A 110GHz inductor-less CMOS frequency divider

Abstract

An inductor-less 110GHz ring-type frequency divider (RILFD) has been proposed. Body-injection and biasing technique have been adopted to achieve high speed and divide-by-three operation and fine tuning of operation frequency. The RILFD was fabricated by a 1P12M 65nm bulk CMOS process. The core size is 10.8×8.5μm2. The locking range is 9.1%, from 100.8 to 110.4GHz, under varying of body-bias voltage from −0.2V to 0.4V. The RILFD consumes 4.5mW at the supply voltage of 1V excluding an output buffer. The output phase noise is −117.6dBc/Hz at 1MHz offset. This work has been achieved the smallest core size among frequency dividers reported to date operating over 100GHz.