Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
Volume 70, Issue 10, Pages 3792-3796Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2023.3288120
Keywords
Fractional-N PLL; ring VCO; cascaded PLL; burst-mode sampling (BMS) scheme
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This brief presents a compact and power-efficient full ring-oscillator (RO)-based cascaded fractional-N PLL. The proposed PLL prototype achieves a 686 fs integrated rms jitter at a 4 GHz output frequency, while consuming 10.21mW. The BMS scheme is introduced to improve the phase noise of the frequency multiplier.
This brief presents a compact and power-efficient full ring-oscillator (RO)-based cascaded fractional-N PLL. The proposed cascaded PLL consists of a RO-based DLL and type-II PLL as the first and second stages, respectively. The first stage serves as a frequency multiplier that increases the operating frequency of the delta-sigma modulator (DSM) in the second stage, thereby suppressing its quantization noise. A burst-mode sampling (BMS) scheme is introduced to improve the phase noise (PN) of the frequency multiplier and achieves a PN multiplication factor removal. Implemented in a 28nm CMOS technology, the PLL prototype occupies a 0.016 mm(2) active area, achieving a 686 fs integrated rms jitter from 10KHz to 40MHz at a 4 GHz output frequency; while consuming 10.21mW with -233.6 dB FoMjitter. The measured fractional and reference spurs are -59.8 dBc and -54.5 dBc, respectively.
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