Question

The mid-band gain of an amplifier is measured when

• A. All capacitors act as open circuits
• B. All capacitors act as short circuits
• C. Input signal is zero
• D. Load is removed

Hint:

Frequency regions of an amplifier: \[ \boxed{ \begin{aligned} \text{Low frequency} &\rightarrow \text{Coupling capacitors affect gain} \text{Mid frequency} &\rightarrow \text{Capacitors behave as short circuits} \text{High frequency} &\rightarrow \text{Junction capacitances dominate} \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall the characteristics of the mid-band region. In the mid-frequency region, - coupling capacitors offer negligible reactance, - bypass capacitors also behave as short circuits, - transistor junction capacitances are neglected.

Step 2: Identify the correct condition. Thus, during mid-band gain measurement, \[ \boxed{\text{All coupling and bypass capacitors act as short circuits}.} \] Hence, \[ \boxed{(B)} \] is the correct answer.