Title:
SELF REFERENCING SENSE AMPLIFIER FOR SPIN TORQUE MRAM
Document Type and Number:
WIPO Patent Application WO/2013/169593
Kind Code:
A3
Abstract:
Circuitry and a method provide self-referenced sensing of a resistive memory cell by using its characteristic of resistance variation with applied voltage in one state versus a relatively constant resistance regardless of the applied voltage in its opposite state. Based on an initial bias state with equalized resistances, a current comparison at a second bias state between a mock bit line and a bit line is used to determine the state of the memory cell, since a significant difference in current implies that the memory cell state has a significant voltage coefficient of resistance. An offset current applied to the mock bit line optionally may be used to provide symmetry and greater sensing margin.
Inventors:
SUBRAMANIAN CHITRA (US)
ALAM SYED M (US)
ALAM SYED M (US)
Application Number:
PCT/US2013/039466
Publication Date:
January 09, 2014
Filing Date:
May 03, 2013
Export Citation:
Assignee:
SUBRAMANIAN CHITRA (US)
ALAM SYED M (US)
EVERSPIN TECHNOLOGIES INC (US)
ALAM SYED M (US)
EVERSPIN TECHNOLOGIES INC (US)
International Classes:
G11C11/00; H01L29/82
Foreign References:
| US7280423B1 | 2007-10-09 | |||
| US20100188894A1 | 2010-07-29 | |||
| US20090010045A1 | 2009-01-08 | |||
| US20100254194A1 | 2010-10-07 | |||
| US20080137430A1 | 2008-06-12 |
Attorney, Agent or Firm:
KOCH, William E. (P.C.7010 E. Cochise Roa, Scottsdale Arizona, US)
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