Simple-Adjustment Type High Input Impedance Double-Wave Linear Detection (CR4558DN) Circuit Diagram

Published:2011/7/1 23:57:00 Author:Vicky | Keyword: Simple-Adjustment, High Input Impedance Double-Wave Linear | From:SeekIC

The above picture is a simple-adjustment type high input impedance double-wave linear detection circuit. In the positive semi-circle of output AC signal, the output of A1 is positive, and forward biased D1 is conducted, and therefore both the input and output of A2 are positive. Use R2, VR1,and R1 to perform reverse feedback of β=1 towards A1, that is to say, to change A to be non-inverting amplifier with gain of 1 . Under such circumstance, the gain remains unchanged when modulate VR1. In the positive semi-circle of the output signal, the output of A1 is negative, D1 is reverse biased, the output of A2 is 0, and therefore A2 becomes inverting amplifier. A1 conducts reverse feedback via D2. In fact, A1 becomes voltage follower. The reverse output of A2 is identical with AC input voltage, and A2 works as a invert amplifier with gain of 1. Under such circumstance, the gain of A2 can be changed by modulating VR1. Modulate VR1 to ensure that the whole gain is 1.



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