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research article

Multi-level wordline driver for robust SRAM design in nano-scale CMOS technology

Moradi, Farshad
•
Panagopoulos, Georgios
•
Karakonstantis, Georgios  
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2014
Microelectronics Journal

In this paper, a multi-level wordline driver scheme is presented to improve 6T-SRAM read and write stability. The proposed wordline driver generates a shaped pulse during the read mode and a boosted wordline during the write mode. During read, the shaped pulse is tuned at nominal voltage for a short period of time, whereas for the remaining access time, the wordline voltage is reduced to save the power consumption of the cell. This shaped wordline pulse results in improved read noise margin without any degradation in access time for small wordline load. The improvement is explained by examining the dynamic and nonlinear behavior of the SRAM cell. Furthermore, during the hold mode, for a short time (depending on the size of boosting capacitance), wordline voltage becomes negative and charges up to zero after a specific time that results in a lower leakage current compared to conventional SRAM. The proposed technique results in at least 2 x improvement in read noise margin while it improves write margin by 3 x for lower supply voltages than 0.7 V. The leakage power for the proposed SRAM is reduced by 2% while the total power is improved by 3% in the worst case scenario for an SRAM array. The main advantage of the proposed wordline driver is the improvement of dynamic noise margin with less than 2.5% penalty in area. TSMC 65 nm technology models are used for simulations. (C) 2013 Elsevier Ltd. All rights reserved.

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Type
research article
DOI
10.1016/j.mejo.2013.09.009
Web of Science ID

WOS:000331025600003

Author(s)
Moradi, Farshad
Panagopoulos, Georgios
Karakonstantis, Georgios  
Farkhani, Hooman
Wisland, Dag T.
Madsen, Jens K.
Mahmoodi, Hamid
Roy, Kaushik
Date Issued

2014

Publisher

Elsevier

Published in
Microelectronics Journal
Volume

45

Issue

1

Start page

23

End page

34

Subjects

SRAM

•

Wordline driver

•

Low-power

•

Leakage-power

•

Digital circuits

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
TCL  
Available on Infoscience
April 2, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/102499
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