2.1) Half-Wave Rectifier and Summing CircuitCircuit Operation
During the positive half-cycle of the input, the voltage at terminal A is +Vi, while that at terminal B is -2Vi.
The output from the summing circuit with R5 = R4 is
During the negative half-cycle of the input, VA =-Vi, and VB=0.
Consequently, the output is
It is seen that the output is a full-wave rectified version of the input voltage.
If resistor R6 equals R4 and R5, the circuit has an overall voltage gain of 1.
When R6 is greater than R4 and R5, amplification and rectification both occur.
A precision full-wave rectifier circuit is also known as an absolute value circuit.