Question

In saturation region, the depletion layer_________

(a) increases linearly with carrier concentration

(b) decreases linearly with carrier concentration

(c) increases by increasing the emitter current

(d) decreases by decreasing the emitter voltage drop

I have been asked this question in unit test.

My doubt is from Transistor as a Switch topic in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Right option is (d) decreases by decreasing the emitter voltage drop

Best explanation: Here, the transistor will be biased so that maximum amount of base current is applied, resulting in maximum collector current resulting in minimum emitter voltage drop which results in depletion layer as small as possible and maximum current flows through the transistor.