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?
- 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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Similar Questions
Consider an amplifier circuit in which a transistor is used in common-emitter mode. The load resistance is $3 k \Omega$. When a signal of $30 mV$ is added to the base-emitter voltage, the base current changes by $30 \mu A$ and the collector current changes by $3 mA$. The power gain in this circuit will be:
Assertion : In a common emitter transistor amplifier,the input current is much less than the output current.
Reason : The common emitter transistor amplifier has very high input impedance.
Reason : The common emitter transistor amplifier has very high input impedance.
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:
Medium
View Solution$A$ transistor is used as an amplifier in $CB$ mode with a load resistance of $5 \, k\Omega$. The current gain of the amplifier is $0.98$ and the input resistance is $70 \, \Omega$. The voltage gain and power gain respectively are:
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View Solution$A$ transistor works as an amplifier when
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