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Which of the following statements are correct? (a) CMOS has a higher speed and smaller power than BJT. (b) CMOS ICs inputs should never be left unconnected as it may damage the device. (c) CMOS ICs with Schmitt trigger inputs are useful for better noise immunity. (d) CMOS is most popular logic family in VLSI Technology.

Which of the following statements are correct? (a) CMOS has a higher speed and smaller power than BJT. (b) CMOS ICs inputs should never be left unconnected as it may damage the device. (c) CMOS ICs with Schmitt trigger inputs are useful for better noise immunity. (d) CMOS is most popular logic family in VLSI Technology. Correct Answer (b), (c) and (d) are correct

 

BJT

CMOS

Input Power Loss

  >0 (IB > 0)

0 (IG = 0)

Dropout voltage

More

Lesser than BJT

Noise

More

Less

Fabrication Area

More

Less

Total power loss

More

Lesser than BJT

Thermal Runaway

Present

Absent

 

  • Unused CMOS input pins must never be unconnected because they tend to float towards the dangerous region which is in the middle between VDD and GND.
  • A CMOS Schmitt Trigger has the following advantages-
  • High input impedance, Low power consumption, even during transitions, High noise immunity, 0.7 Vcc typical.

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