(a) Draw the circuit of a CMOS inverter. Plot its voltage transfer characteristics (VTC) and derive an expression for switching threshold. How does the relative sizes of the devices affects the VTC. 10
Explanation
The CMOS inverter is a simple circuit with two transistors, one n-channel and one p-channel. The VTC is a S-shaped curve with a switching threshold at VDD/2. The relative sizes of the devices affect the VTC, with larger devices resulting in a wider VTC and smaller devices resulting in a narrower VTC.
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