Dual-output current driver

摘要

A dual-output current driver includes a pair of output stages that provide output current to various devices such as LEDs and laser diodes. An output-stage selector circuit that includes a differential pair is arranged to activate one of the output stages at a time. A pair of push-pull circuits may be employed to drive the differential pair such that high speed switching is possible. A single-ended to differential conversion circuit controls the push-pull circuits. The selected output stage receives a drive current from a differential pair circuit in a current driver circuit. The current driver circuit includes another pair of push-pull circuits that drive its differential pair circuit, and one or more additional differential circuits that are arranged to activate the push-pull circuits. The various differential pair circuits in the current driver circuit can be arranged to provide phase reversal, or modulation of the drive current in the output stages.