A clamping circuit, also known as a DC restorer or a level shifter, is an electronic circuit that shifts the DC level of an input signal to a different DC level, while leaving the AC signal unchanged. The purpose of a clamping circuit is to add a DC component to a signal or to remove any DC component present in the input signal.
A clamping circuit typically consists of a capacitor, a diode, and a resistor. The capacitor is used to couple the input signal to the circuit, while the diode is used to clamp the output voltage to a certain level. The resistor is used to limit the current flowing through the diode.
The clamping circuit is commonly used in electronic circuits to shift the DC level of a signal to match the operating range of other electronic devices in the circuit. For example, in audio amplifiers, a clamping circuit can be used to remove any DC component from the input signal to prevent damage to the speakers. Similarly, in video circuits, a clamping circuit can be used to remove any DC offset from the video signal to prevent distortion in the displayed image.
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