6.4: A 64Gb/s PAM-4 Transmitter with 4-Tap FFE and 2.26pJ/b Energy Efficiency in 28nm CMOS FDSOI © 2017 IEEE International Solid-State Circuits Conference 1 of 31 A 64Gb/s PAM-4 Transmitter with 4-Tap FFE and 2.26pJ/b Energy Efficiency in 28nm CMOS FDSOI G. Steffan 1 , E. Depaoli 1 , E. Monaco 1 , N. Sabatino 1 , W. Audoglio 1 , A. A. Rossi 1 , S. Erba 1 , M. Bassi 2 , A. Mazzanti 2 1 STMicroelectronics, Pavia, Italy 2 Università degli Studi di Pavia, Pavia, Italy