Electrical Properties of MOS and BiCMOS Circuits MCQ Quiz – Objective Question with Answer for Electrical Properties of MOS and BiCMOS Circuits MCQ MCQ
A. weak function
B. strong function
C. weak and strong function
D. none of the mentioned
Answer: A
Transconductance gm is a weak function of transistor size.
52. gm of bipolar is less than gm of MOS.
A. true
B. false
Answer: B
Transconductance gm of bipolar is greater than gm of MOS if inputs are controlled by equal amounts of charge.
53. Which of the following is true when inputs are controlled by equal amounts of charge?
A. Cg(MOS) = Cbase(bipolar)
B. Cg(MOS) greater than Cbase(bipolar)
C. Cg(MOS) lesser than Cbase(bipolar)
D. Cs(MOS) lesser than Cbase(bipolar)
Answer: A
Cg(MOS) = Cbase(bipolar) when inputs are controlled by equal amounts of charge, and then gm(bipolar) >> gm(MOS).
54. Which has better I/A?
A. CMOS
B. bipolar
C. nMOS
D. pMOS
Answer: B
Current/Area (I/A. of bipolar is five times better than CMOS and this can be calculated using base resistance and base transit time.
55. Bipolar transistor exhibits _______ delay.
A. turn on
B. turn off
C. storage
D. all of the mentioned
Answer: D
Bipolar transistors exhibit turn-on, turn-off, and storage delays.
56. In a bipolar transistor, which is heavily doped?
A. base region
B. emitter region
C. collector region
D. base and emitter
Answer: B
In a bipolar transistor, the emitter region is heavily doped and the base region is lightly doped.
57. Bipolar transistor is a symmetrical device.
A. true
B. false
Answer: B
The bipolar transistor is not symmetrical like other transistors.
58. In BiCMOS, bipolar transistors are used to ___________
A. drive input loads
B. drive output loads
C. to perform logic functions
D. to amplify the input voltage
Answer: B
In BiCMOS, bipolar transistors are used to drive output loads. A bipolar transistor can also be used as an amplifier, switch or as an oscillator.
59. In BiCMOS, MOS switches are used to __________
A. drive input loads
B. drive output loads
C. to perform logic functions
D. to amplify the input voltage
Answer: C
In BiCMOS circuits, MOS switches are used to perform logic functions. The ability to turn the power MOS “ON” and “OFF” allows the device to be used as a very efficient switch with switching speeds much faster than standard bipolar junction transistors.
60. The nMOS and pMOS transistors used in BiCMOS is ____________
A. depletion-mode
B. enhancement mode
C. only pMOS
D. only nMOS
Answer: B
The nMOS and pMOS transistors used in the BiCMOS device operate in enhancement mode. Enhancement mode devices are mostly common switching elements in MOS.
