Patent ID: 9111622
Filing Date: 2015-08-18
Classification: G11C

Abstract:
1. A method of reading data from a spin-torque magnetoresistive memory cell coupled to a bit line, the memory cell having resistance variation with applied voltage in a first state, and the memory cell having relatively constant resistance regardless of applied voltage in a second state, the method comprising: biasing a transistor to operate in a linear region, wherein the transistor is coupled to a mock bit line; providing a first applied voltage to the bit line and to the mock bit line; while the first applied voltage is provided, adjusting a gate voltage of the transistor such that resistance of the transistor matches resistance of the memory cell; after adjusting the gate voltage, providing a second applied voltage to the bit line and to the mock bit line; comparing a current difference between the bit line with the second applied voltage and the mock bit line with the second applied voltage; and determining whether the memory cell is in the first state or the second state in response to the comparison of the current difference.