標題: Ka/Ku-Band pHEMT Gilbert Mixers With Polyphase and Coupled-Line Quadrature Generators
作者: Su, Jen-Yi
Tseng, Sheng-Che
Meng, Chinchun
Wu, Po-Yi
Lee, Yueh-Ting
Huang, Guo-Wei
電子工程學系及電子研究所
電信工程研究所
Department of Electronics Engineering and Institute of Electronics
Institute of Communications Engineering
關鍵字: Compensation;down-converter;polyphase filter;pseudomorphic HEMT (pHEMT);quadrature;single sideband (SSB);subharmonic;up-converter
公開日期: 1-May-2009
摘要: In this paper, three kinds of Ka/Ku-band Gilbert mixers are demonstrated using 0.15-mu m AlGaAs/InGaAs pseudomorphic high electron mobility transistor technology. Thanks to the semiinsulating GaAs substrate, microwave passive components have a low-loss feature, and polyphase filters work up to higher frequencies. Highly accurate tantalum-nitride thin-film resistors utilized in polyphase filters result in perfect quadrature operation. Therefore, our proposed single-sideband up-converter operates at 15 GHz with a 63-dB sideband rejection ratio, and another 34-GHz in-phase/quadrature (I/Q) subharmonic down-converter reaches <0.4-dB magnitude and < 1 degrees phase errors. More than 50-dB local oscillator (LO) leakage suppression is achieved in the I/Q subharmonic mixer. On the other hand, a 40-GHz stacked-LO subharmonic mixer with a novel compensation technique is also proposed and demonstrated to improve LO speed and reduce the amount of transistors, as compared to previous work.
URI: http://dx.doi.org/10.1109/TMTT.2009.2017242
http://hdl.handle.net/11536/7262
ISSN: 0018-9480
DOI: 10.1109/TMTT.2009.2017242
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 57
Issue: 5
起始頁: 1063
結束頁: 1073
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