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:
Aug. 01, 2006
Filed:
Oct. 02, 2003
Randolph Bullock, Dryden, NY (US);
James R. Del Signore, Trumansburg, NY (US);
Randolph Bullock, Dryden, NY (US);
James R. Del Signore, Trumansburg, NY (US);
Axiohm Transaction Solutions, Inc., Ithaca, NY (US);
Abstract
A USB interface having improved EMC immunity where the D+, D−, and USB ground lines each pass through a common mode choke. The USBV line is AC coupled to the USB ground line outside the choke and routed through a high impedance into the circuit while maintaining the integrity of the signal. In addition, bypass capacitors, such as Tantalum bypass capacitors, and aV Transorb device are added to theV power supply of the controller, and all unused pins are terminated to reduce unwanted ringing transients in the controller leadframe. In addition, small capacitors within the capacitive loading specification allowed by the USB-IF are positioned next to the controller on each data line.