A 5.7 GHz 0.35 m SiGe HBT UpconversionudMicromixer with a Matched Single-ended PassiveudCurrent Combiner Output

摘要

This paper demonstrates a small compact 5.7udGHz upconversion Gilbert micromixer using 0.35 m SiGeudHBT technology. A micromixer has a broadband matchedudsingle-ended input port. A passive LC current combiner isudused to convert micromixer differential output into a singleended output and doubles the output current for singleended-input and single-ended-output applications. Thus, a truly balanced operation of a Gilbert upconversion mixer with a single-ended input and a single-ended output isudachieved in this paper. The fully matched upconversionudmicromixer has conversion gain of –4 dB, OP1dB of –9.5 dBmudand OIP3 of –1.5 dBm when input IF=0.3 GHz, LO=5.4 GHzudand output RF=5.7 GHz. The IF input return loss is betterudthan 18 dB for frequencies up to 20 GHz while RF outputudreturn loss is 25 dB at 5.7GHz. The supply voltage is 3.3Vudand the current consumption is 4.6 mA. The die size is 0.9 ud0.9 mm2with 3 integrated on-chip inductors.