Question

In the circuit, considering the diode 1,4 to be a Germanium diode and the diodes 2,3 to be silicon, which of the following statements are true?

(a) ID1 = ID2

(b) ID1 = ID3

(c) ID1 = ID4

(d) ID1 > ID4

The question was posed to me by my college director while I was bunking the class.

My question is taken from Parallel and Series Configuration in section Diode Circuit of Analog Circuits

Answer 1

The correct choice is (c) ID1 = ID4

Explanation: In the given circuit, the silicon diodes are in off-state as the voltage across them is 0.3 V. Hence, they act as open circuit and the diodes 1 and 4 are in series and hence the current through diodes 1 and 4 is same.