DocumentCode :
87652
Title :
A 9.2–12.7 GHz Wideband Fractional-N Subsampling PLL in 28 nm CMOS With 280 fs RMS Jitter
Author :
Raczkowski, Kuba ; Markulic, Nereo ; Hershberg, Benjamin ; Craninckx, Jan
Author_Institution :
imec, Leuven, Belgium
Volume :
50
Issue :
5
fYear :
2015
fDate :
May-15
Firstpage :
1203
Lastpage :
1213
Abstract :
This paper describes a fractional-N subsampling PLL in 28 nm CMOS. Fractional phase lock is made possible with almost no penalty in phase noise performance thanks to the use of a 10 bit, 0.55 ps/LSB digital-to-time converter (DTC) circuit operating on the sampling clock. The performance limitations of a practical DTC implementation are considered, and techniques for minimizing these limitations are presented. For example, background calibration guarantees appropriate DTC gain, reducing spurs. Operating at 10 GHz the system achieves -38 dBc of integrated phase noise (280 fs RMS jitter) when a worst case fractional spur of -43 dBc is present. In-band phase noise is at the level of -104 dBc/Hz. The class-B VCO can be tuned from 9.2 GHz to 12.7 GHz (32%). The total power consumption of the synthesizer, including the VCO, is 13 mW from 0.9 V and 1.8 V supplies.
Keywords :
CMOS integrated circuits; convertors; digital circuits; frequency synthesizers; jitter; microwave integrated circuits; phase locked loops; phase noise; CMOS; DTC circuit; LSB digital-to-time converter circuit; RMS jitter; VCO; fractional phase lock; frequency 9.2 GHz to 12.7 GHz; integrated phase noise; power 13 mW; sampling clock; size 28 nm; voltage 0.9 V; voltage 1.8 V; wideband fractional-N subsampling PLL; Delays; Phase locked loops; Phase modulation; Phase noise; Quantization (signal); Voltage-controlled oscillators; CMOS process; digital-controlled oscillators; digital-to-time converter; fractional-N; frequency synthesis; jitter; phase noise; phase-locked loops; radio transceivers; sampling; voltage-controlled oscillators;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2015.2403373
Filename :
7054573
Link To Document :
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