It is only needed that the switch be closed for a period long enough to allow the capacitor C to acquire or lose enough charge to bring the output terminal to the reference level VR.Let us consider an amplifier circuit in which fixed current bias is obtained by connecting a resistor RB from the base to the supply voltage as shown in Fig 8. low -frequency time constant is not very large in comparison with the time interval T1, signal will distort as shown in Fig, 6 (b).

The maximum voltage on the

The circuit diagram of a positive clamper is shown in the following figure − The output signal changes according to the changes in the input, but shifts the level according to the charge on the capacitor, as it adds the input voltage.A Negative clamper circuit if biased with some positive reference voltage, that voltage will be added to the output to raise the clamped level.

Actually, the positive and negative peaks of the signals can be placed at desired levels using the clamping circuits.

fed to the clamper circuit. Thus a clamping circuit is also known as D.C restorer, or D.C reinserted or a baseline stabilizer. These changes make the output voltage as shown in the above figure.A Negative Clamper circuit is one that consists of a diode, a resistor and a capacitor and that shifts the output signal to the negative portion of the input signal.

During the negative half cycle, at the peak value, the capacitor gets charged with negative on one plate and positive on the other. During the negative half-cycle, the diode conducts when the cathode voltage gets less than the anode voltage. As the DC level gets shifted, a clamper circuit is called as a Clamper circuits consist of energy storage elements like capacitors. The circuit of the positive clamper is similar to the negative clamper but the direction of the diode is inverted in such a way that the cathode of the diode is connected to the capacitor. Since this is a negative clamper (cathode to ground), the top of the output wave touch the +10V reference line.Similarly it is possible to clamp the input waveform negatively at by reversing the battery connections as shown in Fig 5(b)Clamping circuit discussed above are example of clamping circuit in which the time during which the clamping is effective is controlled by the signal itself is called non synchronous or Asynchronous On the other hand, When the time of clamping is not determined directly by the signal but is determined rather by an auxiliary voltage. Actually, the positive and negative peaks of the signals can be placed at desired levels using the clamping circuits. Thus the waveform is clamped towards the negative portion.There are many applications for both Clippers and Clampers such as Using this, the circuit of the positive clamper with positive reference voltage is constructed as below.During the positive half cycle, the reference voltage is applied through the diode at the output and as the input voltage increases, the cathode voltage of the diode increase with respect to the anode voltage and hence it stops conducting.

A circuit that places either the positive or negative peak of a signal at a desired D.C level is known as a clamping circuit. It means that, when the diode points upward. The output of the circuit at this moment will beHence the signal is negatively clamped as shown in the above figure. During the negative half cycle, the diode gets reverse biased and gets open circuited. Negetive Clamping Circuit .

This is the cheapest circuit to protect the switching system. Positive Clamper; Negative Clamper; This section discusses about these two types of clampers in detail. The output waveform is clamped to +10V, the value of the battery. The construction of the clamper circuit is almost similar to the clipper circuit. The voltage across the capacitor and the reference voltage together maintain the output voltage level.A Positive clamper circuit if biased with some negative reference voltage, that voltage will be added to the output to raise the clamped level.

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