Patent ID: 7869253
Filing Date: 2011-01-11
Classification: B82Y,G11C

Abstract:
1. A memory state determining device determining a memory state of a resistive memory cell, the device comprising: a voltage supplying unit generating a voltage between a first electrode and a second electrode of the resistive memory cell, wherein an active material is arranged between the first electrode and the second electrode; and a voltage determining unit determining a voltage change occurring during a charge or a discharge of a read capacity of the resistive memory cell via the active material, the voltage change representing the memory state to be detected, wherein the voltage determining unit samples a voltage of the second electrode at a sampling time at which a difference between the voltage of the second electrode and at least one reference voltage lies above a predetermined voltage threshold value; and wherein each voltage adaptation function of a plurality of voltage adaptation functions is assigned to one of a plurality of possible memory states of the resistive memory cell, each voltage adaptation function reflecting a respective adjusting process of the voltage of the second electrode to the voltage of the first electrode, and each sampling time of a plurality of sampling times is assigned to one of the plurality of voltage adaptation functions each sampling time of the a plurality of sampling times being chosen such that a difference between each of the plurality of voltage adaptation functions and the at least one reference voltage is larger than the predetermined voltage threshold value.