Nonvolatile memory device with sense amplifier securing reading margin

摘要

In a sense amplifier, local I/O lines are maintained at a predetermined voltage by transistors. Transistors forming a current mirror supply an operating current according to a passing current which flows through transistors, to sense nodes. Transistors forming a current mirror extract an operating current according to the passing current which flows through transistors, from sense nodes. As a result, a voltage difference is generated in sense nodes in accordance with the operating current difference.