Question

We cannot use h-parameter model in high frequency analysis because ____________

(a) They all can be ignored for high frequencies

(b) Junction capacitances are not included in it

(c) Junction capacitances have to be included in it

(d) AC analysis is difficult for high frequency using it

The question was posed to me during an online interview.

The doubt is from High Frequency Response in division Transistor Frequency Response of Analog Circuits

Answer 1

The correct option is (b) Junction capacitances are not included in it

The explanation: The effect of smaller capacitors is considerable in high frequency analysis of analog circuits, and hence they cannot be ignored. Instead of h-parameter model, we use π-model.