Patent ID: 6844774

Claim:
Apparatus for providing well-matched source and sink currents, comprising: a) a number of parallel current paths, i) a first of which drives a first current mirror to mirror current to second and third of the parallel current paths; ii) the second of which provides well-matched source and sink currents as outputs; iii) the third of which is matched to the second; iv) a fourth and fifth of which each comprise a transistor of a current steering mechanism and a bias transistor; wherein a first transistor of the current steering mechanism is coupled in the fourth current path and is driven by feedback from the third current path; wherein a second transistor of the current steering mechanism is coupled in the fifth current path and is driven by a reference voltage; wherein the bias transistor of the fourth current path mirrors current to the first current path under control of the current steering mechanism; and wherein the bias transistor of the fifth current path mirrors current to the second and third current paths under control of the current steering mechanism; and b) a second current mirror, driven by a bias current, to mirror said bias current to each of the number of parallel current paths.