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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
Options
(a) 1.5 G
(b) 1/3 G
(c) 5/4 G
(d) 2/3 G
Correct Answer:
2/3 G
Explanation:
Voltage gain ∆ᵥ = β Rₒᵤₜ / Rᵢₙ
G = 25 Rₒᵤₜ / Rᵢₙ ….(i)
Transconductance gₘ = β / Rᵢₙ
Rᵢₙ = β / gₘ = 25 / 0.03
Puttin g this value of Rᵢₙ in eqn.(i)
G = 25 Rₒᵤₜ / 25 x 0.03 …(ii)
G’ = 20 Rₒᵤₜ / 20 x 0.02 …(iii)
From eqs. (ii) and (iii)
Voltage gain of new transistor G’ = 2/3 G
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Topics: Electronic Devices
(124)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Under constant pressure, graph between P and 1/V is a
- A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
- If the force exerted by an electric dipole on a charge q at a distance of 1 m is F
- The magnetic susceptibility is negative for
- The drift velocity does not depend upon
Topics: Electronic Devices (124)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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