TY - GEN
T1 - 6.7 A 128Gb/s PAM-4 Transmitter with Programmable-Width Pulse Generator and Pattern-Dependent Pre-Emphasis in 28nm CMOS
AU - Sheng, Kai
AU - Gai, Weixin
AU - Feng, Zeze
AU - Niu, Haowei
AU - Ye, Bingyi
AU - Zhou, Hang
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - The ever-growing demands for high-bandwidth communications continuously push wireline links to operate at higher speeds. Recently reported transmitters (TXs) have achieved a data rate of more than 100Gb/s [1-6]. PAM-4 modulation, which doubles the data rate at the same symbol rate, has been widely adopted to make use of the link bandwidth more efficiently. However, the complex transitions introduce greater data-dependent jitter, decreasing the horizontal eye-opening. In addition, the transitions between non-adjacent levels bring about twice or three times inter-symbol interference (ISI) compared with transitions between adjacent levels, resulting in reduced vertical eye-opening. Although a feed-forward equalizer (FFE) can be used to mitigate these issues, it is usually implemented in a de-emphasis manner in PAM-4 TXs, which reduces the output swing and lowers the signal-to-noise ratio. The proposed TX incorporates a pulse generator with programmable width for optimizing transition edges and a pattern-dependent pre-emphasis scheme that performs equalization without sacrificing output swing.
AB - The ever-growing demands for high-bandwidth communications continuously push wireline links to operate at higher speeds. Recently reported transmitters (TXs) have achieved a data rate of more than 100Gb/s [1-6]. PAM-4 modulation, which doubles the data rate at the same symbol rate, has been widely adopted to make use of the link bandwidth more efficiently. However, the complex transitions introduce greater data-dependent jitter, decreasing the horizontal eye-opening. In addition, the transitions between non-adjacent levels bring about twice or three times inter-symbol interference (ISI) compared with transitions between adjacent levels, resulting in reduced vertical eye-opening. Although a feed-forward equalizer (FFE) can be used to mitigate these issues, it is usually implemented in a de-emphasis manner in PAM-4 TXs, which reduces the output swing and lowers the signal-to-noise ratio. The proposed TX incorporates a pulse generator with programmable width for optimizing transition edges and a pattern-dependent pre-emphasis scheme that performs equalization without sacrificing output swing.
UR - https://www.scopus.com/pages/publications/85151647403
U2 - 10.1109/ISSCC42615.2023.10067407
DO - 10.1109/ISSCC42615.2023.10067407
M3 - 会议稿件
AN - SCOPUS:85151647403
T3 - Digest of Technical Papers - IEEE International Solid-State Circuits Conference
SP - 120
EP - 122
BT - 2023 IEEE International Solid-State Circuits Conference, ISSCC 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE International Solid-State Circuits Conference, ISSCC 2023
Y2 - 19 February 2023 through 23 February 2023
ER -