to the improvement technical field of amplifier architecture.
Background technology:
At present, the voltage follower of forming by operational amplifier, in application process, because the influence of factors such as the fluctuation of operational amplifier power supply, internal noise and dynamic responding speed is not quite similar output signal and input signal, exist error, influenced the operating accuracy of these parts,, adopted methods such as high-precision operational amplifier and raising power quality usually in order to reduce this error, increased equipment cost greatly, and effect is not really desirable.
Summary of the invention:
The utility model provides a kind of active feedback voltage follower, greatly reduces the error of input, output signal, has guaranteed the precision of operational amplifier, has improved the performance of instrument and equipment.
Technical solution of the present utility model is as follows: input, output feedback by two of shared same power supply identical operational amplifier A 1, A2 connect and compose active feedback voltage follower, wherein, input signal Vin is connected to the in-phase input end of operational amplifier A 1 through the input A of follower, operational amplifier A 1 output is connected to the output B of follower, simultaneously operational amplifier A
1Output termination operational amplifier A
2In-phase input end, operational amplifier A
2Output termination operational amplifier A
1, A
2Inverting input.
A
1And A
2Be two operational amplifiers that the performance model is identical, be integrated in two operational amplifier better effects if in dual operational amplifier in the chip piece or the four-operational amplifier as employing, select for use same model, with batch element operational amplifier effect take second place.
Good effect of the present utility model is: constitute the feedback voltage follower by installing an operational amplifier additional, improved the output voltage precision of voltage follower greatly, solved the problem that the common voltage follower is imported, the output signal error is big, circuit structure is simple, with low cost, signal errors is reduced more than the 20dB, can be widely used in the various electronic testing instruments.
Description of drawings:
Fig. 1 is the utility model circuit theory diagrams.
A
1～operational amplifier, A
2～operational amplifier, A～follower input, B～follower output.
Embodiment:
According to shown in Figure 1, adopt a slice dual operational amplifier μ A747 to constitute active feedback voltage follower, input signal Vin is connected to the in-phase input end of operational amplifier A 1 through the input A of follower, and operational amplifier A 1 output is connected to the output B of follower, simultaneously operational amplifier A
1Output termination operational amplifier A
2In-phase input end, operational amplifier A
2Output termination operational amplifier A
1, A
2Inverting input.When input letter signal is that amplitude is 2.5V, frequency when being 1KHz sinusoidal wave, error amount is 50 μ V, and under the identical situation of operational environment, power supply, adopting among the μ A747 error of the common voltage follower that single operational amplifier constitutes is 600 μ V.
Claims (1)
1, a kind of active feedback voltage follower, it is characterized in that: input, output feedback by two of shared same power supply identical operational amplifier A 1, A2 connect and compose active feedback voltage follower, wherein, input signal Vin is connected to the in-phase input end of operational amplifier A 1 through the input A of follower, operational amplifier A 1 output is connected to the output B of follower, simultaneously operational amplifier A
1Output termination operational amplifier A
2In-phase input end, operational amplifier A
2Output termination operational amplifier A
1, A
2Inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02281301 CN2596668Y (en) | 2002-11-20 | 2002-11-20 | Active feedback voltage follower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02281301 CN2596668Y (en) | 2002-11-20 | 2002-11-20 | Active feedback voltage follower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2596668Y true CN2596668Y (en) | 2003-12-31 |
Family
ID=33743723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02281301 Expired - Fee Related CN2596668Y (en) | 2002-11-20 | 2002-11-20 | Active feedback voltage follower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2596668Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526035A (en) * | 2017-10-11 | 2017-12-29 | 荣成市华诚橡胶有限公司 | A kind of overload early-warning device of Rubber Conveyor Belt Scrap |
| CN107546720A (en) * | 2017-10-11 | 2018-01-05 | 荣成市华诚橡胶有限公司 | A kind of emergency stop device of Rubber Conveyor Belt Scrap |
| CN107555127A (en) * | 2017-10-11 | 2018-01-09 | 荣成市华诚橡胶有限公司 | A kind of material induction installation of Rubber Conveyor Belt Scrap |
-
2002
- 2002-11-20 CN CN 02281301 patent/CN2596668Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526035A (en) * | 2017-10-11 | 2017-12-29 | 荣成市华诚橡胶有限公司 | A kind of overload early-warning device of Rubber Conveyor Belt Scrap |
| CN107546720A (en) * | 2017-10-11 | 2018-01-05 | 荣成市华诚橡胶有限公司 | A kind of emergency stop device of Rubber Conveyor Belt Scrap |
| CN107555127A (en) * | 2017-10-11 | 2018-01-09 | 荣成市华诚橡胶有限公司 | A kind of material induction installation of Rubber Conveyor Belt Scrap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |