Q2GATE 2025MCQ

Which one of the following statement is true about the small signal voltage gain of a MOSFET based single stage amplifier?

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Q3GATE 2022MCQ

For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is

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📖 Explanation

For ideal MOSFET, $i_G=0$ Therefore, Current gain, $A_I=\frac{i_s}{i_G}=\infty$

Q4GATE 2014MCQ

The magnitude of the mid-band voltage gain of the circuit shown in figure is (assuming $h_{fe}$ of the transistor to be 100)

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📖 Explanation

AC model, $\; \; \; \; Z_{i}=10\, k\Omega$ Mid band voltage gain $\; \; \; \; A_{v}=\frac{A_{I}R_{L}}{Z_{i}}$ $\; \; \; \; A_{v}=\frac{-h_{fe}R_{L}}{Z_{i}} =\frac{-100\times 10\, k\Omega }{10\, k\Omega }=-100$ $\; \; \; \; \left | A_{v} \right |=100$

Q5GATE 2001MCQ

In the single-stage transistor amplifier circuit shown in figure, the capacitor $C_{E}$ is removed. Then, the ac small-signal midband voltage gain of the amplifier

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📖 Explanation

$\frac{A_{V_1}}{A_{V_1}}=1+\left ( \frac{1+h_{fe}}{h_{ie}} \right )R_{e}$ $\frac{A_{V_{1}}}{A_{V_{2}}}> 1$ $\Rightarrow \; A_{V_{2}} \lt A_{V_{1}}$

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