Abstract #0497

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

Michael Twieg¹, Soumyajit Mandal¹, and Mark A Griswold^1,2

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 0.5µm 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.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.