Question

In a common base amplifier, the load resistance of the output circuit is $1000$ times the resistance of the input circuit. If $\alpha =$ $0.98$, then the voltage gain is

• A. $98000$
• B. $49000$
• C. $980$
• D. $490$

Answer 1

The correct option is C $980$

Given that:
$\alpha$ = $0.98$
$R_L=1000R_i$
Hence, resistance gain is
$\frac{R_L}{R_i}=\frac{1000R_i}{R_i}=1000$

Voltage gain = $\alpha \times$ Resistance gain
Voltage gain = $0.98$ $\times$ $1000=980$.