Question 168: Semiconductors and Logic Gates

Question

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter
transistor configuration is :

Accepted Answer

For common emitter configuration, the input characteristic graph is shown above,
r
i
$$=$$  $${{\Delta {V_{BE}}} \over {\Delta {{\rm I}_B}}}$$
$$ \Rightarrow $$   $${1 \over {{r_i}}} = {{d{{\rm I}_B}} \over {d{V_{BE}}}}$$ $$=$$ shope of this curve.
Upto knee voltage 0.7 V the shope is almost constant. Then it increases sharply.
So, option (c) is the correct choice.

Answer

Answer

Answer

Answer

Semiconductors and Logic Gates

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter transistor configuration is :

Choose the correct answer: