Digital Electronics - Signals and Switches - Discussion

When 5v will flow from through the D1 then at the node point the voltage will be 5v which is greater than the 0v and as a result the D2 will be in reverse condition. So D1 is in forward bias and D2 is in reverse bias.

Hi all, well tel us 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).

They not mention the condition of output voltage so we not able to predict the condition of input diodes D1 and D2.

First the d1 will be in forward bias, and the output is 5v, and the second d2 forced to be revere bias.