A 40gb/S 6pj/B Rx Baseband In 28nm Cmos For 60ghz Polarization Mimo

To meet burgeoning demand for PAN connectivity between content-rich consumer devices, the next-generation 60GHz standard [1] supports higher per-user bandwidth with frequency-channel bonding and enhances frequency reuse with MIMO. At millimeter-wave frequencies, orthogonal polarizations (pol) of propagation provide an additional degree of antenna/frequency reuse for MIMO multiplexing [2]. While the associated 2x increase in data-rate is promising, the feasibility of a simultaneous dual-pol (DP) link may be limited by cross-pol interference (CPI) (both same-symbol and multipath) and co-pol multipath reflection-based ISI. To efficiently mitigate CPI and ISI and enable 60GHz 2×2 DP-MIMO operation, this work demonstrates a mixed-signal pol-equalizer RX baseband with CDR (Fig. 9.4.1). The design supports equalization of QPSK/16-QAM constellations up to 5Gsymbols/s (Gsym/s) similar to 3x channel bonding [1].