Patent ID: 8405451
Filing Date: 2013-03-26
Classification: G05F

Abstract:
1. A current source circuit comprising: a reference current source circuit configured to generate a reference current based on a first power supply voltage and a second power supply voltage; a reference voltage source circuit configured to generate a voltage proportional to a thermal voltage based on said reference current; a first transistor of a first conductive type which is connected between said reference voltage source circuit and said second power supply voltage and through which a first current flows; a second transistor of the first conductive type which has a gate applied with a voltage as a result of addition of the voltage generated by said reference voltage source circuit and a voltage between a source and a drain of said first transistor and through which a second current flows; a current source configured to supply a third current of a current value proportional to that of said first current; and a third transistor of a second conductive type complimentary to the first conductive type, wherein a difference current between said second current and said third current flows through said third transistor, wherein an output current is supplied based on said difference current.