Patent ID: 7522002
Filing Date: 2009-04-21
Classification: G09G,H03F

Abstract:
1. A current-mirror circuit including: a first current-mirror stage including a diode-connected current-mirror transistor of a first conductivity type driven by a current source coupled to a driven current-mirror transistor of the first conductivity type; a second current-mirror stage including a diode-connected current-mirror transistor of a second conductivity type driven by current through the driven current-mirror transistor of the first conductivity type and coupled to a driven current-mirror transistor of the second conductivity type; a load coupled to the driven current-mirror transistor of the second conductivity type; a first bias current source coupled to the diode-connected current-mirror transistor of the first conductivity type to cause a bias current to flow through the diode-connected current-mirror transistor of the first conductivity type; and a second bias current source coupled to one of the diode-connected current-mirror transistor of a second conductivity type and the driven current-mirror transistor of a second conductivity type so as to subtract the bias current from current flowing in the load.