Dual-output current driver

Details Dual-output current driver Dual-output current driver

2006-11-14

2006-11-14

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C330S288000

Reexamination Certificate

active

07135894

ABSTRACT:
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.

REFERENCES:
patent: 5929664 (1999-07-01), Alleven
patent: 6836144 (2004-12-01), Bui et al.
patent: 6909316 (2005-06-01), Owens et al.
élantec Press Release, “EL6285C 3-channel DVD/CD Dual Writer LDD; and EL6219C 4-channel DVD/DC Dual Writer LDD,” Mar. 18, 2002, 2 pages.
élantec, “EL6290C—Product Brief Laser Diode Driver with Waveform Generator,” May 12, 2000, 2 pages.

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