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Q.

A transistor with $α = 0.98$ is operated in common emitter configuration with a load resistance of $5 kΩ$ If the dynamic resistance of the base emitter junction is $70 Ω .$ The voltage gain and power gain will be

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a

$3500, 1.715 \times 10^{5}$

b

$2500, 1.215 \times 10^{5}$

c

$4000, 2.715 \times 10^{15}$

d

$2000, 2.715 \times 10^{15}$

answer is A.

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Detailed Solution

$a) α = 0.98$

$β = \frac{α}{1 - α} = \frac{0.98}{1 - 0.98} = 49$

$b) R_{load} (output) = 5000 Ω$

$R_{e-b} junction(input) = 70 Ω$

$V_{gain} = β \frac{R_{output}}{R_{input}} = 49 (\frac{5000}{70}) = 3500$

$P_{gain} = β (V_{gain})$

$= 49 (3500)$

$= 1.715 \times 10^{5}$

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A transistor with α=0.98 is operated in common emitter configuration with a load resistance of 5kΩ If the dynamic resistance of the base emitter junction is 70Ω. The voltage gain and power gain will be