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 paper 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
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • CMOS
  • Capacitors
  • Charge pumps
  • Clocks
  • Impedance
  • MOS devices
  • Transmitters
  • Voltage
  • asymmetric interface
  • dynamic randomaccess memory (DRAM)
  • equalization
  • transmitter.

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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