Patent ID: 8385147
Filing Date: 2013-02-26
Classification: G11C,H01L

Abstract:
1. A sensing circuit comprising: a reference column including a reference voltage node, a reference memory cell, a first MOS transistor, and a first differential threshold MOS transistor; and a plurality of data columns, each coupled to a respective data voltage node, in parallel with the reference column, wherein each data column comprises a data memory cell, a second MOS transistor, and a second differential threshold MOS transistor; wherein one or more of the differential threshold transistors are transistors that each have a gate-to-source threshold voltage that differs from a gate-to-drain threshold voltage; wherein one or more of the differential threshold transistors comprises: wherein each insulating portion characterizes a threshold voltage between the gate and the first region or the second region adjacent each insulating portion; and wherein the first insulating portion is fabricated with varying dimension including a first thickness different than a second thickness of the second insulating portion to provide a first threshold voltage that differs from a second threshold voltage associated with the opposed insulating portion.