Patent ID: 8208330

Claim:
A sense amplifier, for comparing a cell current and a reference current, the sense amplifier comprising: a memory input stage circuit, comprising: a first transistor, having a control node receiving a first sense voltage established by the cell current, a first input node coupled to a power node, and a first output node for outputting a second sense voltage to a sense node in response to the first sense voltage; a reference input stage circuit, comprising: a second transistor, having a control node receiving a first reference voltage established by the reference current, a second input node coupled to the power node, and a second output node for outputting a second reference voltage to a reference node in response to the first reference voltage; an output stage circuit, obtaining a sense result in response to the second reference voltage and the second sense voltage; and a first shielding circuit, provided in one of a location between the second output node and the reference node for shielding the second output node from the reference node and a location between the first output node and the sense node for shielding the first output node from the sense node.