THz CMOS signal generator and ASK transmitterTHz CMOS 신호 발생기와 ASK 송신기

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THz CMOS VCOs with wide tuning range and ASK transmitter using Q-switching VCO are proposed. The VCOs have been designed at G-band (163 GHz) and J-band (239 GHz), respectively. The ASK transmitter has been implemented using the later VCO. First, the G-band VCO adopts a push-push standing-wave structure. By properly distributing negative gm cells in a transmission-line (TL) resonator, wide frequency tuning range with low phase noise can be obtained. The electrical length of the TL resonator is determined to have a high 2nd harmonic output power. Second, the J-band push-push transformer-based VCO is proposed. It has been also analyzed to achieve high efficiency and a wide tuning range at THz frequencies. Analyses show that the coupling factor of the transformer to obtain high output power has to be carefully chosen by consideration of gate-to-drain voltage gain as well as matching impedances seen from the drain and to the gate of a VCO transistor at the 2nd harmonic frequency. Analysis also shows that the transformer-based resonator allows a wide tuning range. The Q factor of the resonator is enhanced by the introduction of a parallel inductor to a varactor, which leads to high $P_{OUT}$ and low phase noise. Finally, the 254 GHz ASK transmitter using Q-switching characteristic of the J-band VCO is proposed. Design method for high data rate and high on/off ratio has been analyzed.
Advisors
Hong, Songcheolresearcher홍성철researcher
Description
한국과학기술원 :전기및전자공학과,
Publisher
한국과학기술원
Issue Date
2015
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학과, 2015.2,[iv, 103 p. :]

Keywords

Terahertz; CMOS; VCO; ASK; transmitter; 테라헤르츠; 전압 제어 발진기; 송신기

URI
http://hdl.handle.net/10203/241987
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=669256&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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