K-band, low-power CMOS injection-locked divide-by-three circuit using shunt-peaking and current-bleeding techniques

A CMOS divide-by-three injection-locked frequency divider having a wide input locking range of 23-27 GHz is proposed. The wide locking range is achieved by combining the shunt-peaking and current-bleeding techniques. The proposed circuit is fabricated using a 0.18-μm RF CMOS process, and the measured operation range (i.e., total locking range) is 4.32 GHz (from 23.17 to 27.49 GHz) for an input injection power of +4 dBm. The power consumption is 4.28 mW at a supply voltage of 1.2 V. The second-and third-order harmonic suppressions are 38.05 and 37.89 dBc, respectively, for a divided output frequency of 8.4 GHz. The output phase noise under lock at an offset of 1 MHz with an input injection power of +4 dBm is-139 dBc/Hz.