A 0.8V 57GHz-to-72GHz differential-input frequency divider with locking range optimization in 0.13μm CMOS

A current-bleeding technique is presented to enhance and maximize the locking range of a differential-input Miller divider (MD) without extra inductor and extra power. The maximum locking range and the associated optimal bleeding current to achieve minimum required output amplitude are derived. Implemented in a 0.13μm CMOS technology and with 0dBm input power, the divider prototype measures a locking range of 23.2% from 56.7GHz to 71.6GHz, which is enhanced more than 5 times compared to that of the conventional MD, while consuming the same power of 5mW at 0.8V supply.