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:
Dec. 28, 2010
Filed:
Oct. 01, 2007
Kelly C. Casey, Flower Mound, TX (US);
Kelly C. Casey, Flower Mound, TX (US);
Littelfuse, Inc., Des Plaines, IL (US);
Abstract
A low capacitance overvoltage protection circuit () provides protection to a communication line (). A diode bridge () is connected to the communication line () so that overvoltages of both polarities pass through an overvoltage protection device () in one direction. A bias voltage supplyapplies a bias voltage across a semiconductor overvoltage protection device () through isolation resistors () to make the capacitance of the device () independent of changes in communication line voltages. When line voltages exceed the magnitude of the bias voltage, a blocking diode () prevents current from flowing through the bias voltage supply () in a reverse direction.