Current-mode sense amplifier and sense amplifying method

摘要

A current-mode sense amplifier comprises a first current mirror, a second current mirror and an amplifying circuit. The first current mirror outputs a cell current to a memory cell and duplicates the cell current to generate a mirrored cell current. The second current mirror outputs a reference current to the reference cell and duplicates the reference current to generate a mirrored reference current. The amplifying circuit comprises a first switch, second switch, third switch and fourth switch. The first switch has first and second terminals for respectively receiving the mirrored cell and reference currents. The second and third switches have first terminals respectively coupled to the first and second terminals of the first switch, and control terminals respectively coupled to the second and first terminals of the first switch. The fourth switch is connected to second terminals of the second and third switches.