![]() When unbiased, clamping circuits will fix the voltage lower limit (or upper limit, in the case of negative clampers) to 0 volts. Clampers can be constructed in both positive and negative polarities. These circuits are also known as DC voltage restorers. ![]() The capacitor forms a time constant with the resistor load, which determines the range of frequencies over which the clamper will be effective.Ī clamping circuit (also known as a clamper) will bind the upper or lower extreme of a waveform to a fixed DC voltage level. A diode clamp (a simple, common type) consists of a diode, which conducts electric current in only one direction and prevents the signal exceeding the reference value and a capacitor, which provides a DC offset from the stored charge. ![]() The clamper does not restrict the peak-to-peak excursion of the signal, it moves the whole signal up or down so as to place the peaks at the reference level. Ī clamper is an electronic circuit that fixes either the positive or the negative peak excursions of a signal to a defined value by shifting its DC value. Note that the negative swing of the output will not dip below about −0.6 V, assuming a silicon pn diode. Positive unbiased voltage clamping vertically translates the input waveform so that all parts of it are approximately greater than 0 V.
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