Patent ID: 11947672
Assignee: NXP B.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. A method for detecting a voltage glitch, the method comprising:
counting in parallel state changes from each node of a ring oscillator to generate a plurality of count values,
wherein the ring oscillator is separate from a set of counters configured to perform the counting and includes a plurality of series-connected inverting stages connected in a ring wherein the each node is between each pair of inverting stages,
wherein each of the plurality of count values corresponds to each state change from one of the nodes of the ring oscillator,
capturing the plurality of count values in synchronization with a system clock of the digital circuit;
combining the plurality of count values to produce a combined result;
comparing the combined result with a reference value; and
generating a voltage glitch indication signal if the comparison is outside of a threshold range.