A wideband CMOS divide-by-3 injection-locked frequency divider

An injection locked frequency divider with odd division factor is presented. The divider works based on two-stage differential ring oscillator in which two quadrature injection signals are applied to the circuit. The divider can divide input RF signals by the factor of 3. The circuit has been designed in a 0.18 μm CMOS technology with a supply voltage of 1.8V. Simulation results in divide-by-3 mode, show that typical locking range of the divider is from 2 GHz to 10 GHz for -0.5 dBm injection signal level while its total power dissipation for 10 GHz input injection signal is 374 μW at the supply voltage of 1.8V.