Digital system for the detection of variations in operating conditions of an integrated circuit

Patent metadata

Field	Value
Publication number	US-9303953-B2
Application number	US-201313757931-A
Country	US
Kind code	B2
Filing date	Feb 4, 2013
Priority date	Mar 15, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A system for detecting tamper events in a digital circuit by having a Critical Path Replica (CPR) circuit operable in parallel with the circuit being monitored, and adjusted to generate a timing violation if the operating parameters of the circuit change to be outside the normal operating parameters. The critical path replica circuit is adjusted to generate a timing violation before the actual circuit being monitored fails due to the changed operating parameters.

First claim

What is claimed is:

1. A tamper detection system comprising:
a launch clock replica circuit receiving a clock signal at an input and generating a launch clock signal at an output;
a waveform generator register having a latch input connected to said output of said launch clock replica, an input and an output;
an inverter having an input connected to said output of said waveform generator and an output connected to said input of said waveform generator;
a critical path replica…

Assignees

• Texas Instruments Inc

Inventors

• Wallace William C
• Anand Alok
• Srivaths Ravi
• Kumar Chillara Kiran
• Koityar Aruna

Classifications

• H10W42/405 Primary

  Electricity · mapped topic

• Y10T29/49826

  Cross-Sectional Technologies · mapped topic

• F41G1/387

  Mechanical Engineering · mapped topic

• F41G1/38 Primary

  Mechanical Engineering · mapped topic

• G05B1/01

  Physics · mapped topic