The peak value detection circuit composed of FET

Published:2011/7/14 1:09:00 Author:Borg | Keyword: peak value, FET | From:SeekIC

The circuit consists of the forward/negative peak value circuit and difference amplifier. A1 keeps the forward voltage at the max value, the voltage is represented at point a. A2 keeps the backward voltage at the max value, the voltage is represented at point b. A3 is the difference amplifier whose gain is 1, it can amplifier the voltage Ua at point a and Ub at spot b, by which the forward/backward peak value of the input voltage Ui can be got. The maintenance time of the circuit is decided by the grid current leakage of C1 or C2, VD1 or VD2, VT1 or VT2.



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