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. 30, 2000
Filed:
Jun. 04, 1998
Applicant:
Inventor:
Anthony Kevin Brown, Kanata, CA;
Assignee:
Nortel Networks Corporation, Montreal, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
327563 ; 327 67 ; 327112 ; 326 89 ; 326126 ; 330260 ;
Abstract
A digital data driver includes a differential amplifier having transistors which operate as a push-pull amplifier in class C mode. The transistors are conductive or non-conductive and controlled in response to a differential data input signal. The driver provides current to a load resistor of an external equipment and the direction of the current flowing therein is reversed in response to the input data. The differential amplifier transistors are connected to other transistors which provide source impedance to the external equipment. The source impedance of the driver is a controllable characteristic impedance of e.g., 50 .OMEGA..