Patent ID: 8854113
Filing Date: 2014-10-07
Classification: G05F

Abstract:
1. A method comprising: receiving a first current source current at a first node; receiving a first current mirror reference current from a first current mirror through a first switch at the first node, the first switch coupled to the first node and having a switch configuration comprising at least one of an open configuration or a closed configuration; receiving a signal second current mirror reference current from a second current mirror through a second switch at a second node, the second switch coupled to the second node and having the switch configuration; controlling the switch configuration of the first switch and the second switch via a discrete pulse density modulated output generated by a sigma delta modulator, a sigma delta modulator having an input and an output, the input coupled to the first node and the output coupled to the first switch and the second switch, the discrete pulse density modulated output represents a first current source current as a function of the first current mirror current; receiving a second current source current at the second node, wherein the second current mirror reference current subtracts at least a portion of the second current source current at the second node.