Redundant monitoring for voltage regulator

A method comprising:

• receiving, by circuitry, a supply voltage from a voltage source;
• generating, by the circuity, from the supply voltage, a first voltage at a first voltage rail that is less than the supply voltage;
• receiving, by the circuitry, the first voltage from the first voltage rail;
• generating, by the circuitry, from the first voltage, a second voltage at a second voltage rail that is less than the first voltage;
• generating, by the circuitry, a first warning signal when the first voltage at the first voltage rail exceeds a first threshold or when a first testing voltage exceeds the first threshold;
• and
• generating, by the circuitry, a second warning signal when the second voltage at the second voltage rail exceeds a second threshold or when a second testing voltage exceeds the second threshold, wherein the second threshold is less than the first threshold.

A system comprising:

• a voltage source configured to output a supply voltage;
• a first regulation module configured to receive the supply voltage from the voltage source and generate, from the supply voltage, a first voltage at a first voltage rail that is less than the supply voltage;
• a second regulation module configured to receive the first voltage from the first voltage rail and to generate, from the first voltage, a second voltage at a second voltage rail that is less than the first voltage;
• a load coupled to the second voltage rail;
• a first monitoring module configured to generate a first warning signal when the first voltage at the first voltage rail exceeds a first threshold and to generate the first warning signal when a first testing voltage exceeds the first threshold;
• a second monitoring module configured to generate a second warning signal when the second voltage at the second voltage rail exceeds a second threshold and to generate the second warning signal when a second testing voltage exceeds the second threshold, wherein the second threshold is less than the first threshold;
• and
• a controller configured to receive an indication of the first warning signal and the second warning signal.