Write current self-configuration scheme for MRAM yield improvement

Ching Yi Chen, Sheng Hung Wang, Cheng Wen Wu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Magnetic random access memory (MRAM) is an emerging nonvolatile memory, which is widely studied for its high speed, high density, small cell size, and almost unlimited endurance. However, for deep-submicrometer process technologies, significant variation in the MRAM cells' operating condition results in write failures in cells and reduces the production yield. Memory designers have to characterize failed MRAM chips to find a suitable current level for reconfiguring their write current, which is time consuming. In this paper, we propose an efficient operating-current search method and the corresponding built-in circuit for toggle MRAM, which can rapidly find the minimal operating current. With the built-in search circuit, an MRAM chip can dynamically configure its write current through few tester channels. The resulting chip works correctly and consumes lower power. Production yield, thus, can be increased while the test cost is greatly reduced. We also present a generator of the circuit, which determines the circuit parameters according to the memory specifications and user requirements, and automatically generates the corresponding modules.

Original languageEnglish
Article number6255805
Pages (from-to)1260-1270
Number of pages11
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Issue number7
Publication statusPublished - 2013 Jan 1

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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