6.4 A 56Gb/s 7.7mW/Gb/s PAM-4 Wireline Transceiver in 10nm FinFET Using MM-CDR-Based ADC Timing Skew Control and Low-Power DSP with Approximate Multiplier. - Byoung-Joo Yoo; Dong-Hyuk Lim; Hyonguk Pang; June-Hee Lee; Seung-Yeob Baek 002; Naxin Kim; Dong-Ho Choi; Young-Ho Choi; Hyeyeon Yang; Taehun Yoon; Sang-Hyeok Chu; Kangjik Kim; et al. (ISSCC, 2020)