Clippers:

In the clipper circuits, discussed so far, diodes are supposed as ideal device. If third approximation circuit of diode is used, the transfer characteristics of the clipper circuits will be modified.

Clipper Circuit 4:

Consider clipper circuit shown in figure 1 to clip input signal above reference voltage

Figure 1 

                                    Figure 2

When v_i < (V_R+ V_r), diode D is reverse biased and thus, v_o= v_i.

and when v_i > ( V_R + V_r ), diode D is forward biased and conducts. The equivalent circuit, in this case is shown in the figure 2.

The current i in the circuit is given by

Figure 3

The  transfer  characteristic  of  the  circuit  is shown in figure 3.                                                

Clipper Circuit 5:

Consider the clipper circuit shown in figure 4, which clips the input signal below the reference level (V_R).

If v_i > (V_R - V_r), diode D is reverse biased, thus v_O = v_i and when v_i < (v_R -V_r), D condcuts and the equivalent circuit becomes as shown in figure 5.

Figure  4  

                    Figure 5

Thus,

The transfer the characteristic of circuit is shown in figure 6.

Figure 6

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