Signals and Switches

Determine if diodes D1 and D2 in the given figure are forward or reverse biased.

A D1 and D2 reverse

B D1 and D2 forward

C D1 forward and D2 reverse

D D2 forward and D1 reverse

ANS:A - D1 forward and D2 reverse

 consider at time T0: voltage V out is undefined. If we assume that voltage to be less than the anode vg of the diode D1 then and then only it is said to forward biased. Same thing to the diode D2 and hence anode voltage at D2 is 0v and hence which is less than the previous assumption the it is reverse biased. (if you assume in opposite way then both of the diodes are reverse biased).

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