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All-digital millimeter-wave (mmWave) massive multi-user multiple-inputmultiple-output (MU-MIMO) receivers enable extreme data rates but require highpower consumption. In order to reduce power consumption, this paper presentsthe first resolution-adaptive all-digital receiver ASIC that is able to adjustthe resolution of the data-converters and baseband-processing engine to theinstantaneous communication scenario. The scalable 32-antenna, 65 nm CMOSreceiver occupies a total area of 8 mm$^\text{2}$ and integratesanalog-to-digital converters (ADCs) with programmable gain and resolution,beamspace channel estimation, and a resolution-adaptive processing-in-memoryspatial equalizer. With 6-bit ADC samples and a 4-bit spatial equalizer, ourASIC achieves a throughput of 9.98 Gb/s while being at least 2x moreenergy-efficient than state-of-the-art designs.

A Resolution-Adaptive 8 mm$^\text{2}$ 9.98 Gb/s 39.7 pJ/b 32-Antenna All-Digital Spatial Equalizer for mmWave Massive MU-MIMO in 65nm CMOS