CN202533494U - High-accuracy peak detector - Google Patents
High-accuracy peak detector Download PDFInfo
- Publication number
- CN202533494U CN202533494U CN2012202095746U CN201220209574U CN202533494U CN 202533494 U CN202533494 U CN 202533494U CN 2012202095746 U CN2012202095746 U CN 2012202095746U CN 201220209574 U CN201220209574 U CN 201220209574U CN 202533494 U CN202533494 U CN 202533494U
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- operational amplifier
- diode
- input end
- resistance
- capacitor
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Abstract
The utility model discloses a high-accuracy peak detector. The high-accuracy peak detector comprises an operational amplifier U1, a diode D2 and an operational amplifier U2 which are connected with one another in sequence, wherein an output end of the operational amplifier U1 is connected with the cathode of the diode D2; the anode of the diode D2 is connected with a positive input end of the operational amplifier U2; a resistor R1 and a capacitor C2 which are connected in series are connected between the positive input end and a grounded end of the operational amplifier U2; a resistor R3 is connected between a negative input end of the operational amplifier U1 and a negative input end of the operational amplifier U2; a capacitor C1 is connected between an input end of the resistor R3 and an input end of the diode D2; and the negative input end of the operational amplifier U2 is also connected with an output end of the operational amplifier U2. By adopting the structure, the peak detector has small delay and high detection accuracy during detection.
Description
Technical field
The utility model relates to a kind of peak detctor, specifically is a kind of high precision peak detecting device.
Background technology
The basic circuit structure of peak detctor mainly is made up of sampling, holding circuit and voltage comparator circuit.The simplest peak detection circuit is that diode and electric capacity are formed charge-discharge circuit, utilizes the unidirectional conduction of diode and the memory action of capacitor to constitute testing circuit, and wherein switching diode is as comparator circuit, and capacitor storage is as holding circuit.The ultimate principle that peak value detects is: when the voltage Vin of input signal increased, peak detection circuit was sampled, and makes output voltage V out can follow input voltage vin well; When input voltage vin began to reduce, circuit got into the maintenance stage, and this moment PV is kept getting off and output, and when input voltage vin during once more greater than this moment sustaining voltage, output voltage V out follows the tracks of input voltage vin again and adopts; Have only when reset signal arrives, output voltage V out just discharges and makes zero, and begins the following one-period of peak value employing-maintenance then again.
The switching diode of general peak detctor is severe at the retardation ratio from the off-state to the on-state, and the output overshoot that is associated of transition is more relatively therewith, makes that the overall precision of peak detection circuit is relatively low.
The utility model content
The utility model provides a kind of high precision peak detecting device, has solved peak detctor in the past in testing process, postpone bigger, the not high problem of accuracy of detection.
The utility model is that the technical solution problem mainly realizes through following technical scheme: a kind of high precision peak detecting device; Comprise the operational amplifier U1, diode D2 and the operational amplifier U2 that connect successively; The output terminal of said operational amplifier U1 is connected with the negative pole of diode D2; The positive pole of diode D2 is connected with the positive input terminal of operational amplifier U2; Be connected with the resistance R 1 and capacitor C 2 of connecting between the positive input terminal of said operational amplifier U2 and the earth terminal; Be connected with resistance R 3 between the negative input end of the negative input end of said operational amplifier U1 and operational amplifier U2, be connected with capacitor C 1 between the input end of the input end of said resistance R 3 and diode D2, and the negative input end of operational amplifier U2 also is connected with the output terminal of operational amplifier U2.
Be connected with diode D1 between the negative pole of the negative input end of said operational amplifier U1 and diode D2, and the positive pole of diode D1 is connected with the negative pole of diode D2.
Also be connected with resistance R 2 between said operational amplifier U2 and the earth terminal, the resistance of said resistance R 2 is 10M Ω.
The resistance of said resistance R 1 is 390 Ω, and the resistance of said resistance R 3 is 1.8k Ω.
The capacitance of said capacitor C 1 is 1nF, and the capacitance of said capacitor C 2 is 10pF.
The utility model compared with prior art has the following advantages and beneficial effect:
(1) the utility model is through being connected diode D2 between the negative pole of the negative input end of operational amplifier U1 and diode D1; When operational amplifier U1 remains on state of saturation; D2 closes the negative feedback loop of U1, makes D1 taper to minimum level from the time delay that off-state switches to on-state.
(2) the utility model has also significantly reduced the output overshoot through diode D2, thereby has improved accuracy of detection.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with embodiment the utility model is done further to specify, but the embodiment of the utility model is not limited thereto.
Embodiment:
As shown in Figure 1; The utility model comprises operational amplifier U1, diode D2 and the operational amplifier U2 that connects successively; The output terminal of operational amplifier U1 is connected with the negative pole of diode D2; The positive pole of diode D2 is connected with the positive input terminal of operational amplifier U2, and the negative input end of operational amplifier U2 also is connected with the output terminal of operational amplifier U2.
Be connected with the resistance R 1 and capacitor C 2 of connecting between the positive input terminal of the operational amplifier U2 of present embodiment and the earth terminal; The resistance of resistance R 1 is 390 Ω; The capacitance of capacitor C 2 is 10pF; The overshoot that R1 and C2 produce when being used for further suppressing transition between hold period and the charge cycle is because the phase shift and the decay of their backfeed loops can limit high frequency the time.
Be connected with resistance R 3 between the negative input end of the operational amplifier U1 of present embodiment and the negative input end of operational amplifier U2, the resistance of resistance R 3 is 1.8k Ω.
Be connected with capacitor C 1 between the input end of the resistance R 3 of present embodiment and the input end of diode D2, the capacitance of capacitor C 1 is 1nF.
Be connected with diode D1 between the negative input end of the operational amplifier U1 of present embodiment and the negative pole of diode D2, and the positive pole of diode D1 is connected with the negative pole of diode D2.
Also be connected with resistance R 2 between the operational amplifier U2 of present embodiment and the earth terminal, the resistance of resistance R 2 is 10M Ω.
The principle of work of the utility model is: when the voltage Vin of input signal increased, peak detctor began to sample, and makes output voltage V out can follow input voltage vin well; When input voltage vin began to reduce, circuit got into the maintenance stage, and this moment PV is kept getting off and output, and when input voltage vin during once more greater than this moment sustaining voltage, output voltage V out follows the tracks of input voltage vin again and adopts; Have only when reset signal arrives, output voltage V out just discharges and makes zero, and begins the following one-period of peak value employing-maintenance then again; When operational amplifier U1 remained on the deflection state of saturation, diode D1 closed the negative feedback loop of U1, made the output of U1 in the 0.7V voltage belt, follow its input waveform.
The model of above-mentioned device selects situation following:
Operational amplifier U1:LM6361
Operational amplifier U2:LF411
Diode D1:1N4148
Diode D2:1N4148
As stated, then can realize the utility model well.
Claims (5)
1. high precision peak detecting device; It is characterized in that: comprise the operational amplifier U1, diode D2 and the operational amplifier U2 that connect successively; The output terminal of said operational amplifier U1 is connected with the negative pole of diode D2; The positive pole of diode D2 is connected with the positive input terminal of operational amplifier U2; Be connected with the resistance R 1 and capacitor C 2 of connecting between the positive input terminal of said operational amplifier U2 and the earth terminal; Be connected with resistance R 3 between the negative input end of the negative input end of said operational amplifier U1 and operational amplifier U2, be connected with capacitor C 1 between the input end of the input end of said resistance R 3 and diode D2, and the negative input end of operational amplifier U2 also is connected with the output terminal of operational amplifier U2.
2. a kind of high precision peak detecting device according to claim 1 is characterized in that: be connected with diode D1 between the negative pole of the negative input end of said operational amplifier U1 and diode D2, and the positive pole of diode D1 is connected with the negative pole of diode D2.
3. a kind of high precision peak detecting device according to claim 1 is characterized in that: also be connected with resistance R 2 between said operational amplifier U2 and the earth terminal, the resistance of said resistance R 2 is 10M Ω.
4. a kind of high precision peak detecting device according to claim 1 is characterized in that: the resistance of said resistance R 1 is 390 Ω, and the resistance of said resistance R 3 is 1.8k Ω.
5. a kind of high precision peak detecting device according to claim 1 is characterized in that: the capacitance of said capacitor C 1 is 1nF, and the capacitance of said capacitor C 2 is 10pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202095746U CN202533494U (en) | 2012-05-11 | 2012-05-11 | High-accuracy peak detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202095746U CN202533494U (en) | 2012-05-11 | 2012-05-11 | High-accuracy peak detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533494U true CN202533494U (en) | 2012-11-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202095746U Expired - Fee Related CN202533494U (en) | 2012-05-11 | 2012-05-11 | High-accuracy peak detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202533494U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389404A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | High-precision peak value detector |
| CN106771857A (en) * | 2016-12-05 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Cross-inked polyethylene power cable insulation defect characteristic gas detecting system |
| CN110068724A (en) * | 2018-01-24 | 2019-07-30 | 株式会社索思未来 | Peak value valley value detection circuit, A/D converter and integrated circuit |
-
2012
- 2012-05-11 CN CN2012202095746U patent/CN202533494U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389404A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | High-precision peak value detector |
| CN106771857A (en) * | 2016-12-05 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Cross-inked polyethylene power cable insulation defect characteristic gas detecting system |
| CN110068724A (en) * | 2018-01-24 | 2019-07-30 | 株式会社索思未来 | Peak value valley value detection circuit, A/D converter and integrated circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SICHUAN RUITENG ELECTRONICS CO., LTD. Assignor: Sichuan Youdi Science & Technology Co., Ltd. Contract record no.: 2012510000195 Denomination of utility model: High-precision peak value detector Granted publication date: 20121114 License type: Exclusive License Record date: 20121226 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20140511 |