Journal
NANOTECHNOLOGY
Volume 27, Issue 48, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/48/485201
Keywords
RRAM; cross bar; sneak current; two-port current-mode sensing
Funding
- Global Research Laboratory Program of the Ministry of Science, ICT, and Future Planning [2012040157]
- National Research Foundation of Korea (NRF) from the Republic of Korea [NRF-2014R1A2A1A10052979]
- National Research Foundation of Korea [2014R1A2A1A10052979, 2012K1A1A2040157] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper describes a novel readout scheme that enables the complete cancellation of sneak currents in resistive switching random-access memory (RRAM) crossbar array. The current-mode readout is employed in the proposed readout, and a few critical advantages of the current-mode readout for crossbar RRAM are elucidated in this paper. The proposed scheme is based on a floating readout scheme for low power consumption, and one more sensing port is introduced using an additional reference word line. From the additional port, information on the sneak current amount is collected, and simple current-mode arithmetic operations are implemented to cancel out the sneak current from the sensing current. In addition, a simple method of handling the overestimated-sneak-current issue is described. The proposed scheme is verified using HSPICE simulation. Moreover, an example of a current-mode sense amplifier realizing the proposed cancelling technique is presented. The proposed sense amplifier can be implemented with less hardware overhead compared to the previous works.
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