Question

The input characteristics of a transistor in $CE$ mode is the graph obtained by plotting

• A. $I_B$ against $V_{BE}$ at constant $V_{CE}$
• B. $I_B$ against $V_{CE}$ at constant $V_{BE}$
• C. $I_B$ against $I_C$ at constant $V_{CE}$
• D. $I_B$ against $I_C$ at constant $V_{BE}$

Answer 1

Answer: (A)

Input characteristics curve is drawn between base current $I_B$ and emitter base voltage $V_{RB}$ at constant collector emitter voltage $V_{CB}$ Dynamic input resistance,
$R_i={\left(\frac{\Delta V_{BE}}{\Delta I_B}\right)}_{V_{CE}}=\text{ constant }$