# Dual wave linear detector circuit

2017-03-02 13:27

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Dual wave linear detector circuit is shown as the chart. In the circuit, Ui is the AC input signal, and U is the rectifier output signal. In the positive half-cycle of AC input, A1's output is positive. As VD1 knife is positive bias, A2's input is positive, and its output is also positive, and it makes a feedback on A1 by R2, RPl and Rl, so A2 becomes a noninverting amplifier with the gain in 1; in the negative half-cycle of AC input, Al's output is also negative, and VD1 is anti-bias, then A2's inverting input is 0, that is, the working status of the inverting amplifier.

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