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A locking-range enhancement technique is proposed for divide-by-4 injection-locked frequency dividers (ILFDs) at millimeter-wave frequencies. The working principle of the conventional divide-by-4 ILFDs is analyzed and verified with simulations to show that the limited locking range is mainly attributed to low efficiency of harmonic mixing. Based on the observation, an enhancement technique is developed...
A self-frequency-tracking (SFT) transformer-based injection-locked frequency divider (ILFD) with enhanced frequency locking range is presented. The SFT technique creates a frequency-dependent phase shift for the total current injected into the transformer tank to relax both the phase and gain conditions. Fabricated in a 65nm CMOS process, the presented SFT-ILFD achieves an input locking range of 29%...
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