Patent ID: 8917536
Filing Date: 2014-12-23
Classification: G11C

Abstract:
1. An adaptive reference circuit for reading a magnetic memory cell, comprising: a) a magnetic memory cell connected to a data input of a sense amplifier; b) a reference circuit formed by a plurality of pairs of magnetic memory cells, numbering at least four memory cells, and coupled in parallel to a reference input of the sense amplifier, wherein an impedance value of the plurality of pairs of magnetic memory cells averaged together to provide an adaptive reference signal for reference input to the sense amplifier; c) each of the magnetic memory cells of said reference circuit programmed to adjust an average value of the reference circuit, wherein the adaptive reference signal formed from memory cells designated as reference cells and individually programmed to adjust to variations in a separation between parallel and anti-parallel states of memory cells; and d) said reference circuit programmed to optimize read performance of the magnetic memory cell and to correct for a change in temperature dependence in the reference circuit.