Electrical Properties of MOS and BiCMOS Circuits MCQ Quiz – Objective Question with Answer for Electrical Properties of MOS and BiCMOS Circuits MCQ MCQ
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.
42. 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.
43. 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.
44. 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.
45. Increasing fan-out ____________ the propagation delay.
A. increases
B. decreases
C. does not affect
D. exponentially decreases
Answer: A
In the CMOS inverter, increasing the fan-out also increases the propagation delay. Fan-out is a term that defines the maximum number of digital inputs that the output of a single logic gate can feed.
46. Fast gate can be built by keeping ________
A. low output capacitance
B. high on-resistance
C. high output capacitance
D. input capacitance does not affect the speed of the gate
Answer: A
A fast gate can be built by keeping the output capacitance small and by decreasing the on-resistance of the transistor.
47. The transconductance of a bipolar is given by ______________
A. (kT/q)/Ic
B. Ic/(kT/q)
C. (q/KT)/Ic
D. Ic/(q/KT)
Answer: B
Transconductance gm of a bipolar transistor is given by gm = Ic/(kT/q). Transconductance is the electrical characteristic relating the current through the output of a device to the voltage across the input of a device.
48. Transconductance depends on the process.
A. true
B. false
Answer: B
Transconductance gm is independent of the process.
49. gm is ______ on input voltage Vbe.
A. inversely proportional
B. proportional
C. exponentially dependent
D. is not dependent
Answer: C
Transconductance gm is exponentially dependent on input voltage Vbe (base to emitter voltage).
50. gm is _______ to Ic.
A. directly proportional
B. inversely proportional
C. not dependent
D. exponentially proportional
Answer: A
Transconductance gm is directly proportional to Ic, collector current.
