Patent ID: 7321507
Filing Date: 2008-01-22
Classification: G11C

Abstract:
1. An MRAM reference cell sub-array for providing a mid-point reference current to a plurality of sense amplifiers associated with an MRAM array comprising: a plurality of MRAM cells arranged in rows and columns; a plurality of bit lines, each bit line associated with a free magnetic layer of each MRAM cell of a column of the plurality of MRAM cells, and a coupling to connect the bit lines of pairs of the columns of the plurality of MRAM cells together, wherein a pair of the MRAM cells of said pair of columns are on a common row of said MRAM cells and a first of said pair of MRAM cells is programmed to a first magneto-resistive state and a second of said pair of MRAM cells is programmed to a second magneto-resistive state such that when one row of MRAM cells are selected for read, said pair of MRAM cells are placed in parallel to generate said mid-point reference current.