Analysis and solutions for phase noise degradation by the AM-FM conversion in CMOS LC-VCO

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The AM-FM conversion mechanism caused by the nonlinear behaviors of the varactor and switching transistor capacitances, respectively, with respect to the output voltage swing is analyzed. The varactor effect is analyzed and explained, based on the Fourier series analysis, by deriving the effective capacitance variations as a function of output voltage amplitude and normalized varactor bias. The principle of switching transistor effect is explained understanding the change of effective capacitances caused by the transistor mode transition. Circuit techniques that can resolve the varactor and switching transistor capacitance effects, respectively, are introduced and the effectiveness of each technique are tested based on simulations. An AM-FM conversion free VCO topology is proposed and fabricated in 0.18$\mum$ CMOS technology for 1.9GHz operation and verifying measurement results are reported.
Advisors
Lee, Sang-Gugresearcher이상국researcher
Description
한국정보통신대학교 : 공학부,
Publisher
한국정보통신대학교
Issue Date
2009
Identifier
393131/225023 / 020015323
Language
eng
Description

학위논문(박사) - 한국정보통신대학교 : 공학부, 2009.2, [ viii, 78 p. ]

Keywords

RF 집적회로; 위상잡음; AM-FM 변환; 전압제어발진기; CMOS; Phase noise; AM-FM conversion; VCO; RFIC

URI
http://hdl.handle.net/10203/54623
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=393131&flag=dissertation
Appears in Collection
School of Engineering-Theses_Ph.D(공학부 박사논문)
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