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

Claim 11:
12. An integrated circuit comprising:
a digital circuit; and
a voltage glitch detection circuit for detecting a voltage glitch in a supply voltage provided to the digital circuit, the voltage glitch detection circuit comprising:
a ring oscillator having a plurality of stages connected in a ring with an output node located at an output of each of the plurality of stages;
a plurality of counters, wherein each counter of the plurality of counters has an input coupled to an output node of a corresponding stage of the plurality of stages;
a combined result circuit coupled to an output of each counter of the plurality of counters, wherein the combined result circuit combines counter values from the plurality of counters for a predetermined time period to generate a combined result value; and
a result evaluation circuit having a first input coupled to receive the combined result value, and a second input coupled to receive a reference value, and an output for providing an error signal in response to the combined result count value failing to compare favorably with the reference value;
wherein the plurality of counters further comprises a first counter and a second counter coupled to a same node located between two stages of the plurality of stages, wherein the first counter triggers upon receiving a positive clock edge at the same node and the second counter triggers upon a receiving a negative edge at the same node.