Patent ID: 7046077
Filing Date: 2006-05-16
Classification: G05F

Abstract:
1. A current source circuit, comprising: a reference current source supplying a reference current; a first transistor group connected in series to the reference current source, and convening the reference current into a voltage; a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough; an error amplifier receiving a voltage generated in the first transistor group at one input terminal, and comparing the voltage at the one input terminal with a voltage supplied to the other input terminal; a second transistor driven with an output voltage of the error amplifier; a third transistor driven with the output voltage of the error amplifier, and allowing an output current to flow therethrough in a direction opposite to the output current of the first transistor, such that an outflow current flowing out a first output terminal can be set equal to an inflow current flowing into a second output terminal; and a second transistor group connected in series to the second transistor, and converting a current flowing through the second transistor into a voltage to supply the voltage to the other input terminal of the error amplifier, the second transistor group being independent from the first transistor group.