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
![1001_clippers1.png](https://www.expertsmind.com/CMSImages/1001_clippers1.png)
Figure 2
When vi < (VR+ Vr), diode D is reverse biased and thus, vo= vi.
and when vi > ( VR + Vr ), 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
![1844_clippers6.png](https://www.expertsmind.com/CMSImages/1844_clippers6.png)
![1649_clippers2.png](https://www.expertsmind.com/CMSImages/1649_clippers2.png)
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 (VR).
If vi > (VR - Vr), diode D is reverse biased, thus vO = vi and when vi < (vR -Vr), D condcuts and the equivalent circuit becomes as shown in figure 5.
![1600_clippers3.png](https://www.expertsmind.com/CMSImages/1600_clippers3.png)
Figure 4
![517_clippers4.png](https://www.expertsmind.com/CMSImages/517_clippers4.png)
Figure 5
Thus,
![1220_clippers7.png](https://www.expertsmind.com/CMSImages/1220_clippers7.png)
The transfer the characteristic of circuit is shown in figure 6.
![1391_clippers5.png](https://www.expertsmind.com/CMSImages/1391_clippers5.png)
Figure 6
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