Note that the peak to peak excursion remains at 2V Positive unbiased A bias voltage between the diode and ground offsets the output voltage by that amount.įor example, an input signal of peak value 5 V (V INpeak = 5 V) is applied to a positive clamp with a bias of 3 V (V BIAS = 3 V), the peak output voltage will be: V OUTpeak = 2 × V INpeak + V BIAS V OUTpeak = 2 × 5 V + 3 V V OUTpeak = 13 V

A negative clamp is the opposite of this-this clamp outputs a purely negative waveform from an input signal. A positive clamp circuit(negative peak clamper) outputs a purely positive waveform from an input signal it offsets the input signal so that all of the waveform is greater than 0 V. Types Ĭlamp circuits are categorised by their operation negative or positive, and biased or unbiased. The magnitude of R and C must be chosen such that the time constant RC is large enough to ensure that the voltage across the capacitor does not discharge significantly during the interval the diode is nonconducting. The network must have a capacitor, a diode, and a resistive element, but it can also employ an independent dc supply to introduce an additional shift.

The clamping network is one that will 'clamp' a signal to a different dc level. These circuits clamp a peak of a waveform to a specific DC level compared with a capacitively-coupled signal, which swings about its average DC level. 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.

Rangkaian clipper dengan dioda zener