An absolute value circuit as as a full wave rectifier. Positive input voltqges cause the first amplifier to act as a unity gain inverter. The second amplifier inverts thiis output again to produce a positive outut voltage. Negative input voltages cause the + input of the second amplifier to move positive to a voltage of 2/3Vin. This is multiplied by a gain of 3/2 by the second amplifier also producing a positive output voltage equal to the input voltage.
Tools & Simulations
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