6.1 A 112Gb/s Serial Link Transceiver With 3-tap FFE and 18-tap DFE Receiver for up to 43dB Insertion Loss Channel in 7nm FinFET Technology
Bo Zhang, Anand Vasani, Ashutosh Kumar Sinha, Alireza Nilchi, Haitao Tong, Lakshmi Rao, Karapet Khanoyan, Hamid Hatamkhani, Xiaochen Yang, Xin Meng, Alexander Wong, Jun Kim, Ping Jing, Yehui Sun, Ali Nazemi, Dean Liu, Anthony Brewster, Jun Cao, Afshin Momtaz
Abstract
Social media, video streaming and working at home fuels the demand for bandwidth in metro networks and data centers and pushes serial link data rates into <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$100\mathsf{Gb}/\mathsf{s}$</tex> territory. To cope with severe channel impairments at <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$112\mathsf{Gb}/\mathsf{s}$</tex> PAM-4 with <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$> 30\mathsf{dB}$</tex> loss at Nyquist, recently published transceivers [1–4] adopted <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathsf{ADC}/\mathsf{DSP}$</tex> -based receivers in advanced FinFET processes. This work presents a low-power and area-efficient non-ADC/DSP-based transceiver that employs fully adaptive 3-tap <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathsf{FFE}/18$</tex> -tap DFE at the receiver (RX) and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathsf{a} \ 7\mathsf{b}$</tex> DAC-based transmitter (TX) up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$112\mathsf{Gb}/\mathsf{s}$</tex> in <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$7\mathsf{nm}$</tex> FinFET technology for large-scale ASIC applications.