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:
Nov. 08, 2005
Filed:
Nov. 29, 2001
André Weimerskirch, Eppstein, DE;
André Weimerskirch, Eppstein, DE;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method and apparatus are disclosed for preventing noise from influencing a random number generator that is based on the meta-stable behavior of flip-flops. External noise will affect multiple flip-flops in a larger random number generator circuit in the same way, since they are physically close. Thus, the ability to influence the operation of a random number generator using external noise is reduced by incorporating a plurality of flip-flops, referred to herein as core random elements, in a single random number generator. If one of the core random elements in a random number generator is influenced by noise, all of the core random elements will be influenced by the noise. Thus, if all (or most) of the core random elements issue a random bit at the same time, there is a possibility that the random number generator was influenced by noise, and all the issued bits are discarded. One or more mechanisms are incorporated into the random number generator to ensure that a random bit is not generated when a plurality of the core random elements generate a bit at the same time.