Patent ID: 8497710

Claim:
A low-offset current-sense amplifier, comprising: a sense amplifier having a first coupling end and a second coupling end; a first current supply unit being coupled to the first coupling end, and having a first transistor group and a first current output terminal; a second current supply unit being coupled to the second coupling end, and having a second transistor group and a second current output terminal; and a processing unit being coupled to the first and the second current supply unit; the processing unit controlling some transistors in the first and the second transistor group to on or off according to electric currents output from the first and the second current output terminal, respectively, wherein the first transistor group and the second transistor group further include a first switch group and a second switch group, respectively; and the processing unit compares the electric currents output from the first and the second current output terminal to obtain an average current value for controlling some transistors in the first and the second switch group to on or off.