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  4. In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be :

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Q. In a common emitter $(CE)$ amplifier having a voltage gain $G$, the transistor used has transconductance $0.03 \,mho$ and current gain $25$. If the above transistor is replaced with another one with transconductance $0.02$ $mho$ and current gain $20$, the voltage gain will be :

NEETNEET 2013Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Voltage gain ${A_v = \frac{\Delta V_c}{\Delta V_B}} = \frac{R_L\Delta I_c}{\Delta V_B} = g_mR_L$
$\frac{A_{V1}}{A_{v2}} = \frac{g_{m1}}{g_{m2}}\Rightarrow \frac{G}{A_{v2}} = \frac{0.03}{0.02}\Rightarrow A_{v2} = \frac{2}{3}G $