Abstract
This letter studies a wide-locking range divide-by-3 CMOS LC-tank injection locked frequency divider (ILFD) subjected to high injection power larger than 0 dBm and describes the operation principle of the ILFD. The ILFD circuit is realized with a double cross-coupled CMOS LC-tank oscillator with one injection MOS. The self-oscillating VCO is injection-locked by third-harmonic input to obtain the division factor of three. Measurement and simulation shows the locking range saturates at high injection power and then starts decreasing as injection power further increases.
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