Inversion Coefficient Based Design in CMOS amplifiers
Assuming this is limited to CMOS RF design; but you must do your own homework to find links e.g. Researchgate, Google Scholar, Microsoft Academic.

a priori


Choose the SPECS for BW(f), Linearity, 3OI, Power Gain (Gmin), Noise Figure, (NFmax), Power (Pmax) standby power, etc.
get select all spectral values of each active and passive component after selecting Inversion Coefficient(IC) vs channel length(L),  


simulate IC vs {Vgs, Cgs, Id, fT, gm, gm/Id,...}
define IC, Id, L, 
compute W, gm, gds, Cgs, Cgd,  
verify specs  and repeat until converged or all tradeoffs are met.



Design Optimization Methodology Based on Inversion Coefficient Parameter for CMOS RF Circuits. Available from: https://www.researchgate.net/publication/268219100_Design_Optimization_Methodology_Based_on_Inversion_Coefficient_Parameter_for_CMOS_RF_Circuits [accessed Jul 19, 2017].