The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 2008
Filed:
Jan. 23, 2007
David Kunst, Cupertino, CA (US);
Steven Martinez, Tucson, AZ (US);
Robert James Lewandowski, Shoreline, WA (US);
Peter Chambers, Phoenix, AZ (US);
Joseph James Judkins, Austin, TX (US);
Luis Torres, Rolling Meadows, IL (US);
Thomas A. Lindsay, Brier, WA (US);
David Kunst, Cupertino, CA (US);
Steven Martinez, Tucson, AZ (US);
Robert James Lewandowski, Shoreline, WA (US);
Peter Chambers, Phoenix, AZ (US);
Joseph James Judkins, Austin, TX (US);
Luis Torres, Rolling Meadows, IL (US);
Thomas A. Lindsay, Brier, WA (US);
Micrel, Incorporated, San Jose, CA (US);
Abstract
An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensation is provided by a second means, preferably by a digital-to-analog converter that receives an input signal proportional to a sensed control system parameter. The control system includes an operational amplifier having a first input coupled to sense output power, and a second input coupled to a DAC to provide finer resolution control. Memory can store system parameter or system parameter variations that can be coupled to the DAC and/or variable resistor to enhance system stability over ambient variations.