A 1.1-pJ/b/Lane, 1.8-Tb/s Chiplet Using 113-Gb/s PAM-4 Transceiver With Equalization Strategy to Reduce Fractionally Spaced 0.5-UI ISI in 5-nm CMOS

This letter uses 113-Gb/s PAM4 transceiver in 5-nm CMOS to demonstrate a 1.8-Tb/s chiplet, over die-to-die extremely short-reach (XSR) intrapackage links, in an 8-port configuration. The 16-channels range from 1 to 12 dB of loss at $F_{\textrm {baud}}/2$ . The chiplet performance over these channels is better than $\textrm {BER}\lt 10^{-9}$ , while consuming <1.1-pJ/b power and 0.22-mm2 area per lane. The performance targets are achieved using an transceiver equalization strategy which minimizes 0.5-UI ISI by design in the data path and using a LUT-based TX FFE-3 for signal equalization and envelope adaptation.