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High-precision peak value detector

A detector, high-precision technology, applied in the direction of AC/pulse peak measurement, etc., can solve the problems of large delay and low detection accuracy, and achieve the effect of reducing output overshoot and improving detection accuracy

Inactive Publication Date: 2013-11-13
SICHUAN UD TECH
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Problems solved by technology

[0004] The present invention provides a high-precision peak detector, which solves the problems of large delay and low detection accuracy in the detection process of the previous peak detector

Method used

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Embodiment

[0016] Such as figure 1 As shown, the present invention includes operational amplifier U1, diode D2 and operational amplifier U2 connected in sequence, the output terminal of operational amplifier U1 is connected with the cathode of diode D2, the positive pole of diode D2 is connected with the positive input end of operational amplifier U2, operational amplifier U2 The negative input terminal of is also connected with the output terminal of operational amplifier U2.

[0017] In this embodiment, a resistor R1 and a capacitor C2 are connected in series between the positive input terminal of the operational amplifier U2 and the ground terminal. The resistance value of the resistor R1 is 390Ω, and the capacitance value of the capacitor C2 is 10pF. R1 and C2 are used to further suppress the holding overshoot during transients between cycle and charge cycles as they limit the phase shift and attenuation of the feedback loop at high frequencies.

[0018] In this embodiment, a resist...

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Abstract

The invention discloses a high-precision peak value detector. The high-precision peak value detector comprises an operational amplifier U1, a diode D2 and an operational amplifier U2 which are sequentially connected. The output end of the operational amplifier U1 is connected with the negative electrode of the diode D2, the positive electrode of the diode D2 is connected with the 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 of the operational amplifier U2 and the ground terminal, a resistor R3 is connected between the negative input end of the operational amplifier U1 and the negative input end of the operational amplifier U2, a capacitor C1 is connected between the input end of the resistor R3 and the input end of the diode D2, and the negative input end of the operational amplifier U2 is connected with the output end of the operational amplifier U2. By means of the structure, the delay of the peak value detector is small, and the detection precision is high in the process of detecting.

Description

technical field [0001] The invention relates to a peak detector, in particular to a high-precision peak detector. Background technique [0002] The basic circuit structure of the peak detector is mainly composed of sampling, holding circuit and voltage comparison circuit. The simplest peak detection circuit is a charging and discharging circuit composed of a diode and a capacitor. The detection circuit is formed by using the unidirectional conductivity of the diode and the storage function of the capacitor. The switching diode is used as a comparison circuit, and the capacitor memory is used as a holding circuit. The basic principle of peak detection is: when the voltage Vin of the input signal increases, the peak detection circuit performs sampling, and makes the output voltage Vout follow the input voltage Vin well; when the input voltage Vin starts to decrease, the circuit enters the hold phase, Keep the peak voltage at the moment and output it. When the input voltage Vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04
Inventor 林锋
Owner SICHUAN UD TECH
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