Figure of Merit (FoM) of LNA and Mixer

There are many different definitions of FoM for different LNAs (wideband LNA, low power LNA, etc.).

For low power LNA, one definition is [1]

Wherein, the Gain is power gain.

Another two definitions are [2]:

A Mixer's FoM can be defined as [3]:

References:

[1] LEE, H., MOHAMMADI, S. A 3GHz subthreshold CMOS low noise amplifier. In Radio Frequency Integrated Circuits (RFIC)

Symposium, 2006, p. 4.
[2] Linten, D.; Aspemyr, L.; Jeamsaksiri, W.; Ramos, J.; Mercha, A.; Jenei, S.; Thijs, S.; Garcia, R.; Jacobsson, H.; Wambacq, P.; Donnay, S.; Decoutere, S.;
VLSI Circuits, 2004. Digest of Technical Papers. 2004 Symposium on, 17-19 June 2004 Page(s):372 - 375
 
http://wwwtw.vub.ac.be/elec/Papers%20on%20web/Papers/DLinten/LintenVLSI2004.pdf

[3] Vidojkovic, V. Van der Tang, J. Leeuwenburgh, A. Van Roermund, A.  Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on,  25-28 May 2003, Volume: 2, On page(s): II-300- II-303 vol.2