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A 16-GHz double-quadrature very low IF down-conversion mixer with polyphase filters is demonstrated using 0.15-μm metamorphic high electron mobility transistor (mHEMT) technology. Due to the hgih cutoff frequency of mHEMT device, the image rejection Gilbert mixer works at 16 GHz. The polyphase filters are employed to generate differential quadrature signals and eliminate the image signal at RF/LO...
This paper reports a 40 GHz sub-harmonic Gilbert upconverter with a leveled-LO configuration using 0.15-µm AlGaAs/InGaAs pseudomorphic high electron mobility transistor (PHEMT) technology. The sub-harmonic structure is employed because the LO frequency is only half of the RF frequency. A two-stage RC-CR polyphase filter forms a 20-GHz quadrature generation for the LO port of the upconverter while...
A 17-GHz Gilbert single-quadrature down-converter (SQDC) with polyphase filters is successfully demonstrated using 0.15-μm pseudomorphic high electron mobility transistor (pHEMT) technology for the first time to the best of our knowledge. Thanks to the semi-insulating GaAs substrate and an advanced technology, the image rejection Gilbert mixer works well at high frequencies. A polyphase filter at...
An X-band Weaver-Hartley dual-conversion low-IF downconverter is demonstrated in this paper using 0.35-??m SiGe heterojunction bipolar transistor (HBT) technology. The first image signal is shifted away from the IF band due to the complex Weaver architecture while the second image signal is eliminated by a polyphase filter in the following Hartley architecture. In this work, a resonant LC load is...
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