MOSFET in high frequency applications

Question

I've heard that MOSFETs for high frequency circuits are generally configured as common gate.

Can anyone explain why? Could this be related with the internal MOS capacity?

I think tou are generalizing too much, as MOS are used in high frequency with almost all possible configurations; think to CMOS, in which the basic configuration is common source: it's used in many high-frequency (relatively speaking, as you didn't specify what you mean with "high frequency") circuits.

Uiy · Answer 1 · 2012-02-27 12:24:22Z

In high frequency RF applications one can get around the miller capacitance by using a cascode which uses the common gate configuration.

Also, It behaves different and as more like a current buffer rather than a voltage buffer. On the wiki page you can see how the gain's behave.

1 Answer