we use diodes along the resistors and capacitors to shape waveforms
if we want to clip the portion of the wave form we use clippers
if we want to shift or clamp the dc voltage level we use clampers
clippers are networks that use diodes to clip a portion of input signal without distorting the remaining part of the waveform
a clamper is a network constructed of a diode, a resistor, and a capacitor that shifts the waveform to a different dc level without changing the appearance of applied signal