Title: | A silicon monolithic phase-inverter rat-race coupler using spiral coplanar striplines and its application in a broadband Gilbert mixer |
Authors: | 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 |
Keywords: | downconverter;micromixer;phase inverter;rat-race coupler;SiGeBiCMOS;silicon substrate;transimpedance amplifier;wideband |
Issue Date: | 1-Aug-2008 |
Abstract: | 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 |
Journal: | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES |
Volume: | 56 |
Issue: | 8 |
Begin Page: | 1879 |
End Page: | 1888 |
Appears in Collections: | Articles |
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