Explore topic-wise MCQs in Analog Circuits.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.

1.

Neglecting Channel Length Modulation, if the transconductance of a MOSFET increases, the output impedance of the follower stage can _________

A. increase
B. decrease
C. increase linearly
D. decrease non-linearly
Answer» C. increase linearly
Discussion
2.

Neglecting Channel Length Modulation, if the transconductance increases, the input impedance of a follower stage ___________

A. Remans the same
B. Increases
C. Decreases
D. Doubles
Answer» B. Increases
Discussion
3.

Neglecting Channel Length Modulation, if the aspect ratio of the MOSFET increases, the gain of the follower stage will _________

A. increase
B. decrease
C. increases proportionately
D. doesn’t get affected
Answer» B. decrease
Discussion
4.

Neglecting Channel Length Modulation, if the transconductance of the MOSFET increases, the gain of the follower stage will _________

A. decreases
B. increases
C. doesn’t get affected
D. doubles
Answer» C. doesn’t get affected
Discussion
5.

If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if both M1 and M3 has channel length modulation?

A. R / ((1/g || r) + R) * g * R * R / ((1/gm || r))
B. R / ((1/g + 4R) * g * R / ((1/g || r) + 3R)
C. R / ((1/g || r)) * g *R * R / ((1/g || r) + 2R)
D. R / ((1/g) * R * R * g * 4g
Answer» B. R / ((1/g + 4R) * g * R / ((1/g || r) + 3R)
Discussion
6.

If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if both M2 and M3 has channel length modulation?

A. R/ ((1/g || r) + R) * g * (R || r) * R * g
B. R/ ((1/g + R) * g * (R || r) * R/ ((1/g || r) + R)
C. R/ ((1/g || r)) * g *R * R/ ((1/g || r) + R)
D. R/ ((1/g ) + R) * g *R * R *2g
Answer» C. R/ ((1/g || r)) * g *R * R/ ((1/g || r) + R)
Discussion
7.

If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if only M1 has channel length modulation?

A. R / ((1/g || r ) + R) * g *R * R / (1/g + R)
B. R / ((1/g || r ) + R) * g *R * R * g
C. R / ((1/g || r )) * g *R * R / (1/g + R)
D. R / ((1/g ) + R) * g *R * R / (1/g + R)
Answer» B. R / ((1/g || r ) + R) * g *R * R * g
Discussion
8.

If maximum power is transferred to the load R1, the transconductance is .02 and channel length modulation is neglected, what should be the value of the load?

A. 50 Ω
B. 32 Ω
C. 16 Ω
D. 10 Ω
Answer» B. 32 Ω
Discussion
9.

Assume µnCox = 100 µA/V2 and supply current is 5mA, what should be the aspect ratio so that a 50 Ω load can be used to give a voltage gain of .25 in C.D. configuration?

A. 32.6
B. 50
C. 40
D. 41
Answer» B. 50
Discussion
10.

The follower stage is mostly used as a ____________

A. Current source
B. Buffer stage
C. Amplifier
D. Switch
Answer» C. Amplifier
Discussion
11.

The output impedance of the follower is _____________

A. Low
B. Very low
C. Depends on it’s transconductance and low
D. High
Answer» D. High
Discussion
12.

The follower stage provides _____ input impedance.

A. low
B. equal
C. very high
D. very low
Answer» D. very low
Discussion
13.

If channel length modulation is present in M1 but not in M2, what is the voltage gain at node X?

A. (1/gm2 || ro2) / {1/gm2 + ( 1/gm1 || ro1)}
B. (1/gm1 || ro1) / (1/gm2 + ro1)
C. 1/gm1 / (1/gm2 + 1/gm1)
D. 1/gm1 / {1/gm2 + (1/gm1 || ro1)}
Answer» B. (1/gm1 || ro1) / (1/gm2 + ro1)
Discussion
14.

If channel length modulation is present, what is the impedance looking into node X?

A. (1/gm2 || ro2 || 1/gm1)
B. (1/gm2 || 1/gm1 || ro1)
C. (1/gm2 || ro2 || 12/gm1 || ro1)
D. (1/gm2 || ro2 || 1/gm1 || ro1)
Answer» E.
Discussion
15.

If channel length modulation is present, what is the voltage gain?

A. ro1 / {(1/gm1 || ro2) + ro1}
B. ro2 / (1/gm1 + ro1)
C. ro2 / (1/gm1 + 3ro2)
D. ro2 / (2/gm1 + ro2)
Answer» B. ro2 / (1/gm1 + ro1)
Discussion