Scalable 0.35V to 1.2V SRAM bitcell design from 65nm CMOS to 28nm FDSOI

Abstract

We present a design and characterization method for a scalable ultra-wide voltage range (UWVR) SRAM bitcell array, targeting a minimum voltage prediction, high yield and Si-CAD correlation within 5%. The experimental validation is first performed in bulk CMOS 65nm, then confirmed in 28nm FDSOI. Over 10× energy gain is achieved from 1.2V down to 0.35V range while measuring high speed at nominal voltage.