Patent ID: 6518833
Filing Date: 2003-02-11
Classification: G05F

Abstract:
A method for providing a temperature compensated FET reference voltage, comprising:driving a first current across a first resistance and a first FET of a first size; driving a second current across a second FET of a second size, the second current being equal to the first current; driving a third current across a second resistance and a third FET of the second size, to generate a reference voltage across the second resistance and the third FET, wherein the third FET operates in a subthreshold region, wherein the third current is equal to the first current; and compensating for a temperature coefficient of the third FET to compensate the reference voltage such that the reference voltage is independent of temperature variation, wherein driving the first current comprises choosing a current using FETs of a different doping type than the first, second and third FETs.