How does a CMOS inverter work as an amplifier?

Thread Starter

Asmita Nayak

Joined May 17, 2015
I know that it works as an amplifier in the transition or linear region. But how? What is the exact working operation? Please also explain in terms of i/o voltage/current?


Joined Aug 1, 2013
Without getting into Schmitt Triggers, all normal logic gates are very high gain linear amplifiers inside. Just like with an opamp, an inverting gate can act as an inverting linear amplifier with the appropriate negative feedback to limit the gain to something below its open-loop value. This works better with CMOS than TTL devices, and better with unbuffered CMOS than buffered (B series) CMOS, but the internal schematic tells the tale. Like everything in the digital universe, it's all analog inside.