11.11 : Clipper Circuit

A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.

The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing battery and arranged in parallel to a resistor. The operation of the circuit depends on the phase of the input AC signal. During the positive half-cycle, when the input voltage is less than the battery voltage connected with diode A, it behaves like an open switch, allowing the applied voltage to pass unaltered.

The clipping action becomes apparent when the input voltage exceeds the biasing battery's voltage. Under such circumstances, diode A transitions to a forward-biased condition, effectively acting as a barrier to the input voltage. The output voltage gets clipped to a constant value equal to the biasing battery voltage and the diode B remains reverse-biased.

In the negative, diode B performs the clipping role. The resultant output voltage is constrained by the biasing voltage of diode B. The selection of the resistor value is critical, aiming to strike a balance that ensures sufficient forward current for the diode while minimizing the impact of voltage drop due to reverse current flow. Through such mechanisms, clipper circuits provide a robust tool for waveform manipulation, enhancing the performance and efficiency of electronic systems.