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:
Feb. 17, 2004
Filed:
Dec. 15, 2000
Applicant:
Inventors:
Jeffrey C. Cho, Northborough, MA (US);
John F. Zettler, Stow, MA (US);
Assignee:
Adaptive Instruments Corporation, Hudson, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 1/26 ; H04M 1/100 ;
U.S. Cl.
CPC ...
G06F 1/26 ; H04M 1/100 ;
Abstract
A bus powered device includes a signal processing control circuit connected to and powered by a bus at a predetermined operating current and a bus current modulator circuit interconnected in series with a signal processing control circuit to the bus for providing a bipolar communication signal having an average current of substantially zero; the total series current of both the circuits is only the current required by the signal processing control circuit or the absolute value of the most negative current excursion during communication, whichever is greater.