This set of VLSI Multiple Choice Questions & Answers (MCQs) focuses on “BiCMOS Inverters”.
1. 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
View Answer
Explanation: In BiCMOS, bipolar transistors are used to drive output loads. Bipolar transistor can also be used as amplifier, switch or as an oscillator.
2. 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
View Answer
Explanation: 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.
3. The nMOS and pMOS transistors used in BiCMOS is ____________
a) depletion mode
b) enhancement mode
c) only pMOS
d) only nMOS
View Answer
Explanation: The nMOS and pMOS transistors used in BiCMOS device operates in enhancement mode. Enhancement mode devices are mostly common switching elements in MOS.
4. The inverter has __________
a) low input impedance
b) high input impedance
c) high output impedance
d) high input and output impedance
View Answer
Explanation: The inverter has low input impedance. The basic inverter circuit requires a transistor with source connected to ground and a load resistor connected from the drain to positive supply Vdd.
5. The inverter has __________
a) low output impedance
b) low input impedance
c) low power dissipation
d) high input and output impedance
View Answer
Explanation: The inverter has low output impedance and low input impedance. These are some of the properties of a BiCMOS inverter.
6. The inverter has __________
a) high current driving capability
b) occupies smaller area
c) high noise margin
d) all of the mentioned
View Answer
Explanation: The inverter has high current driving capability, occupies smaller area and has high noise margins.
7. Output voltage swing should be reduced for a better performance of BiCMOS circuit.
a) true
b) false
View Answer
Explanation: For a better performance BiCMOS circuit, the output voltage swing should be reduced. The possible maximum output peak-to-peak voltage obtained without clipping is called as output voltage swing.
8. BiCMOS inverter requires high load current sourcing.
a) true
b) false
View Answer
Explanation: BiCMOS inverter needs high load current sinking and sourcing. Sinking provides a grounded connection to the load, whereas sourcing provides a voltage source to the load.
9. BiCMOS has _______ standby leakage current.
a) higher
b) lower
c) very low
d) none of the mentioned
View Answer
Explanation: BiCMOS has higher standby leakage current and thus has high power consumption.
10. For improved base current discharge ________ enhancement type nMOS devices have to be added.
a) two
b) three
c) one
d) four
View Answer
Explanation: For improved base current discharge, two enhancement type nMOS transistors have to be added.
11. The BJTs in the BICMOS circuit is in _____________ configuration.
a) Push-pull
b) Totem pole
c) Active high
d) Active low
View Answer
Explanation: In BiCMOS circuit, the BJT transistors are in Totem pole configuration.
12. The MOSFETS are arranged in this configuration to provide __________
a) Zero static power dissipation
b) High Input impedance
c) Both zero static power dissipation and high input impedance
d) None of the mentioned
View Answer
Explanation: MOSFETs provide zero static power dissipation and high input impedance.
Sanfoundry Global Education & Learning Series – VLSI.
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