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Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE) PDF Download

Q1: For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is (2022)
(a) 0
(b) 1
(c) 100
(d) infinite
Ans:
(d)
Sol: For ideal MOSFET, iG = 0
Therefore, Current gain, A= is/i= ∞

Q2: The magnitude of the mid-band voltage gain of the circuit shown in figure is (assuming hfe of the transistor to be 100) (SET-1 (2014))
Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)(a) 1
(b) 10
(c) 20
(d) 100
Ans:
(d)
Sol: AC model,
Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)Zi = 10kΩ
Mid band voltage gain Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)

Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)∣Av∣ = 100  


Q3: In the single-stage transistor amplifier circuit shown in figure, the capacitor CE is removed. Then, the ac small-signal midband voltage gain of the amplifier (2001)
Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)(a) increases
(b) decreases
(c) is unaffected
(d) drops to zero
Ans:
(b)
Sol: Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE)⇒ AV2 < AV1
The document Previous Year Questions- Small Signal Analysis | Analog and Digital Electronics - Electrical Engineering (EE) is a part of the Electrical Engineering (EE) Course Analog and Digital Electronics.
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