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Abstract #0497

N-path frequency mixers for ultra-high density receive arrays

Michael Twieg1, Soumyajit Mandal1, and Mark A Griswold1,2

1Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, OH, United States, 2Radiology, Case Western Reserve University, Cleveland, OH, United States

Dense MRI receiver arrays face challenges associated with RF cabling, power consumption, and space required by on-coil RF LNAs. On-coil frequency mixers and ADCs have been proposed as solutions to these challenges. Here we propose the use of passive N-path mixers implemented in CMOS for on-coil frequency conversion. We demonstrate a prototype fabricated in a 0.5┬Ám CMOS process, and compare its measured and simulated performance. We also show simulations of a similar design in 65nm CMOS with greatly improved performance. The improved version may handle multiple RF channels on a single chip, and eliminates the need for RF LNAs entirely.

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