The diodes in forward bias, have drops of 0.3V for Ge and 0.7V for Si, and the total drops cancel out the source voltage, and hence the diode current is zero. Hence voltage drop is also zero.

As the silicon diode in the circuit is reverse biased, hence the current in the circuit is zero.

The diodes in forward bias, have drops of 0.3V for Ge and 0.7V for Si, and the total drops cancel out the source voltage, and hence the diode current is zero.

ID = (V-VD)/R = 4.3 mA.

The diodes have a drop of 0.3V for Ge and 0.7V for Silicon in forward bias. We can use the constant voltage model, and hence in forward bias, the current flowing is

Piecewise linear model involves a line with a slope equal to 1/Rav. As Rav is low, 1/ Rav is high and the slope becomes almost equal to infinity and hence, it approaches the equivalent circuit model and hence, the piecewise linear model isn’t generally used.

Here, current I=10-0.7/4k=2.325 mA

Approximate Equivalent model not only saves time and efforts but also provides results with a considerable amount of accuracy.

As both the diodes are reverse biased, the current in the circuit is zero.

Here, ID=(V-VD)/R = 2.325 mA.