公开(公告)号：US20220284099A1

公开(公告)日：2022-09-08

申请号：US17189329

申请日：2021-03-02

Applicant: NXP B.V.

Inventor： Andreas Bernardus Maria JANSMAN ,  Andreas Lentz

IPC: G06F21/56 ,  H03K3/03 ,  H03K21/02 ,  H03K3/037 ,  G06F1/28 ,  G06F1/3296 ,  G06F21/81

Abstract: A voltage glitch detector includes a ring oscillator, a plurality of counters, a combined result circuit, and a result evaluation circuit. The ring oscillator includes a plurality of series-connected stages. An output of a last stage of the ring oscillator is coupled to an input of a first stage of the ring oscillator. Each counter of the plurality of counters has an input coupled to a node located between two stages of the plurality of series-connected stages. The combined result circuit is coupled to each of the plurality of counters. The combined result circuit combines the count values received from each counter of the plurality of counters to provide a combined result. The result evaluation circuit is coupled to compare the combined result with a reference value to determine when a voltage glitch is detected.

公开(公告)号：US20210396789A1

公开(公告)日：2021-12-23

申请号：US16908338

申请日：2020-06-22

Applicant: NXP B.V.

Inventor： Andreas Lentz ,  Andreas Bernardus Maria Jansman

IPC: G01R19/165 ,  H03K5/1252 ,  G06K19/073

Abstract: An integrated circuit for hardware security comprises a voltage glitch detection processing system comprising an oscillator circuit that generates and outputs a local oscillator clock which is a function of a supply voltage; a counter clocked by the oscillator circuit to generate at least one count value; and a capture section that synchronizes the at least one count value into a system clock domain for detecting a voltage glitch in the supply voltage.