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  • The full wave rectifier.

  • Created: Jul 21, 2014

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It is most convenient to analyze its function by considering separately what happens for Vin > 0 and Vin < 0. Figure 2a shows the equivalent circuit for Vin > 0. In this case the diode D1 is reversed biased and effectively an open circuit, D2 is conducting. The feedback loop is effectively a single resistor, from the output of OA2 to the negative input of OA1. OA1 and OA2 act together as a single op-amp and the complete circuit acts like a simple voltage follower, Vout = Vin. There is a complication with this circuit. At sufficiently high frequency, both OA1 and OA2 introduce 90º phase shifts, which together with the 180º shift achieved by feeding the signal back to the “–“ input of OA1, would make the circuit unstable. A small capacitor, C, is used to counteract this.



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