Wide-band divide-by-4 injection-locked frequency divider using RLC resonator and capacitive cross-coupled oscillator

A wide locking range divide-by-4 injection-locked frequency divider (ILFD) using a standard 0.18 μm CMOS process is presented. The ILFD circuit is realized with a capacitive cross-coupled n-core MOS dual-resonance RLC-tank oscillator to extend the locking range. The core power consumption of the ILFD core is 11.872 mW. The divider's free-running frequency has dual-bands at 2.87 and 2.69 GHz by switching the varactor's control bias, and at the incident power of 0 dBm the locking range is 3.2 GHz (28.82%), from the incident frequency 9.5 to 12.7GHz.