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:
May. 06, 2008
Filed:
Jan. 14, 2005
Ramsin M. Ziazadeh, San Jose, CA (US);
Ramsin M. Ziazadeh, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A driver for a vertical-cavity surface emitting laser (VCSEL) is provided that includes a bias current source, a modulation source, and a peaking control circuit. The bias current source is operable to generate a bias current for the VCSEL and an output voltage. The modulation current source is coupled to the bias current source by at least one switch and is operable to generate a modulation current for the VCSEL when the switch is closed. The peaking control circuit is coupled to the bias current source. The peaking control circuit is operable to receive the output voltage from the bias current source and to generate a driver output voltage for the VCSEL based on the output voltage. The driver output voltage has less peaking than the output voltage.