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Wideband GFSK-Modulated Frequency Synthesizer Using Two-Point Delta-Sigma Modulation

This dissertation presents a 2.4 GHz wideband GFSK-modulated frequency synthesizer using two-point delta-sigma modulation (TPDSM). The two bottlenecks in this design have been rigorously investigated. One bottleneck is the nonlinear performance of the phase-locked loop (PLL). The other one is the inherent gain and delay mismatch between the two modulation points. Both nonlinear and mismatch factors dominate the modulation accuracy in the closed PLL. The proposed formulation can successfully predict the dependencies of the modulation accuracy on both factors. The comparison of the averaged frequency deviation and frequency-shift -keying (FSK) error between theory and measurement shows excellent agreement. The modulated frequency synthesizer implemented in this study can achieve a 2.5 Mbps data rate as well as a 15 £gs PLL stable time with only 2.2 % FSK error under good design and operating conditions.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0503105-140434
Date03 May 2005
CreatorsPeng, Kang-Chun
ContributorsSheng-Fuh Chang, Chih-Wen Kuo, Chin-Chun Meng, Chia-Chan Chang, Ken-Huang Lin, Tzyy-Sheng Horng, Huey-Ru Chuang, Kin-Lu Wong, Shuenn-Yuh Lee
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageEnglish
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0503105-140434
Rightsunrestricted, Copyright information available at source archive

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