Abstract
A broadband Gilbert downconverter with a miniature phase-inverter rat-race coupler is demonstrated using 0.35µm 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 0.65×0.65 mm2 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, IP1dB of −11 dBm, IIP3 of −1 dBm and noise figure of 16 dB from 3 to 11 GHz.
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