11. 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.
12. 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.
14. 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.
15. A feature size square has ___________
A. L > W
B. W > L
C. L = W
D. L > d
Answer: C
A feature size square has L = W and its gate to channel capacitance value is called as square Cg.
16. What is the standard square Cg value of a 5-micron technology?
A. 0.01 pF
B. 0.1 pF
C. 1 pF
D. 10 pF
Answer: A
The standard square Cg value of a 5-micron technology is 0.01 pF. This standard square Cg value can be calculated by using the area of the standard square value and the capacitance value.
17. What is the standard square Cg value of a 1.2-micron technology?
A. 0.01 pF
B. 0.0023 pF
C. 0.023 pF
D. 0.23 pF
Answer: B
The standard square Cg value of a 1.2-micron technology is 0.0023 pF.
18. Relative area for L = 20λ and W = 3λ is?
A. 10
B. 15
C. 1/15
D. 1/10
Answer: B
Relative area for L = 20λ and W = 3λ is = (20λ × 3λ) / (2λ × 2λ) = 15. Relative area has no unit as two quantities of same type have been used.
19. What is the value of gate capacitance?
A. 0.25 square Cg
B. 1 square Cg
C. 1.25 square Cg
D. 1.5 square Cg
Answer: B
The value of gate capacitance is one square Cg. This is the standard value.
20. What is the delay unit of 5-micron technology?
A. 1 nsec
B. 0.1 nsec
C. 0.01 nsec
D. 1 sec
Answer: B
The Delay unit of 5-micron technology is 0.1 nsec.
