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:
Jan. 21, 2003
John W. Fattaruso, Dallas, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The laser driver circuit includes an array of differential pairs and . Each one of the differential pairs is coupled to a corresponding tail current source and . The total modulation current for the laser driver circuit is developed as the sum of the output current from the array of differential pairs and . Each of the tail current sources and generates a subrange of the total range of modulation current. The tail current in a given differential pair will then only vary over a small subrange of the total modulation current range, and the device size in each pair may be optimized to keep the emitter current density near the level that gives optimum bandwidth. This is equivalent to electrically increasing the emitter area of the composite differential pair as the total modulation current is increased, keeping current density approximately constant at its optimal level.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile