To understand the operation of a half-wave rectifier, let us assume that the op amp and diode theoretically have no forward voltage. For a positive input voltage, the output will try to go negative. This turns D2 on and D1 off. Assuming D2 is shorted, the result will be that the output remains at ground potential because the op amp\'s behavior forces the op amp\'s input voltage to remain at the same level. For a negative input voltage, the output will go positive, with D1 turned on and D2 turned off. At this point, the output acts as an inverting amplifier (see MT-213) with a gain set by R2/R1. The result is that the output is 0V on the positive half-cycle after the negative half-cycle of the input (inverted).
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