A Spur-and-Phase-Noise-Filtering Technique for Inductor-Less Fractional-N Injection-Locked PLLs

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

26 Scopus Citations
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Author(s)

  • Alvin Li
  • Yue Chao
  • Xuan Chen
  • Liang Wu
  • Howard C. Luong

Detail(s)

Original languageEnglish
Article number7904650
Pages (from-to)2128-2140
Journal / PublicationIEEE Journal of Solid-State Circuits
Volume52
Issue number8
Online published19 Apr 2017
Publication statusPublished - Aug 2017

Abstract

A novel phase-noise-filtering technique based on phase-domain averaging is proposed to suppress the large injection spurs and poor high-frequency phase noise of inductor-less injection-locked phase-locked loops (IL-PLLs). Demonstrated using a 1.2-GHz fractional-N IL-PLL based on a capacitive-ring-coupled ring oscillator, wideband spur-and-phase-noise suppression of up to 20 dB is achieved allowing for phase noise as low as -146 dBc/Hz at 30-MHz offset with a 2-MHz resolution. This allows for an inductor-less alternative to LC-based PLLs in scaled-digital CMOS technologies. The 65-nm CMOS prototype improves 10-MHz phase noise from -115 to -135 dBc/Hz, injection spurs from -40.5 to -57 dB, and integrated jitter from 3.57 to 1.48 ps while occupying an area of 0.6 mm2 and consuming 19.8 mW from a 0.85-V supply, resulting in an FoM and FoMJitter of -163 and -223.6 dB, respectively.

Research Area(s)

  • Capacitor ring (C-ring), coupled, delay line (DL), filter, fractional-N, IL, inductorless, injection-locked phase-locked loop (IL-PLL), local oscillator (LO), phase averager, phase noise, PLL, ring oscillator (RO), synthesizer, voltage-controlled oscillator (VCO)

Citation Format(s)

A Spur-and-Phase-Noise-Filtering Technique for Inductor-Less Fractional-N Injection-Locked PLLs. / Li, Alvin; Chao, Yue; Chen, Xuan et al.

In: IEEE Journal of Solid-State Circuits, Vol. 52, No. 8, 7904650, 08.2017, p. 2128-2140.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review