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

1. The difference output of the basic differential amplifier is taken at ________

a) At X and ground
b) At Y and ground
c) Difference of the voltages at the gates of M1 and M2
d) Difference of the voltages between X and Y

The difference output of the basic differential amplifier is taken at the difference in the voltages between X and Y.

2. The Differential output of the difference amplifier is the amplification of __________

a) Difference between the voltages of input signals
b) Difference between the output of the each transistor
c) Difference between the supply and the output of the each transistor
d) All of the mentioned

The Differential output of the difference amplifier is the amplification of the difference between the voltages of input signals.

3. The inputs to the differential amplifier are applied at __________

a) At X and Y
b) At the gates of M1 and M2
c) All of the mentioned
d) None of the mentioned

The inputs to the differential amplifier are applied at the gates of M1 and M2.

4. The Maximum and minimum output of the Differential amplifiers is defined as:

a) Vmax = VDD, Vmin = -VDD
b) Vmax = VDD, Vmin = Rd.Iss
c) Vmax = VDD, Vmin = VDD – Rd.Iss
d) None of the mentioned

The Maximum and minimum output of the Differential amplifiers is defined as

Vmax = VDD, Vmin = VDD – Rd.Iss

5. In Common Mode Differential Amplifier, the outputs Vout1 and Vout2 are related as:

a) Vout2 is in out of phase with Vout1 with same amplitude
b) Vout2 and Vout1 have same amplitude but the phase difference is 90 degrees
c) Vout1 and Vout2 have same amplitude and are in phase with each other and their respective inputs
d) Vout1 and Vout2 have same amplitude and are in phase with each other but out of phase with their respective inputs

In Common Mode Differential Amplifier, the outputs Vout1 and Vout2 are related as Vout1 and Vout2 have the same amplitude and are in phase with each other but out of phase with their respective inputs.

6. In a small signal differential gain vs input CM level graph, the gain decreases after V2 due to:

a) As the input voltage increases, the output will be clipped
b) When the input voltage to the transistors is high, the transistor enters the saturation region and increases the current, which in turn decreases the output voltage = VDD – Rd.Iss
c) When Common Mode voltage is greater than or equal to V2, the input transistors enter triode region, the gain begins to fall
d) Increasing the input voltage beyond V2 causes the gate oxide to conduct and the gain is reduced

In a small signal differential gain vs input CM level graph, the gain decreases after V2 due to when the Common Mode voltage is greater than or equal to V2, the input transistors enter the triode region, the gain begins to fall.

8. The input-output characteristic of an amplifier is

A. Linear function
B. Non-Linear function
C. Sinusoidal function with the change of phase
D. None of the mentioned

The input output characteristic of an amplifier is non linear function. It is given by y(t) = a0 + a1x(t) + a2x(t)^2…..

9. The amplifier works as a linear system for:

A. High-frequency signals
B. Low-frequency signals
C. Small signals
D. Large signals

The amplifier works as linear system for small signals and the output y(t) = a0+a1x(t).

10. In the MOSFET amplifier, the input is applied as:

A. Voltage across gate and source
B. Voltage across drain and source
C. Current at gate
D. Current at Drain