84. 44 COMPLEX MIMO 2.4 PJ/MAC 2.4 MHZ BASEBAND MIXED-SIGNAL SPATIAL PROCESSOR WITH 84 DB INTERFERENCE SUPPRESSION IN 65NM CMOS

Department: Electrical & Computer Engineering
Faculty Advisor(s): Gert Cauwenberghs

Primary Student
Name: Siddharth Joshi
Email: sijoshi@ucsd.edu
Phone: 571-215-4203
Grad Year: 2022

Student Collaborators
Chul Kim, chk079@eng.ucsd.edu | Sohmyung Ha, soha@ucsd.edu

Abstract
A flexible mixed-signal linear transform processor for spatial filtering, full-duplex self-interference cancellation and linear channel estimation operating over 2.4 MHz 44 complex MIMO channels is presented using a new nested-thermometer two-stage capacitive array multiplying DAC implementing signal weighting at 14-bit resolution. Measurements demonstrate 84 dB spatial separation over a wide range of incident angles and incident jammer power. Linearly mixed, spectrally indistinguishable 64-QAM and 16-QAM modulated signals are resolved with an RMS EVM of 2.9% and 3.1% respectively. With an active area of 1.7mm^2 in 65 nm CMOS, the processor consumes 99μW/channel from a 1.2 V supply, or just 2.4 pJ per 14-bit mixed-signal multiply-accumulate.

Industry Application Area(s)
Electronics/Photonics | Internet, Networking, Systems | Semiconductor

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