56 Gb/s PAM-4 optical receiver frontend in an advanced FinFET process. - Kunzhi Yu; Cheng Li; Tsung-Ching Huang; M. Ashkan Seyedi; Dacheng Zhou; Christopher Wilson; Daniel A. Berkram; Samuel Palermo; Jonathan Q. Smela; Marco Fiorentino; Raymond G. Beausoleil (MWSCAS, 2015)