Browsing by Author "Wei, H. -J."

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UWB Gilbert downconverter with lumped-distributed phase-inverter rat-race coupler based on Chebyshev band-broadening technique
(2011-07-21)
Wei, H. -J.
;
Meng, C.
;
Chang, C. -H.
;
Huang, G. -W.
;
電子工程學系及電子研究所
A broadband Gilbert downconverter with a miniature phase-inverter rat-race coupler is demonstrated using 0.35 mu m SiGe BiCMOS technology. By lumped-distributed and band-broadening techniques, a large shrinkage ratio with wide bandwidth of Chebyshev response can be simultaneously attained in the spiral-shape coplanar-stripline phase-inverter rat-race coupler. The area of the demonstrated lumped-distributed phase-inverter rat-race coupler is 0.65 x 0.65 mm(2) and the experimental bandwidth ranging from 2.5 to 12.5 GHz is large enough to cover the UWB bandwidth. As a result, a broadband Gilbert downconverter with the proposed coupler achieves a conversion gain of 11-12 dB, IP(1dB) of -11 dBm, IIP(3) of -1 dBm and noise figure of 16 dB from 3 to 11 GHz.