Clipping circuits select that part of the signal which lies above and below a reference level. Depending on whether the diode is connected in series with the load or in shunt with the load, these circuits are called either series-clipping circuits or shunt-clipping circuits.
FIGURE 4.7(a) Series clipper that clips the negative half-cycles
FIGURE 4.7(b) The transfer characteristic, input waveform and output waveform of a series clipper that clips negative half-cycles
Consider the series-clipping circuit ...