Patent ID: 7394295
Filing Date: 2008-07-01
Classification: G11C,H03F

Abstract:
1. A sense amplifier coupled to a memory cell, comprising: a first current mirror unit coupled to a high voltage source outputting a first current via a first output and a second current via a second output based on a first reference current, wherein the first current is equal to the first reference current and the second current is two times the first current; a second current mirror unit coupled to the high voltage source outputting a reference current via a third output based on a second reference current, wherein the reference current is equal to the second reference current; a first impedor coupled to the second output and a low voltage source, having a first impedance; a second impedor coupled to the third output and the low voltage source having the first impedance; a third current mirror unit coupled to the first output, the second output and the third output, taking the first current as a third reference current of the third current mirror to make the current passing through the first impedor equal to the first current and the current passing through the second impedor equal to a fourth current.