Patent ID: 9093130
Filing Date: 2015-07-28
Classification: G11C

Abstract:
1. A sense amplifier, comprising: a memory input stage circuit for receiving a cell current; a reference input stage circuit for receiving a reference current; an output stage circuit coupled to the memory and the reference input stage circuits, the output stage circuit having a latch, first and second transistors; and a shielding transistor unit electrically coupled with the reference input stage circuit and the output stage circuit; wherein the reference input stage circuit is controlled by the reference current for generating another reference current which flows through the shielding transistor unit; the reference input stage circuit comprises: a reference node; and a reference transistor, having a control node receiving a first reference voltage established by the reference current, an input node coupled to a power node, and an output node for outputting a second reference voltage to the reference node in response to the first reference voltage; and the shielding transistor unit comprises: a first shielding transistor, comprising a control end receiving a first bias voltage, a first output end coupled to the reference input stage circuit, and a second output end; and a second shielding transistor, comprising a control end receiving a second bias voltage, a first output end coupled to the second output end of the first shielding transistor, and a second output end coupled the reference input stage circuit.