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A 1 GHz Tuning range VCO with a Sigma-Delta Modulator for UWB Frequency Synthesizer  

Nam, Chul (Department of Electronic Engineering, Konkuk University)
Park, An-Su (Department of Electronic Engineering, Konkuk University)
Park, Joon-Sung (Department of Electronic Engineering, Konkuk University)
Pu, Young-Gun (Department of Electronic Engineering, Konkuk University)
Hur, Jeong (Department of Electronic Engineering, Konkuk University)
Lee, Kang-Yoon (Department of Electronic Engineering, Konkuk University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.47, no.8, 2010 , pp. 64-72 More about this Journal
Abstract
This paper presents a wide range VCO with fine coarse tuning step using a sigma-delta modulation technique for UWB frequency synthesizer. The proposed coarse tuning scheme provides the low effective frequency resolution without any degradation of phase noise performance. With three steps coarse tuning, the VCO has wide tuning range and fine tuning step simultaneously. The frequency synthesizer with VCO was implemented with 0.13 ${\mu}m$ CMOS technology. The tuning range of the VCO is 5.8 GHz~6.8 GHz with the effective frequency resolution of 3.9 kHz. It achieves the measured phase noise of -108 dBc/Hz at 1 MHz offset and a tuning range 16.8 % with 5.9 mW power. The figure-of-merit with the tuning range is -181.5 dBc/Hz.
Keywords
Sigma-delta modulation; coarse tuning; UWB frequency synthesizer; phase noise; effective frequency resolution;
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