Desing of starved current VCO - transistor's sizes?

02 December 2016 0 3K Report

Hello everyone,

I am trying to design a current starved VCO (100 MHz) based with UMC 180nm. I have gone through many papers & books and none of them explain their choice of W/L of both the inverters and currents mirrors. Also i have seen different types: mirror's W/L > inverters, inverters W/L > mirrors or even equal. I have the impression that everyone does it on an empiric way just by testing and do not actually explained why.

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