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  

IEICE TRANSACTIONS on Electronics   Vol.E93-C    No.6    pp.770-776
Publication Date: 2010/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.770
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
ΣΔ modulation,  discrete tuning,  UWB,  frequency synthesizer,  phase noise,  effective frequency resolution,  

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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.