Patent ID: 7015744

Claim:
A self-regulating current source comprising: a current mirror coupled to the positive power supply voltage and comprising a first current output terminal and a second current output terminal; a first NMOS transistor having a control terminal coupled to the first current output terminal of the current mirror, a first current handling terminal coupled to a first node and a second current handling terminal coupled to a negative power supply voltage; a second NMOS transistor having a control terminal coupled to the first node, a first current handling terminal coupled to a second node and a second current handling terminal coupled to the negative power supply voltage, the first NMOS transistor and the second NMOS transistor being of unequal sizes; a third NMOS transistor having a control terminal coupled to the first current output terminal of the current mirror, a first current handling terminal coupled to the second current output terminal of the current mirror and a second current handling terminal coupled to the second node; and a first resistor coupled between the first current output terminal of the current mirror and the first node, wherein a first regulated current is provided at the first current output terminal of the current mirror and a second regulated current is provided at the second current output terminal of the current mirror, the plurality of output currents being derived from and proportional to the first or second regulated current.