Wide-locking range class-C injection-locked frequency divider

A novel wide-locking range divide-by-3 injection-locked frequency divider (ILFD) is designed and fabricated in a standard 0.18 μm CMOS process. The CMOS ILFD uses a class-C capacitive cross-coupled oscillator as the core. It has been found that the locking range of the ILFD is enhanced when the DC-gate bias is smaller than the drain bias in the cross-coupled pair. At the supply voltage of 1.8 V, the core power consumption of the ILFD core is 10.7 mW. At the incident power of 0 dBm, the maximum locking range is 3.3 GHz (24.17%), from the incident frequency 12-15.3 GHz. At the incident power of 0 dBm, the operation range is 4.8 GHz (37.2%), from the incident frequency 10.5-15.3 GHz.