標題: A silicon monolithic phase-inverter rat-race coupler using spiral coplanar striplines and its application in a broadband Gilbert mixer
作者: Tseng, Sheng-Che
Meng, Chinchun
Chang, Chia-Hung
Chang, Shih-Hsien
Huang, Guo-Wei
電信工程研究所
Institute of Communications Engineering
關鍵字: downconverter;micromixer;phase inverter;rat-race coupler;SiGeBiCMOS;silicon substrate;transimpedance amplifier;wideband
公開日期: 1-Aug-2008
摘要: This paper realized a broadband uniplanar phase-inverter rat-race coupler using a standard silicon process, and then analyzed this coupler under a lossy condition. A phase inverter is employed in this coupler, not only to extend the operation bandwidth, but also to generate balanced outputs by providing equal lossy paths, while symmetrical spiral-shaped coplanar striplines (CPSs) are also utilized to shrink the coupler size, as well as to construct a phase inverter in the middle of one of spiral CPSs. The lossy CPS, when designed as a distortionless line, has a real characteristic impedance, and thus, perfect port matching of the coupler can be achieved at the center frequency. The operation frequency of this silicon monolithic rat-race coupler with the size of 0.5 mm(2) is extremely wide and ranges from 5 to 23 GHz. The dissipated loss, transmission coefficient, and isolation of the rat-race coupler are approximately 5.5, -8, and below -25 dB, respectively. In addition, a wideband Gilbert micromixer with an integrated uniplanar phase-inverter rat-race coupler at the local oscillator port is demonstrated using 0.35-mu m SiGe BiCMOS technology. This mixer works from 2.5 to 13 GHz with 12-dB conversion gain, -16-dBm IP(1) (dB), -4-dBm IIP(3), and 14-dB noise figure. The chip size of the mixer with an integrated coupler is approximately 1.4 mm x 1.4 mm.
URI: http://dx.doi.org/10.1109/TMTT.2008.927312
http://hdl.handle.net/11536/8494
ISSN: 0018-9480
DOI: 10.1109/TMTT.2008.927312
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 56
Issue: 8
起始頁: 1879
結束頁: 1888
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