11. CMOS inverter has ______ regions of operation.
A. three
B. four
C. two
D. five
Answer: D
CMOS inverter has five distinct regions of operation which can be determined by plotting CMOS inverter current versus Vin.
12. If the n-transistor conducts and has a large voltage between source and drain, then it is said to be in _____ region.
A. linear
B. saturation
C. non-saturation
D. cut-off
Answer: B
If the n-transistor conducts and has a large voltage between source and drain, then it is in saturation.
13. If the p-transistor is conducting and has a small voltage between source and drain, then it is said to work in ________
A. linear region
B. saturation region
C. non-saturation resistive region
D. cut-off region
Answer: C
If the p-transistor is conducting and has a small voltage between source and drain, then it is said to be in the unsaturated resistive region.
14. In the region where inverter exhibits gain, the two transistors are in the _______ region.
A. linear
B. cut-off
C. non-saturation
D. saturation
Answer: D
In the region where the inverter exhibits gain, the two transistors n and p operate in the saturation region.
15. If both the transistors are in saturation, then they act as ________
A. current source
B. voltage source
C. divider
D. buffer
Answer: A
When both the transistors are in saturation, they act as current sources so that the equivalent circuit is two current sources between Vdd and Vss.
16. If βn = βp, then Vin is equal to ________
A. Vdd
B. Vss
C. 2Vdd
D. 0.5Vdd
Answer: D
If βn = βp, then Vin = 0.5Vdd which implies that the changeover between logic levels is symmetrically disposed about the point.
17. Mobility depends on ________
A. Transverse electric field
B. Vg
C. Vdd
D. Channel length
Answer: A
Mobility is affected by the transverse electric field and thus also depends on Vgs and the mobility of p-device and n-device are inherently unequal.
18. In a CMOS inverter, the transistor is a switch having ________
A. infinite on resistance
B. finite off resistance
C. buffer
D. infinite off resistance
Answer: B
In a CMOS inverter, the transistor is a switch having finite on resistance and infinite off resistance.
19. CMOS inverter has ______ output impedance.
A. low
B. high
C. very high
D. none of the mentioned
Answer: A
CMOS inverter has low output impedance and this makes it less prone to noise and disturbance.
20. What is the input resistance of the CMOS inverter?
A. high
B. low
C. very low
D. none of the mentioned
Answer: A
The input resistance of the CMOS inverter is extremely high as it is a perfect insulator and draws no dc input source.
