0
\$\begingroup\$

What is known as a common source amplifier is often built with an NMOS, where the bottom channel (source) is connected to ground. What if you switch out the NMOS with a PMOS, and the bottom channel is now really a drain connected to ground, is it still called a "Common Source Amplifier"? And is the gain still negative?

Thank you in advance

\$\endgroup\$
1
  • \$\begingroup\$ A PMOS Common Source amplifier would connect source to V+, and drain via a load (e.g. R) to V-/Gnd. Input voltage would be referred to V+ and output taken from drain as normal. What you are describing is ... well see AudioGuru's answer. \$\endgroup\$
    – user16324
    May 30, 2020 at 19:21

1 Answer 1

1
\$\begingroup\$

A P-channel Mosfet with its drain grounded is a source-follower (common-drain) with a gain of a little less than 1 and no inversion.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.