9.2 A scalable 0.1-to-1.7GHz spatio-spectral-filtering 4-element MIMO receiver array with spatial notch suppression enabling digital beamforming

Multiple-antenna receivers offer numerous advantages over single-antenna receivers, including sensitivity improvement, ability to reject interferers spatially and enhancement of data-rate or link reliability via MIMO. In the recent past, RF/analog phased-array receivers have been investigated [1-4]. On the other hand, digital beamforming offers far greater flexibility, including ability to form multiple simultaneous beams, ease of digital array calibration and support for MIMO. However, ADC dynamic range is challenged due to the absence of spatial interference rejection at RF/analog.

[1]  Eric A. M. Klumperink,et al.  A 1.0-to-4.0GHz 65nm CMOS four-element beamforming receiver using a switched-capacitor vector modulator with approximate sine weighting via charge redistribution , 2011, 2011 IEEE International Solid-State Circuits Conference.

[2]  Eric A. M. Klumperink,et al.  A 1-to-2.5GHz phased-array IC based on gm-RC all-pass time-delay cells , 2012, 2012 IEEE International Solid-State Circuits Conference.

[3]  Eric A. M. Klumperink,et al.  Simultaneous spatial and frequency-domain filtering at the antenna inputs achieving up to +10dBm out-of-band/beam P1dB , 2013, 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers.

[4]  Eric A. M. Klumperink,et al.  3.5 A 1.0-to-2.5GHz beamforming receiver with constant-Gm vector modulator consuming < 9mW per antenna element in 65nm CMOS , 2014, 2014 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC).

[5]  Pui-In Mak,et al.  2.4 A 0.028mm2 11mW single-mixing blocker-tolerant receiver with double-RF N-path filtering, S11 centering, +13dBm OB-IIP3 and 1.5-to-2.9dB NF , 2015, 2015 IEEE International Solid-State Circuits Conference - (ISSCC) Digest of Technical Papers.