Design of low phase noise fully differential LC-VCO = 낮은 위상 잡음 fully differential 구조의 LC전압 제어 발진기의 설계

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In this thesis, the new differentially tuned varactor structures are proposed to improve the previous differentially tuned topologies such as an anti-parallel configuration and a complementary structure using inversion-mode MOS varactor. And NMOS cross-LC-VCO with parallel PMOS transistor that is superior to the complementary cross-coupled LC-VCO for low voltage application is proposed and verified using TSMC 0.18㎛ CMOS process. The phase noise performance of a new differentially tuned LC-VCO using the modified anti-parallel structure is improved by 10 dB at 100 kHz offset frequency and 5 dB at 1 MHz offset frequency than that of LC-VCO with the previous anti-parallel because it has a higher Q-factor due to no connection of lossy bulk substrate . Also, CMRR which is a figure-of-merit to determine the common-mode rejection is improved by 2 dB. To improve the previous complementary structure using the inversion-mode n-type and p-type varactors that experience the different noise disturbance due to the separated body bias ($V_DD$ and ground), the complementary accumulation-mode MOS AMOS) varactor structure is proposed using a triple well process such as TSMC 0.18㎛ CMOS technology. Because of the deep n-well in a triple-well process, the p-type accumulation-mode varactor is possible to use. Although the phase noise of the proposed LC-VCO using the complementary AMOS varactor is not better than the anti-parallel structure because the gate length of the implemented p-type AMOS varactor is used at 0.5㎛ to match the C-V characteristic of n-type accumulation-mode varactor which is provided by TSMC PDK, it shows the possibility to use the differentially tuned varactor structure because CMRR is improved by about 2 dB. As the feature size of CMOS technology is scaled down, the power supply is also down to sub-1V. Although the complementary cross-coupled LC-VCO has the best performance because it has higher negative-gm value at same bias current due to PMOS cross-coupled p...
Advisors
Lee, Kwy-Roresearcher이귀로researcher
Description
한국과학기술원 : 전기및전자공학전공,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240720/325007  / 000995129
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학전공, 2004.8, [ x, 126 p. ]

Keywords

DIFFERENTIALLY-TUNED; LC-VCO; PHASE NOISE; VARACTOR STRUCTUREPOWER MOSFET ADMISSIBLE BANDWIDTHVIEW STEREOON; 차동 제어 바렉터 구조 스테레오 변환차분법; 위상 잡음; LC 전압 제어 발진기; DIFFERENTIALLY-TUNED; LC-VCO; PHASE NOISE; VARACTOR STRUCTUREPOWER MOSFET ADMISSIBLE BANDWIDTHVIEW STEREOON; 차동 제어 바렉터 구조 스테레오 변환차분법; 위상 잡음; LC 전압 제어 발진기

URI
http://hdl.handle.net/10203/35248
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240720&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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