GATE EC 2016 Set 1 — Question 28
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Digital Circuits → Combinational Logic → CMOS VTC & Noise Margin
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Question
What is the voltage in the following circuit?
Correct answer
(C) Switching threshold of inverter
Solution
In the given circuit, a feedback resistor is connected between the output and the input of a CMOS inverter.
1.Since the input of a CMOS inverter is connected to the gates of MOSFETs, the input current is zero ().
2.Consequently, there is no voltage drop across the feedback resistor ().
3.This forces the input voltage () to be equal to the output voltage ().
4.The point on the Voltage Transfer Characteristic (VTC) of an inverter where is defined as the switching threshold (or trip point) of the inverter.
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