Supply glitch detector circuit and method for glitch detection

A glitch detection circuit for detecting a glitch on a digital supply, the glitch detection circuit comprising:

• a glitch sense threshold generator arranged to generate a positive glitch threshold signal and a negative glitch threshold signal using the digital supply;
• a path delay circuit coupled to the glitch sense threshold generator and comprising a first path and a second path located in parallel, wherein the first path provides a first output of a slow signal path of the digital supply to be detected that is used as the positive glitch threshold signal and the second path provides a second output of a slow signal path of the digital supply to be detected that is used as the negative glitch threshold signal;
• and
• a comparator circuit coupled to the path delay circuit and arranged to receive the digital supply to be detected and respectively compare the digital supply to be detected with the first output of a slow signal path and the second output of a slow signal path;
• wherein an output of the comparator circuit provides an indication of a power glitch on the digital supply in response to a comparison by the comparator circuit of the digital supply to be detected with at least one of:
• the positive glitch threshold signal, the negative glitch threshold signal.