Browsing by Author "Yu, S. -W."

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2.4/5.7-GHz Dual-Band Dual-Conversion Low-IF Downconverter Using 0.35 mu m SiGe HBT Technology
(2010)
Syu, J. -S.
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Meng, C. C.
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Yu, S. -W.
;
Huang, G. -W.
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電機工程學系
A 2.4/5.7-GHz dual-band dual-conversion low-IF downconverter is demonstrated using 0.35 mu m SiGe heterojunction bipolar transistor (HBT) technology. The first image signal is shifted away from the IF band by a complex Weaver architecture while the second image signal is eliminated by a complex Hartley architecture. The downconverter achieves a 45/44-dB image-rejection ratio of the first image (IRR1) and a 50/48-dB image-rejection ratio of the second image (IRR2) for 2.4/5.7-GHz modes, respectively, when IF frequency ranges from 20 to 40 MHz.
Broadband SiGe HBT Gilbert downconverter with 1.8 to 36 GHz integrated dual Marchand balun
(2008-07-03)
Syu, J. -S.
;
Meng, C.
;
Yu, S. -W.
;
電信工程研究所
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Institute of Communications Engineering
A broadband Gilbert downconverter with an integrated dual Marchand balun (balanced to unbalanced transformer) is demonstrated by using 0.35 mu m SiGe heterojunction bipolar transistor (HBT) technology. A dual Marchand balun consisting of a lower band balun and an upper band balun is employed in the LO stage of the downconverter to maintain balanced LO signals from 1.8 to 36 GHz. The broadband downconverter has peak conversion gain of 3 dB at RF = 3 GHz and 3 dB bandwidth of 1.8 to 20 GHz at 3.3 V DC supply.