Patent ID: 6597598
Filing Date: 2003-07-22
Classification: G11C

Abstract:
An information storage device, comprising:a resistive cross point memory cell array; a plurality of word lines; a plurality of bit lines, wherein a group of memory cells are connected to a common word line and each memory cell in the group is connected to a single bit line; and a differential sensing amplifier, coupled to the memory cell array, comprising: first and second input nodes, the first input node selectively coupled to one of the plurality of bit lines connected to a reference cell within the cell array and the second input node selectively coupled to a sense cell within the group of memory cells common to a given word line; a first preamplifier coupled to the first input node; a second preamplifier coupled to the second input node; and a charge injection amplifier, coupled to an output from the first preamplifier and an output from the second preamplifier, operable to determine a resistive state of the sense cell as compared to a resistive state of the reference cell during a read operation.