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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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5.3 THE EFFECT OF DIODE CHARACTERISTICS ON THE CLAMPING VOLTAGE

For the clamping circuit shown in Fig. 5.7, to obtain the steady-state response, the diode is replaced by Rf when ON and Rr = ∞ when OFF. Though the positive peak of the signal in the output is ideally required to be clamped to the zero level, in practice it is clamped to a voltage Vcl = Vγ, where Vγ is the cut-in voltage of the diode. In a practical diode, the current variation is non-linear in nature. Hence, we consider the influence of the diode characteristics on the clamping voltage, Vcl and show that the clamping voltage (Vcl) changes with a change in the amplitude of the input signal. Let us consider the clamping circuit described in Fig. 5.7 and let its input be a symmetric ...

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