Certain applications in electronics require that the upper or
lower extremity of a wave be fixed at a specific value In such
applications ,a clamping/clamper circuits are used. A circuit
that places either the positive or negative peak of a signal at
a desired D.C level is known as a clamping circuit. A clamping
circuit introduces (or restores) a D.C level to an A.C signal.
Thus a clamping circuit is also known as D.C restorer, or D.C
reinserted or a baseline stabilizer. The following are two
general types of clamping. - Positive clamping occurs when
negative peaks raised or clamped to ground or on the zero level
In other words, it pushes the signal upwards so that negative
peaks fall on the zero level. - Negative clamping occurs when
positive peaks raised or clamped to ground or on the zero level
In other words, it pushes the signal downwards so that the
positive peaks fall on the zero level. In both cases the shape
of the original signal has not changed, only there is vertical
shift in the signal Fig. 1 sho