Pulse and Digital Circuits

5.5 THE CLAMPING CIRCUIT THEOREM

This theorem enables us to calculate the voltage level to which the output is clamped by considering the areas above and below the reference level, when the values of R_f and R are known.

The clamping circuit theorem states that under steady-state conditions, for any input waveform, the ratio of the area under the output voltage curve in the forward direction to that in the reverse direction is equal to the ratio R_f/R. To prove the clamping circuit theorem, consider a typical steady-state output for the clamping circuit, represented in Fig. 5.31.

In the time interval t₁ to t₂, D is ON. Hence, during this period, the charge builds up on the capacitor C. If i_f is the diode current, the charge gained by the capacitor ...