A novel 2.4-to-3.6 GHz wideband subharmonically injection-locked PLL with adaptively-aligned injection timing

Abstract

A novel wideband subharmonically injection-locked PLL (SILPLL) is proposed. It adopts a new injection timing alignment technique to adjust injection timing adaptively in wide range of the output clock frequency. A proposed pulse generator is used for half-integral injection to relax the trade-off between phase-noise of SILPLL and output frequency resolution. The SILPLL is implemented in 65 nm 1P9M CMOS process. It consumes 9.1mW from a 1.2V supply and occupies an active core area of 1×0.6 mm2. The measured output frequency range is 2.4~3.6GHz and the rms jitter integrated from 1kHz to 30MHz is 146fs when output frequency is 3GHz.