Highly Reliable Two-Step Charge-Pump Read Scheme for 1.5 F2/Bit Nonlinear Sub-Teraohm 0TNR Vertical ReRAM

Tsai Kan Chien, Lih Yih Chiou, Chi Shian Chang, Jing Yu Huang, Chung Han Wu, Heng Yuan Lee, Shyh Shyuan Sheu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Among the emerging types of memory, resistive random-access memory (ReRAM) units offer faster write speeds and consume less power than those of flash memory units. With the advancement of 3-D stack technology, 3-D nonvolatile memories (NVMs) are under active development to satisfy the requirements of new applications. This brief proposes a 1.5 F2/bit nonlinear sub-teraohm vertical ReRAM (V-ReRAM) and a sensing ultrahigh-resistance read scheme that not only accurately senses sub-picoampere currents but also reduces sneak current effects. A 2-Kb V-ReRAM macro unit was fabricated using a 0.15-μ m CMOS process and the Industrial Technology Research Institute's zero-transistor-four-ReRAM V-ReRAM back-end-of-line process. The proposed read scheme increased the sensing margin by eight times when compared with the current-mirror type, a commonly used read scheme for NVMs. Additionally, the memory bit size was smaller than one-transistor-N-ReRAM V-ReRAM.

Original languageEnglish
Article number8123866
Pages (from-to)1234-1238
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number9
Publication statusPublished - 2018 Sep

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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