An 8G Hz SST Transmitter with Adjustable FIR and Pre-Emphasis Logic in 65nm CMOS

YIDAN ZHANG; Tae wook Kim

doi:10.23075/jicas.2024.10.2.006

YIDAN ZHANG Yonsei University
Tae wook Kim Yonsei University

DOI: https://doi.org/10.23075/jicas.2024.10.2.006

Keywords: Pre-emphasis system, Adjustable, Impedance control, FIR, TX

Abstract

In response to the escalating demands for high-speed communication and the necessity for effective channel loss compensation, this study introduces an advanced transmitter (TX) system with enhanced adaptability. This system integrates a sophisticated TX architecture, augmented by a pre-emphasis logic and a three-tap Finite Impulse Response (FIR) filter, using TSMC's 65nm process technology. The core of the pre-emphasis architecture is a Voltage-Mode Driver topology, serving both as the primary driver and emphasis cell, supplemented by an additional logic to modulate the FIR's first tap. This modulation facilitates varied emphasis states, enabling tailored compensation for diverse channel losses. The FIR, realized through Current-Mode Logic (CML), optimizes power efficiency, while the driver configuration, composed of SST drivers, ensures a robust output swing. The incorporation of SST drivers ushers in a hybrid impedance control approach, merging conventional analog-loop control with impedance regulation via the SST driver slices. Simulation results show that the system achieves speeds of up to 8GHz and an output swing of 1.2V, while maintaining an eye width of 0.8 Unit Intervals (UI).

Author Biographies

YIDAN ZHANG, Yonsei University

ZHANG YIDAN received a B.S. degree in electrical and electronic engineering from Soochow University, China, in 2017 and is currently pursuing her M.S. degree at the Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea.

Her research interests include high speed serdes and equalization.

Tae wook Kim, Yonsei University

Tae Wook Kim (Senior Member, IEEE) was born in Seoul, South Korea, in 1974. He received the B.S. degree in electrical engineering from Yonsei University, Seoul, in 2000, and the M.S. and Ph.D. degrees from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 2002 and 2005 respectively.

He was with Qualcomm, Inc., Austin, TX, USA, where he was involved with DVB-H and Media FLO chip design. Since September 2007, he has been with the School of Electrical and Electronic Engineering, Yonsei University, Seoul, where he is currently a Professor. His research interests are in microwave, RF, analog, and mixed-signal ICs and systems.

Dr. Kim was served as a Technical Program Committee Member of IEEE ISSCC, IEEE A-SSCC, and IEEE APMC and an Organizing Committee Member of IEEE A-SSCC. He is serving as a TPC member of IEEE RFIC and a Steering Committee Member of IEEE MWSCAS.

Homepage : https://sites.google.com/site/yonseirfad/home