31. Pass transistors are transistors used as ________
A. switches connected in series
Show Explanation
Answer: A
Pass transistors are transistors used as switches in series with lines carrying logic levels due to the isolated nature of the gate.
32. An inverter driven through one or more pass transistors has a Zp.u/Zp.d ratio of ________
A. 1/4
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Answer: D
An inverter driven directly from the output of another has the ratio of 4/1 and if driven through one or more pass transistors has the ratio of 8/1.
33. In depletion mode pull-up, dissipation is high since current flows when?
A. Vin = 1
Show Explanation
Answer: A
In nMOS depletion-mode pull-up, dissipation is high since current flows Vin = logical 1.
34. In complementary transistor pull-up, current flows when?
A. Vin = 1
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Answer: C
In complementary transistor pull-up no current flows either for logical 1 or 0, full logical 1 and 0 levels are presented at the output.
35. CMOS inverter has ______ regions of operation.
A. three
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Answer: D
CMOS inverter has five distinct regions of operation which can be determined by plotting CMOS inverter current versus Vin.
36. If the n-transistor conducts and has a large voltage between source and drain, then it is said to be in _____ region.
A. linear
Show Explanation
Answer: B
If the n-transistor conducts and has a large voltage between source and drain, then it is in saturation.
37. 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
Show Explanation
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.
38. In the region where inverter exhibits gain, the two transistors are in the _______ region.
A. linear
Show Explanation
Answer: D
In the region where the inverter exhibits gain, the two transistors n and p operate in the saturation region.
39. If both the transistors are in saturation, then they act as ________
A. current source
Show Explanation
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.
40. If βn = βp, then Vin is equal to ________
A. Vdd
Show Explanation
Answer: D
If βn = βp, then Vin = 0.5Vdd which implies that the changeover between logic levels is symmetrically disposed about the point.
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