標題: A Chebyshev-Response Step-Impedance Phase-Inverter Rat-Race Coupler Directly on Lossy Silicon Substrate and Its Gilbert Mixer Application
作者: Wei, Hung-Ju
Meng, Chinchun
Yu, Sheng-Wen
Chang, Chia-Hung
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Broadband;Chebyshev response;CMOS;coplanar stripline (CPS);distortionless;down-converter;phase inverter;rat-race coupler;step impedance
公開日期: Apr-2011
摘要: This paper focuses on the analysis and the design methodology of the step-impedance phase-inverter rat-race coupler on a silicon-based process. The issues of impedance limitation and bandwidth are discussed in detail. Our proposed concept utilizes a high silicon dielectric constant, phase-inverter structure, step-impedance technique, and Chebyshev response to make the rat-race coupler more compact (similar to 64 reduction) and highly balanced over a wide operating bandwidth. Moreover, the inter-digital coplanar stripline used in the step-impedance section effectively reduces the characteristic impedance of the transmission line for large size shrinkage and insertion-loss reduction. The demonstrated step-impedance rat-race coupler directly on silicon substrate has 6- similar to 7-dB insertion loss from 5 to 15 GHz and small variations in amplitude/phase balance. Compared with our previous work, the proposed rat-race coupler achieves a 3-dB improvement in the insertion loss. Thus, a 0.13-mu m CMOS Gilbert down-converter with a miniature phase-inverter rat-race coupler at the RF path for wideband single-to-differential signal conversion achieves a noise figure of 16 dB.
URI: http://dx.doi.org/10.1109/TMTT.2011.2108312
http://hdl.handle.net/11536/133366
ISSN: 0018-9480
DOI: 10.1109/TMTT.2011.2108312
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 59
Issue: 4
起始頁: 882
結束頁: 893
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