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The diode doesn't conduct when it is reverse biased, so it is effectively not present for negative excursions of vo thus negative pulses are not clipped and they remain unaffected.M. next said:
A diode is a two-terminal electronic component that allows current to flow in only one direction. It is typically made of semiconductor materials, such as silicon or germanium, and is commonly used in electronic circuits to convert AC power to DC power.
Clippers in diodes are used to limit the maximum and minimum voltage levels of an electrical signal. They work by selectively conducting current in one direction and blocking it in the other direction, effectively "clipping" off the peaks of the signal above a certain threshold.
In a series clipper, the diode is connected in series with the signal source and the load, while in a shunt clipper, the diode is connected in parallel with the load. This difference in configuration affects the way the diode limits the voltage levels of the signal.
The current in a diode flows from the anode (positive terminal) to the cathode (negative terminal) when the diode is forward biased, meaning the anode is at a higher potential than the cathode. When the diode is reverse biased, current flow is minimal as the diode acts as an insulator.
Clippers in diodes are commonly used in electronic circuits to protect sensitive components from high voltage levels, to shape the waveform of signals, and to rectify AC power to DC power. They can also be used in audio and video processing to remove unwanted noise or distortion from signals.
