3.4 A 40/50/100Gb/s PAM-4 Ethernet transceiver in 28nm CMOS. - Karthik Gopalakrishnan; Alan Ren; Amber Tan; Arash Farhood; Arun Tiruvur; Belal Helal; Chang-Feng Loi; Chris Jiang; Halil Cirit; Irene Quek; Jamal Riani; James Gorecki; et al. (ISSCC, 2016)