Sensing margin enhancement technique utilizing boosted reference voltage for low-voltage and high-density dram

Suk Min Kim, Byungkyu Song, Seong Ook Jung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In the case of dynamic random access memory (DRAM) using a voltage latched sense amplifier, various offset voltage cancellation techniques have been studied to secure the sensing margin. However, as coupling noise and process variations increase with technology scaling, it is impossible to obtain a sufficient sensing margin only by using an offset voltage cancellation technique. In addition, offset voltage cancellation techniques have several problems, such as area overhead and sensing speed slowdown at a low supply voltage. In this paper, we propose a sense amplifier that maximizes the sensing margin by boosting the reference bitline voltage during the charge sharing operation and adopting the offset voltage cancellation technique. The sensing voltage difference of the proposed sense amplifier increases by 50% or more than that of the conventional offset cancellation (OC) sense amplifier at the low supply voltage of 0.9 V, which can improve not only the sensing speed by 2 ns but also the sensing yield by 11.8%. In addition, the proposed sense amplifier achieves a stable sensing yield with a larger cell array height and thus can compensate the area overhead of 44% caused by the OC technique by decreasing the overall cell array height.

Original languageEnglish
Article number8744261
Pages (from-to)2413-2422
Number of pages10
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume27
Issue number10
DOIs
Publication statusPublished - 2019 Oct

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering

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