Two-Output Precision Half-Wave Rectifier Circuit Operation
During the positive half-cycle of the input, the op-amp output terminal goes negative, causing D1 to be forward-biased, and D2 to be reversed.
In this situation, the op-amp together with resistors R1 and R4 functions as an inverting amplifier to give an output at terminal B
No current flows in resistor R2 at this time because D2 is reverse-biased.
Also, R2 is connected to the virtual ground at the op-amp inverting input terminal.
So, the output at point A remains at ground level for the duration of the positive half-cycle of the input.
Negative Input
When the input is in its negative half-cycle, the op-amp output goes positive, D1 is reverse-biased, and D2 is forward-biased.
Now resistors R1 and R2 combine with the op-amp to perform as an inverting amplifier.
The output at terminal A is
Negative Input
With D1 reversed, no current flows in resistor R4; and with R4 connected to the virtual ground at the op-amp inverting input, the output terminal B is zero.
The circuit in Fig.7-3 is seen to be a precision rectifier with positive half-cycles of output at terminal A, and negative half-cycles at terminal B.
Two-Output Precision Half-Wave Rectifier Circuit OperationDuring the positive half-cycle of the input, the op-amp output terminal goes negative, causing D1 to be forward-biased, and D2 to be reversed. In this situation, the op-amp together with resistors R1 and R4 functions as an inverting amplifier to give an output at terminal B No current flows in resistor R2 at this time because D2 is reverse-biased. Also, R2 is connected to the virtual ground at the op-amp inverting input terminal. So, the output at point A remains at ground level for the duration of the positive half-cycle of the input.Negative Input When the input is in its negative half-cycle, the op-amp output goes positive, D1 is reverse-biased, and D2 is forward-biased. Now resistors R1 and R2 combine with the op-amp to perform as an inverting amplifier. The output at terminal A is Negative Input With D1 reversed, no current flows in resistor R4; and with R4 connected to the virtual ground at the op-amp inverting input, the output terminal B is zero.The circuit in Fig.7-3 is seen to be a precision rectifier with positive half-cycles of output at terminal A, and negative half-cycles at terminal B.
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