OP AMP CLAMPING CIRCUIT

In clamper circuits a predetermined dc level is added to the output voltage. In other words, the output is clamped to a desired dc level. If the clamped dc level is Positive, the clamper is a POSITIVE CLAMPER. On the other hand, if the clamped dc level is negative, the clamper is called a NEGATIVE CLAMPER. Other equivalent terms used for clamper are dc inserter or restorer. Recall that op amps are designed to operate from a single power supply, such as the 124 series, employ a dc insertion technique. The inverting operational amplifier (op amp) that use this technique is shown in the circuit diagram.

The value of the capacitors in these circuits depends on the different input rates and pulse widths. It is also noticed that the output waveforms have an added dc level, which is approximately equal to Vcc/2. This fixed positive dc level is needed to obtain a maximum undistorted symmetrical sine wave. The output voltage of the peak clamper is a net result of ac and dc input voltages applied to the -ve and +ve input terminals, respectively. Therefore, to understand the circuit operation, each input must be considered separately.

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