System and method for providing an input voltage invariant current source

摘要

A system and method is disclosed for providing a current source that has an approximately constant value of output current over a range of supply voltages. The current source of the invention comprises a plurality of peaking current source circuits coupled in parallel. Each of the plurality of peaking current source circuits provides a separate output current for a given value of supply voltage. The separate output currents of the peaking current source circuits are added together to provide a total output current for a given value of supply voltage. The total output current remains approximately constant for each value of supply voltage within a range of supply voltages.