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: | 1-十二月-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 |
顯示於類別: | 期刊論文 |