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. 14, 2004
Filed:
Aug. 05, 2002
Gideon Z. Romm, Bronx, NY (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
A driver circuit for an opto-electrical transmitter includes a digital feedback loop. A counter in the feedback loop maintains a count that controls a bias current output to the opto-electrical transmitter. A first fault activation circuit in the driver activates a fault signal that disables the driver when the count causes an overflow or underflow. The overflow/underflow can correspond to the input range of an ADC that converts the count into an analog signal to an output amplifier or to the range of the counter. A second fault activation signal times the duration of any periods during which a digital parameter of the driver is outside a target range. The digital parameter can be e a measured monitor current or the count that controls the output amplifier.