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{| {|style="border:2px solid #8e6e1a;" !style="background:#e3c57b;"|Clamper (electronics) A clamper is an electric circuit that prevents a signal from exceeding a certain defined magnitude by shifting its DC value. A diode clamp relies on a diode, which conducts electric current in only one direction; resistors and capacitors in the circuit can be used to alter the dc level at the clamper output.
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Types
Clamp circuits are categorised by their operation; negative or positive and biased and unbiased. A positive clamp circuit outputs a purely positive waveform from an input signal; it offsets the input signal so that all of the waveform is greater than 0V. A negative clamp is the opposite of this - this clamp outputs a purely negative waveform from an input signal.

A bias voltage between the diode and ground offsets the output voltage by that amount.

For example, an input signal of peak value 5V (VIN = 5V) is applied to a positive clamp with a bias of 3V (VBIAS = 3V), the peak output voltage will be
 * VOUT = 2VIN + VBIAS
 * VOUT = 2 * 5 + 3
 * VOUT = 13V

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