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:
Jun. 03, 2008
Filed:
Apr. 07, 2006
Alexander Fairgrieve, Menlo Park, CA (US);
D. Stuart Smith, San Jose, CA (US);
Theodore D. Rees, Mountain View, CA (US);
Bill R. Tang, San Jose, CA (US);
Alexander Fairgrieve, Menlo Park, CA (US);
D. Stuart Smith, San Jose, CA (US);
Theodore D. Rees, Mountain View, CA (US);
Bill R. Tang, San Jose, CA (US);
Elantec Semiconductor, Inc., Milpitas, CA (US);
Abstract
Methods and system are provided for automatic power control of a laser diode, e.g., in a laser driver. In accordance with an embodiment of the present invention, a power controller includes a detector circuit adapted to detect the output of the laser diode and to produce a measured output therefrom. A comparator compares a desired output to the measured output, and produces an error signal therefrom. The error signal is provided to an integrator circuit that produces an integrated error signal. At least one digital-to-analog converter (DAC) uses the integrated error signal to produce a current drive signal that drives the laser diode.