Latch-up in CMOS MCQ Quiz – Objective Question with Answer for Latch-up in CMOS MCQ

11. Latch-up is the generation of __________

A. low impedance path
B. high impedance path
C. low resistance path
D. high resistance path

Answer: A

Latch-up is the generation of the low-impedance path in CMOS chips between the power supply and ground rails.

12. Latch-up is brought about by BJTs __________

A. with positive feedback
B. with negative feedback
C. with no feedback
D. without BJT

Answer: A

Latch-up occurs due to BJTs for silicon-controlled rectifiers with positive feedback and virtually short-circuit the power and ground rail.

13. Sudden transient in power can cause latch-up.

A. true
B. false

Answer: A

Sudden transient in power and ground buses are also among the reason which causes the latch-up effect.

14. BJT gain should be ______ to avoid the latch-up effect.

A. increased
B. decreased
C. should be maintained constant
D. changed randomly

Answer: B

BJT gain should be reduced by lowering the minority carrier lifetime through doping of the substrate to lower the latch-up effect.

15. The BiCMOS are preferred over CMOS due to ______________

A. Switching speed is more compared to CMOS
B. Sensitivity is less with respect to the load capacitance
C. High current drive capability
D. All of the mentioned

Answer: D

These are the 3 advantages of BiCMOS over CMOS.

16. The transistors used in BiCMOS are __________

A. BJT
B. MOSFET
C. Both BJT and MOSFETs
D. JFET

Answer: C

BiCMOS is a combination of both MOSFET and BJT.

17. The high current driving capability of the BiCMOS is due to __________
A. NMOS in saturation mode
B. PMOS in saturation mode
C. CMOS
D. BJT

Answer: D

BJT has a high current driving capability.

18. In BiCMOS inverter, the BJT used are __________

A. Only Npn BJT
B. Only Pnp BJT
C. Both NPN and PNP BJT
D. Multi emitter npn BJT

Answer: A

NPN BJTs are used in BiCMOS inverter.

19. Which of the following is the drawback of the BiCMOS circuits?

A. Sensitivity is less load capacitance
B. Bipolar transistors are used for driving current to the load capacitance but not for the logic operations
C. Increased fabrication Complexity
D. All of the mentioned

Answer: C

The other 2 are the merits of BiCMOS, Increased fabrication Complexity is a demerit of BiCMOS circuits.

20. The Bipolar Transistor is fabricated on __________

A. Same substrate of nMOS
B. N-well in p Substrate
C. P-well in n Substrate
D. Same substrate of pMOS

Answer: A

BiCMOS is fabricated on the same substrate as nMOS.

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