Differential Amplifier in VLSI MCQ Quiz – Objective Question with Answer for Differential Amplifier in VLSI

11. In the MOSFET amplifier, the parameter that changes due to the changes in input is:

A. Small signal drain current
B. Large signal drain current
C. Voltage across substrate and source
D. None of the mentioned

Answer: A

Due to the transconductance, drain current changes as input changes.

12. Input impedance of MOSFET amplifier in Common Source configuration is:

A. Very high at high frequencies
B. Very high at low frequencies
C. Very low at high frequencies
D. Very low at low frequencies

Answer: B

The input impedance of MOSFET amplifier in Common Source configuration is very high at low frequencies.

13. In the below input-output characteristic of the MOSFET amplifier, if Vin > Vin1, the MOSFET is said to operate in:

A. Saturation region
B. Cutoff region
C. Triode region
D. None of the mentioned

Answer: C

When Vin>Vin1, then the transistor is said to operate in the triode region.

14. The voltage gain of the MOSFET is given by:

A. Av = -βRd
B. Av = γRd
C. Av = -gmRd
D. None of the mentioned

Answer: C

The voltage gain is equal to the negative of the product of transconductance and resistance.

15. The MOSFET is said to be in a diode-connected configuration if:

A. A diode is placed between supply and drain
B. A diode is placed between source and ground
C. Source and gate are connected
D. Drain and gate are connected

Answer: D

A MOSFET is connected in such a way that both gate and drain are connected to supply, then it is said to be in Diode connected condition.

16. The diode-connected MOSFET acts as:

A. Active element for amplification
B. Voltage source
C. Current Source
D. Load Impedance

Answer: D

The diode-connected configuration of MOSFET acts as Load impedance.

17. In the below circuit, if the levels of input and output vary, the gain is found to:

A. Increase linearly as input level increases
B. Decrease linearly as output level decreases
C. Remain constant
D. Vary non linearly

Answer: C

The gain remains relatively constant for variations in the input and output levels.

18. In the below circuit of the Common Source amplifier, the transistor M2 operates as:

A. Load impedance
B. Voltage source
C. Current Source
D. None of the mentioned

Answer: C

The transistor M2 operates as a current source in a Common source amplifier for providing large voltage gain.

19. The advantage of using a source degeneration resistor in a Common source amplifier is to provide:

A. Huge gain
B. Non-Linearity behavior of the amplifier
C. Linearity behavior of the amplifier
D. Less gain

Answer: C

Introducing a degenerative resistor makes the amplifier operate in linear conditions.

20. In the below circuit if the current source is ideal, the voltage gain is:

A. Av = -gm.Rs
B. Av = -Io.Rs
C. Av = -gm.Ron
D. None of the mentioned

Answer: C

Since the current source is ideal, the current through Rs cannot change and the hence small-signal voltage drop across it is zero, making the gain constant and dependent on Ron.

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