Question

Why do we need CE short circuit gain obtained with hybrid pi model?

(a) To provide a non – linear output

(b) To maintain transistor in active region

(c) To maintain transistor in saturation region

(d) To maintain transistor in cut – off region

I got this question in a national level competition.

The doubt is from The CE Short Circuit Gain Obtained with the Hybrid PI Model in division High Frequency Transistor of Electronic Devices & Circuits

Answer 1

Right choice is (b) To maintain transistor in active region

For explanation I would say: We use a CE short circuit gain obtained with hybrid pi model to collect negative feedback and to maintain the transistor in an active region. To maintain stability in active region, the DC base biased voltage is resultant from the collector voltage VC .