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
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.
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
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.
3. 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.
4. The inverter has __________
A. low input impedance
B. high input impedance
C. high output impedance
D. high input and output impedance
Answer: A
The inverter has low input impedance. The basic inverter circuit requires a transistor with the source connected to the ground and a load resistor connected from the drain to the 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
Answer: A
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 a smaller area
C. high noise margin
D. all of the mentioned
Answer: D
The inverter has a high current driving capability, occupies a smaller area, and has high noise margins.
7. Output voltage swing should be reduced for a better performance of the BiCMOS circuit.
A. true
B. false
Answer: A
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 an output voltage swing.
8. BiCMOS inverter requires high load current sourcing.
A. true
B. false
Answer: A
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
Answer: A
BiCMOS has a 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
Answer: A
For improved base current discharge, two enhancement type nMOS transistors have to be added.
