標題: 15 GHz High-Isolation Sub-Harmonic Mixer With Delay Compensation
作者: Syu, Jin-Siang
Meng, Chinchun
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: Heterojunction bipolar transistor (HBT);Marchand balun;polyphase filter;SiGe;sub-harmonic mixer (SHM)
公開日期: 1-Dec-2009
摘要: A 15-GHz high-isolation sub-harmonic mixer (SHM) with delay compensation is demonstrated in this letter using 0.35 mu m SiGe heterojunction bipolar transistor (HBT) technology. The proposed SHM consisting of two parallel stacked-LO mixer cores with opposite LO I/Q inputs substantially improves port-to-port isolation. A mathematical analysis regarding the isolation properties is also included in this letter. Further, a conventional stacked-LO SHM (w/o compensation) is also implemented with the same device sizes and bias conditions for a fair comparison. SHMs w/ and w/o compensation have similar conversion gain of 9/10 dB and noise figure of 14/13.5 dB when f(LO) = 7.5 GHz. However, the delay compensation technique improves the 2LO-RF/IF isolation by 34/35 dB, the LO-RF/IF isolation by 8/9 dB, and the RF-IF isolation by 22 dB.
URI: http://dx.doi.org/10.1109/LMWC.2009.2033522
http://hdl.handle.net/11536/6399
ISSN: 1531-1309
DOI: 10.1109/LMWC.2009.2033522
期刊: IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume: 19
Issue: 12
起始頁: 810
結束頁: 812
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