Clipper Circuit 1:

The circuit shown in the figure 1, clips input signal above the reference voltage (V_R).

In this clipper circuit,

If  v_i   <  V_R,  diode  is  reversed  biased  and  does  not conduct. Therefore, v_o = v_i

and,   if v_i > V_R, diode is forward biased and thus, v_o= V_R.

The transfer characteristic of the clippers is shown in figure 2.

Figure 2

Clipper Circuit 2:

The clipper circuit shown in the figure 3 clips the input signal below the reference voltage V_R.

In this clipper circuit,

If v_i > V_R, diode is reverse biased. v_o = v_i

and,    If v_i < V_R, diode is forward biased. v_o = V_R

The transfer characteristic of circuit is shown in the figure 4

Figure 4

Clipper Circuit 3:

To clip the input signal between two independent levels

(V_R1< V_R2 ), the clipper circuit is shown in  figure 5. The diodes D₁ & D₂ are supposed to be ideal diodes. For this clipper circuit, when v_i ≤ V_R1, v_o=V_R1 and, v_i ≥ V_R2, v_o= V_R2

and, V_R1 < v_i < V_R2   v_o = v_i

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

Figure 6

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