Example - 1:
Calculate the voltage output of the circuit shown in fig. 5 for following inputs
(a) V1 = V2 = 0.
(b) V1 = V, V2 = 0.
(c) V 1 = V2 = V knew voltage = Vr
Forward resistance of each diode is Rf.
Fig. 5
Solution:
(a). When both V1 and V2 are zero , then the diodes are unbiased. Therefore,
Vo = 0 V
(b). When V1 = V and V2 = 0, then one upper diode is forward biased and lower diode is unbiased. The resultant circuit using third approximation of diode will be as shown in fig. 6.
Fig. 6 Fig. 7 Applying KVL, we get
(c) When both V1 and V2 are same as V, then both the diodes are forward biased and conduct. The resultant circuit using third approximation of diode will be as shown in Fig. 7.
