(A) In a common emitter transistor amplifier:$1$. The voltage gain $A_V$ is defined as the ratio of the output voltage to the input voltage.$A_V = \fr

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$\beta (R_L/r_i), \beta^2 (R_L/r_i)$

(A) In a common emitter transistor amplifier:$1$. The voltage gain $A_V$ is defined as the ratio of the output voltage to the input voltage.$A_V = \frac{V_{out}}{V_{in}} = \frac{I_c R_L}{I_b r_i} = \beta \frac{R_L}{r_i}$, where $\beta = \frac{I_c}{I_b}$ is the a.c. current gain.$2$. The power gain $A_P$ is defined as the product of the current gain and the voltage gain.$A_P = \beta \times A_V = \beta \times (\beta \frac{R_L}{r_i}) = \beta^2 \frac{R_L}{r_i}$.Therefore, the voltage gain is $\beta (R_L/r_i)$ and the power gain is $\beta^2 (R_L/r_i)$.

Class 12 Physics Semiconductor Electronics Junction Transistor

Medium

In common emitter configuration of a transistor amplifier, $r_i$, $R_L$ and $\beta$ represent the input resistance, load resistance, and the a.c. current gain, respectively. The voltage gain $A_V$ and power gain $A_P$ are represented in magnitude by which of the following expressions?

MHT CET 2026 All MHT CET

A
$\beta (R_L/r_i), \beta^2 (R_L/r_i)$
B
$\beta (r_i/R_L), \beta^2 (r_i/R_L)$
C
$\beta^2 (R_L/r_i), \beta (R_L/r_i)$
D
$\beta (R_L/r_i), \beta (R_L/r_i)$

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In common emitter configuration of a transistor amplifier, $r_i$, $R_L$ and $\beta$ represent the input resistance, load resistance, and the a.c. current gain, respectively. The voltage gain $A_V$ and power gain $A_P$ are represented in magnitude by which of the following expressions?

Similar Questions

In a transistor amplifier, the base-emitter junction is forward-biased and the collector-base junction is reverse-biased. The current gain $(\beta)$ is defined as:

In an $n-p-n$ transistor,$200$ electrons enter the emitter in $10^{-8} \ s$. If $1 \%$ of electrons are lost in the base,then the current that enters the emitter and the current amplification factor are respectively $\left[e=1.6 \times 10^{-19} \ C\right]$

The current amplification factor of a transistor is $50$. In a $CE$ amplifier circuit, the collector resistance is $5 \, k\Omega$ and the input resistance is $1 \, k\Omega$. If the input voltage is $0.01 \, V$, the output voltage is ........ $V$.

In an $NPN$ transistor,$10^{10}$ electrons enter the emitter in $10^{-6} \ s$ and $2\%$ of the electrons recombine with holes in the base. The current gains $\alpha$ and $\beta$ are respectively:

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