Patent ID: 8854121

Claim:
An integrated circuit having a differential current circuit for generating a source current at a source current node and a sink current at a sink current node, the differential current circuit comprising: a constant-current generator adapted to generate a constant current; a dependent device such that (i) one of the source current and the sink current is the constant current and (ii) the other of the source current and the sink current is a dependent current through the dependent device; and a switched capacitor circuit connected to a gate of the dependent device, wherein the switched capacitor circuit is configured to be operated to (i) charge at least one capacitor of the switched capacitor circuit, (ii) use the at least one charged capacitor to adjust a gate voltage of the dependent device to drive the dependent current through the dependent device to be equal to the constant current through the constant-current generator, and (iii) direct the dependent and constant currents through the source and sink current nodes.