CN204009924U - A kind of high precision absolute value circuit - Google Patents
A kind of high precision absolute value circuit Download PDFInfo
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- CN204009924U CN204009924U CN201420412080.7U CN201420412080U CN204009924U CN 204009924 U CN204009924 U CN 204009924U CN 201420412080 U CN201420412080 U CN 201420412080U CN 204009924 U CN204009924 U CN 204009924U
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- 239000003990 capacitor Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
Abstract
The utility model relates to a kind of high-precision absolute value circuit, the technical matters solving is: the high precision absolute value circuit that the accurate sine wave output absolute value of a kind of energy is provided, the technical scheme adopting is: one end of the inverting input of operational amplifier A 1 connecting resistance R3 is connected with one end of resistance R 1 with after the negative pole of diode D1, behind one end of the other end of resistance R 1 connecting resistance R2, be connected with voltage input end Vin, one end of the other end of resistance R 2 connecting resistance R6, behind one end of one end of resistance R 4 and resistance R 5, be connected with the inverting input of operational amplifier A 2, after the other end of the other end of resistance R 4 connecting resistance R3, be connected with the positive pole of diode D2, the negative pole of diode D2 and connect the positive pole of diode D1 after be connected with the output terminal of operational amplifier A 1, the other end of resistance R 5 is connected with the sliding end of potentiometer R7, be applicable to absolute value circuit.
Description
Technical field
The utility model relates to a kind of absolute value circuit, is specifically related to a kind of high-precision absolute value circuit.
Background technology
In Circuits System, the AC signal of various circuit all has negative signal component, in concrete use procedure, is needing first negative signal partly to be become to positive signal, and to need to add absolute value circuit to make output signal be the absolute value of input signal or be directly proportional to this absolute value; In prior art, what absolute value circuit was the most frequently used is directly to use commutation diode, this method is simple, but because diode exists forward voltage drop, therefore can not get high-precision absolute value voltage, and non-linear due to amplifier, make when sinusoidal wave changes in amplitude, there is deviation in the output of circuit, exactly the absolute value of sine wave output; In addition, traditional absolute value circuit mostly can only be exported the absolute value of input signal, can not export the signals such as effective value such as input signal, and range of application is narrow.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical matters to be solved is: the high precision absolute value circuit that a kind of circuit output bias absolute value less, sine wave output exactly is provided.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of high precision absolute value circuit, comprise operational amplifier A 1, after the negative pole of one end of the inverting input of described operational amplifier A 1 connecting resistance R3 and diode D1, be connected with one end of resistance R 1, behind one end of the other end of described resistance R 1 connecting resistance R2, be connected with voltage input end Vin, one end of the other end of described resistance R 2 connecting resistance R6, behind one end of one end of resistance R 4 and resistance R 5, be connected with the inverting input of operational amplifier A 2, after the other end of the other end of described resistance R 4 connecting resistance R3, be connected with the positive pole of diode D2, the negative pole of described diode D2 and connect the positive pole of diode D1 after be connected with the output terminal of operational amplifier A 1, the other end of described resistance R 5 is connected with the sliding end of potentiometer R7, the two ends of described potentiometer R7 are connected with-12V voltage with+12V voltage respectively, the other end of described resistance R 6 and connect the output terminal of operational amplifier A 2 after be connected with voltage output end Vout, the equal ground connection of in-phase input end of the in-phase input end of described operational amplifier A 1 and operational amplifier A 2.
Described absolute value circuit also comprises single-pole double-throw switch (SPDT) S1, capacitor C 1 and resistance R 8, described single-pole double-throw switch (SPDT) S1 is arranged on the circuit between described resistance R 6 and the output terminal of operational amplifier A 2, the moved end of described single-pole double-throw switch (SPDT) S1 is connected with described resistance R 6, the not moved end a1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2, the not moved end b1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2 after being connected in series described resistance R 8, and described capacitor C 1 is attempted by the two ends of described resistance R 8; The resistance of described resistance R 2, resistance R 6, resistance R 1, resistance R 3 and resistance R 4 is closed: R2=R6=2 * R1=2 * R3=2 * R4.
The utility model compared with prior art has following beneficial effect:
1, the high precision absolute value circuit in the utility model, the inverting input of the operational amplifier A 2 in adding circuit has increased the bleeder circuit being comprised of resistance R 5 and potentiometer R7, this bleeder circuit can compensate operational amplifier A 1 and the non-linear of operational amplifier A 2, make to change and constantly by regulator potentiometer R7 bucking voltage, adjust output in sinusoidal wave amplitude, the output bias of circuit is reduced, exactly the absolute value of sine wave output.
2, in the utility model, also can on the circuit between resistance R 6 and the output terminal of operational amplifier A 2, single-pole double-throw switch (SPDT) S1 be set, the moved end of single-pole double-throw switch (SPDT) S1 is connected with resistance R 6, the not moved end a1 of single-pole double-throw switch (SPDT) S1 is connected with the output terminal of operational amplifier A 2, after the not moved end b1 series resistor R8 of single-pole double-throw switch (SPDT) S1, be connected with the output terminal of operational amplifier A 2, capacitor C 1 is attempted by the two ends of resistance R 8; When the moved end of single-pole double-throw switch (SPDT) S1 is placed in not moved end a1, the absolute value of circuit sine wave output, when the moved end of single-pole double-throw switch (SPDT) S1 is placed in not moved end b1, the effective value of circuit sine wave output absolute value, make circuit more practical, increased the range of application of this high precision absolute value circuit.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is structural representation of the present utility model.
Embodiment
As shown in Figure 1, a kind of high precision absolute value circuit, comprise operational amplifier A 1, after the negative pole of one end of the inverting input of described operational amplifier A 1 connecting resistance R3 and diode D1, be connected with one end of resistance R 1, behind one end of the other end of described resistance R 1 connecting resistance R2, be connected with voltage input end Vin, one end of the other end of described resistance R 2 connecting resistance R6, behind one end of one end of resistance R 4 and resistance R 5, be connected with the inverting input of operational amplifier A 2, after the other end of the other end of described resistance R 4 connecting resistance R3, be connected with the positive pole of diode D2, the negative pole of described diode D2 and connect the positive pole of diode D1 after be connected with the output terminal of operational amplifier A 1, the other end of described resistance R 5 is connected with the sliding end of potentiometer R7, the two ends of described potentiometer R7 are connected with-12V voltage with+12V voltage respectively, the other end of described resistance R 6 and connect the output terminal of operational amplifier A 2 after be connected with voltage output end Vout, the equal ground connection of in-phase input end of the in-phase input end of described operational amplifier A 1 and operational amplifier A 2, in the present embodiment, the resistance relation of described resistance R 2, resistance R 6, resistance R 1, resistance R 3 and resistance R 4 can be: R2=R6=2 * R1=2 * R3=2 * R4, when the amplitude of input sine wave changes, by adjusting potentiometer R7, can compensate operational amplifier A 1 and operational amplifier A 2, reduced the nonlinear impact of amplifier, made the output of circuit more accurate.
Particularly, described absolute value circuit also can comprise single-pole double-throw switch (SPDT) S1, capacitor C 1 and resistance R 8, described single-pole double-throw switch (SPDT) S1 is arranged on the circuit between described resistance R 6 and the output terminal of operational amplifier A 2, the moved end of described single-pole double-throw switch (SPDT) S1 is connected with described resistance R 6, the not moved end a1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2, the not moved end b1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2 after being connected in series described resistance R 8, and described capacitor C 1 is attempted by the two ends of described resistance R 8; The design of single-pole double-throw switch (SPDT) S1, makes circuit can facilitate the effective value of sine wave output absolute value and absolute value, has strengthened the practicality of circuit.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (3)
1. a high precision absolute value circuit, it is characterized in that: comprise operational amplifier A 1, after the negative pole of one end of the inverting input of described operational amplifier A 1 connecting resistance R3 and diode D1, be connected with one end of resistance R 1, behind one end of the other end of described resistance R 1 connecting resistance R2, be connected with voltage input end Vin, one end of the other end of described resistance R 2 connecting resistance R6, behind one end of one end of resistance R 4 and resistance R 5, be connected with the inverting input of operational amplifier A 2, after the other end of the other end of described resistance R 4 connecting resistance R3, be connected with the positive pole of diode D2, the negative pole of described diode D2 and connect the positive pole of diode D1 after be connected with the output terminal of operational amplifier A 1, the other end of described resistance R 5 is connected with the sliding end of potentiometer R7, the two ends of described potentiometer R7 are connected with-12V voltage with+12V voltage respectively, the other end of described resistance R 6 and connect the output terminal of operational amplifier A 2 after be connected with voltage output end Vout, the equal ground connection of in-phase input end of the in-phase input end of described operational amplifier A 1 and operational amplifier A 2.
2. a kind of high precision absolute value circuit according to claim 1, it is characterized in that: described absolute value circuit also comprises single-pole double-throw switch (SPDT) S1, capacitor C 1 and resistance R 8, described single-pole double-throw switch (SPDT) S1 is arranged on the circuit between described resistance R 6 and the output terminal of operational amplifier A 2, the moved end of described single-pole double-throw switch (SPDT) S1 is connected with described resistance R 6, the not moved end a1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2, the not moved end b1 of described single-pole double-throw switch (SPDT) S1 is connected with the output terminal of described operational amplifier A 2 after being connected in series described resistance R 8, described capacitor C 1 is attempted by the two ends of described resistance R 8.
3. a kind of high precision absolute value circuit according to claim 1 and 2, is characterized in that: the resistance of described resistance R 2, resistance R 6, resistance R 1, resistance R 3 and resistance R 4 is closed and is: R2=R6=2 * R1=2 * R3=2 * R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420412080.7U CN204009924U (en) | 2014-07-25 | 2014-07-25 | A kind of high precision absolute value circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420412080.7U CN204009924U (en) | 2014-07-25 | 2014-07-25 | A kind of high precision absolute value circuit |
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| Publication Number | Publication Date |
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| CN204009924U true CN204009924U (en) | 2014-12-10 |
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| CN201420412080.7U Active CN204009924U (en) | 2014-07-25 | 2014-07-25 | A kind of high precision absolute value circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024654A (en) * | 2015-06-17 | 2015-11-04 | 吉林大学 | Pseudo random signal electric method frequency-selecting amplification circuit |
| CN105893889A (en) * | 2016-03-21 | 2016-08-24 | 杨露萍 | Absolute value circuit |
| CN106383540A (en) * | 2016-11-24 | 2017-02-08 | 郑州诚合信息技术有限公司 | Voltage absolute value circuit |
| CN109002739A (en) * | 2017-06-07 | 2018-12-14 | 北京普源精电科技有限公司 | A kind of absolute value circuit |
-
2014
- 2014-07-25 CN CN201420412080.7U patent/CN204009924U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024654A (en) * | 2015-06-17 | 2015-11-04 | 吉林大学 | Pseudo random signal electric method frequency-selecting amplification circuit |
| CN105893889A (en) * | 2016-03-21 | 2016-08-24 | 杨露萍 | Absolute value circuit |
| CN106383540A (en) * | 2016-11-24 | 2017-02-08 | 郑州诚合信息技术有限公司 | Voltage absolute value circuit |
| CN109002739A (en) * | 2017-06-07 | 2018-12-14 | 北京普源精电科技有限公司 | A kind of absolute value circuit |
| CN109002739B (en) * | 2017-06-07 | 2020-03-17 | 北京普源精电科技有限公司 | Absolute value circuit |
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| GR01 | Patent grant |