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Journal Article A 6.3-9-GHz CMOS fast settling PLL for MB-OFDM UWB applications
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Authors
Geum-Young Tak, Seok-Bong Hyun, Tae Young Kang, Byoung Gun Choi, Seong Su Park
Issue Date
2005-08
Citation
IEEE Journal of Solid-State Circuits, v.40, no.8, pp.1671-1679
ISSN
0018-9200
Publisher
IEEE
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1109/JSSC.2005.852421
Abstract
A CMOS phase-locked loop (PLL) which synthesizes frequencies between 6.336 and 8.976 GHz in steps of 528 MHz and settles in approximately 150 ns is presented. The proposed PLL can be employed as a building block for a frequency synthesizer which generates a seven-band hopping carrier for multiband orthogonal frequency division multiplexing (MB-OFDM) ultrawideband (UWB) radio. To achieve fast loop settling, integer-N architecture that operates with 528-MHz reference frequency is implemented and a wideband active-loop filter is integrated. An improved phase-frequency detector (PFD) is proposed for faster loop settling. To reduce reference sidebands, a feedback circuit using replica bias is implemented in the charge pump. I/Q carriers are generated by two cross-coupled LC VCOs. The output current of the charge pump is controlled to compensate for the VCO gain nonlinearity and a programmable frequency divider (12 ?돞 N ?돞 17) that reliably operates at 9 GHz is designed. Fabricated in 0.18-μm CMOS technology, the PLL consumes 32 mA from a 1.8-V supply and achieves phase noise of -109.6 dBc/Hz at 1-MHz offset and spurs of -52 dBc. © 2005 IEEE.
KSP Keywords
6 GHz, Building block, CMOS Technology, Charge pump, Fast Settling, Feedback Circuit, Frequency synthesizer, MB-OFDM UWB, Multiband orthogonal frequency division multiplexing, Orthogonal frequency division Multiplexing(OFDM), Phase frequency detector