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. 14, 2002
Filed:
Sep. 02, 1999
Robert Mores, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a system for the transmission of logic levels via a bus the recessive level, being of higher impedance in comparison with the dominant level, is not adjusted by means of a resistor but by means of a termination arrangement with three break points in the current/voltage diagram. In the third quadrant of the current/voltage diagram this termination arrangement has a resistance which is higher than that of a lead terminated by means of a linear resistor. In the first quadrant the rise of the characteristic up to a voltage below a receiving threshold is steeper than in the case of termination by means of a resistor. Subsequently, in the first quadrant the characteristic is subject to a current limitation which is effective from a voltage below the receiving threshold to a value beyond the working point of the dominant driver. Beyond the working point of the dominant driver the current limitation is removed again, so that the rise is steeper than in the case of termination by means of a resistor. This termination arrangement optimizes the ratio of the value of the driver currents, and the associated radiation via the bus, to the speed at which a level is adjusted on the bus. Moreover, the tolerance in respect of ground offset is thus improved and also the resistance to radiation.