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A 1-GHz Tuning Range DCO with a 3.9 kHz Discrete Tuning Step for UWB Frequency Synthesizer

Chul NAM, Joon-Sung PARK, Young-Gun PU, Kang-Yoon LEE

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Summary :

This paper presents a wide range DCO with fine discrete tuning steps using a ΣΔ modulation technique for UWB frequency synthesizer. The proposed discrete tuning scheme provides a low effective frequency resolution without any degradation of the phase noise performance. With its three step discrete tunings, the DCO simultaneously has a wide tuning range and fine tuning steps. The frequency synthesizer was implemented using 0.13 µm CMOS technology. The tuning range of the DCO is 5.8-6.8 GHz with an effective frequency resolution of 3.9 kHz. It achieves a measured phase noise of -108 dBc/Hz at 1 MHz offset and a tuning range of 16.8% with the power consumption of 5.9 mW. The figure of merit with the tuning range is -181.5 dBc/Hz.

Publication
IEICE TRANSACTIONS on Electronics Vol.E93-C No.6 pp.770-776
Publication Date
2010/06/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.E93.C.770
Type of Manuscript
Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
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