A Chebyshev-Response Step-Impedance Phase-Inverter Rat-Race Coupler Directly on Lossy Silicon Substrate and Its Gilbert Mixer Application

Autor:	Chia-Hung Chang, Chinchun Meng, Sheng-Wen Yu, Hung-Ju Wei
Rok vydání:	2011
Předmět:	Engineering Radiation business.industry Condensed Matter Physics Chebyshev filter Characteristic impedance Rat-race coupler Electronic engineering Insertion loss Optoelectronics Magic tee Hybrid coupler Electrical and Electronic Engineering Wideband business Stripline
Zdroj:	IEEE Transactions on Microwave Theory and Techniques. 59:882-893
ISSN:	1557-9670 0018-9480
DOI:	10.1109/tmtt.2011.2108312
Popis:	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 (~ 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- ~ 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-μm 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::42240bf724428fa9a26231b7091a7cc8 https://doi.org/10.1109/tmtt.2011.2108312 Zobrazit plný text záznamu