A 1.59pJ/b 112Gb/s PAM-4 and 1.06pJ/b 168Gb/s PAM-8 Resistor-Less 7-Bit SST DAC-Based Transmitter with 8-Tap FFE in 28nm CMOS. - Yao-Hung Tsai; Ming-Han Chuang; Shen-Iuan Liu (ISSCC, 2026)