A 10 Gbits/s/pin DFE-Less Graphics DRAM Interface with Adaptive-Bandwidth PLL for Avoiding Noise Interference and CIJ Reduction Technique

Junyoung Song, Hyun Woo Lee, Sewook Hwang, Chulwoo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

A 10 Gbits/s/pin graphics DRAM interface is developed in 65-nm CMOS technology. Several design techniques are proposed for high-speed operation in a noisy environment. A fast precharging data sampler guarantees high-speed sampling without the need for a decision feedback equalizer. In order to increase the data sampling margin, the PLL bandwidth is optimized depending on the system noises, which reduces the clock jitter by up to 55.1%. The crosstalk-induced jitter (CIJ) reduction technique suppresses the DQs jitter by employing the suggested training sequence for the GDDR5 interface. Pre-and de-emphasis are merged in one auxiliary driver. This chip operates at 10 Gbits/s/pin and exhibits a data eye opening of 0.78 UI with the CIJ reduction technique. The power consumptions of the TX and RX are 8.28 and 5.5 pJ/b/channel, respectively.

Original languageEnglish
Article number7517393
Pages (from-to)344-353
Number of pages10
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume25
Issue number1
DOIs
Publication statusPublished - 2017 Jan
Externally publishedYes

Keywords

  • Adaptive-bandwidth PLL
  • crosstalk-induced jitter (CIJ) reduction
  • fast precharging sampler (FP-sampler)
  • graphics DRAM interface
  • intersymbol interference (ISI) reduction
  • pre-and de-emphasis
  • receiver
  • training sequence

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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