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:
Apr. 13, 1993
Filed:
Mar. 24, 1992
William L Geller, Foster City, CA (US);
Raynet Corporation, Menlo Park, CA (US);
Abstract
A transimpedance front end is provided for an optical receiver which includes a photodetector coupled optically to an optical fiber for receiving optical signals over the fiber and connected electrically to the front end. The front end comprises a buffer amplifier connected to the photodetector, a first amplifier selectively connected to the buffer through a first switch and through a first, high value feedback resistor in order to define a first mode low optical signal level amplifier configuration, a second amplifier selectively connected to the buffer through a second switch and through a second, switched low value resistor to define a second mode high optical signal level amplifier configuration, and an optical level sensing and switching control circuit connected to the photodetector for sensing incoming optical signal level and for switching between the first and second amplifier configurations as a function thereof.