A 15 Gb/s Non-Return-to-Zero Transmitter With 1-Tap Pre-Emphasis Feed-Forward Equalizer for Low-Power Ground Terminated Memory Interfaces

Youngwook Kwon, Hyunsu Park, Yoonjae Choi, Jincheol Sim, Jonghyuck Choi, Seungwoo Park, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This brief presents a 1-tap pre-emphasis transmitter (TX) for a single-ended ground-terminated memory interface with 28 nm complementary metal-oxide-semiconductor (CMOS) technology. By employing a charge pump scheme, a voltage level below ground was used to remove inter-symbol interference (ISI). Encoded with the unit interval (UI) delayed data, the proposed equalization technique increases the vertical voltage margin for the receiver (RX) compared to conventional feed-forward equalization (FFE). In addition, the short current after equalization was removed, and impedance matching for reflection was facilitated. The data rate of the proposed work is 15 Gb/s, and the data path power dissipation for the entire design is 20.3 mW. The measured energy efficiency is 1.35 pJ/bit, and the total area occupation is 0.008 mm2.

Original languageEnglish
Pages (from-to)2737-2741
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume69
Issue number6
DOIs
Publication statusPublished - 2022 Jun 1

Keywords

  • Asymmetric interface
  • CMOS
  • dynamic random-access memory (DRAM)
  • equalization
  • transmitter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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