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:
Mar. 30, 2021
Filed:
Aug. 03, 2018
Arm Limited, Cambridge, GB;
Subbayya Chowdary Yanamadala, Dallas, TX (US);
Mikael Yves Marie Rien, Bernin, FR;
ARM LIMITED, Cambridge, GB;
Abstract
A system with tamper detection can include at least one ring oscillator and a detection circuit coupled to the at least one ring oscillator to detect change in frequency greater than a tolerance. Each ring oscillator can include a plurality of inverters where at least one intermediate node coupling an output of one of the plurality of inverters and an input to another of the plurality of inverters is a sensing node of a plurality of sensing nodes for the system. Outputs from two or more ring oscillators can be compared and a signal to initiate a countermeasure response can be generated when the outputs have a difference greater than a tolerance value.