A 0.35 mW 70 GHz Divide-by-4 TSPC Frequency Divider on 22 nm FD-SOI CMOS Technology

This paper presents a divide-by-4 TSPC frequency divider operating with supply voltages from 0.4 V to 0.9 V and covering input frequency ranges from below 100 MHz to 70 GHz and beyond. The operating frequency and the required input power is adjustable through the backgate voltages of the transistors of the employed fully depleted silicon on insulator (FD-SOI) technology. When operating at 70 GHz, the divider core consumes only 393 mA from a 0.9 V supply, which correspond to a FoM of 195 GHz/mW. To the best knowledge of the authors, the presented circuit demonstrates the highest reported operating frequency for TSPC dividers, and smallest area and lowest current consumption values among RF frequency dividers reported to date.