Clamping is a process of introducing a/an

• A Clamper circuit can be defined as the circuit that consists of a diode, a resistor, and a capacitor that shifts the waveform to the desired DC level without changing the actual appearance of the applied signal.
• Clamping is the process of introducing a dc level into an signal. Clampers are also sometimes known as dc restorers. 
• In order to maintain the time period of the waveform, the time constant (RC) must be greater than half the time period (discharging time of the capacitor should be slow).

Depending upon the shifting, the clamper circuit is divided into two:

Positive Clamper:

Negative Clamper:

Important Points

Clippers:

• A clipper is a device consisting of diodes and resistors only, that removes either the positive half (top half) or negative half (bottom half), or both positive and negative halves of the input AC signal.
• The clipping (removal) of the input AC signal is done in such a way that the remaining part of the input AC signal will not be distorted
• In the below circuit diagram, the positive half cycles are removed by using the series positive clipper.

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