On-die voltage noise monitor for supply noise detection utilizing controllable resistors for threshold level programming

A method for monitoring supply noise from a power source using a voltage noise monitor (VNM), comprising:

• receiving a sense voltage (Vsense) from a Vsense circuit of one or more Vsense circuits, wherein the VNM comprises analog circuitry that comprises Vsense circuitry and one or more comparators, wherein the Vsense circuitry comprises the one or more Vsense circuits, wherein each of the one or more Vsense circuits comprises a controlled resistor that is tunable based on threshold information from a micro-processor, and wherein each of the one or more Vsense circuits outputs a Vsense based on a resistance of the controlled resistor and a supply voltage from the power source;
• receiving the reference voltage from a reference voltage generation circuitry, wherein the reference voltage is generated based on a reference current from an external reference current source;
• and
• generating a comparator output signal indicating whether a noise detection event is occurring based on comparing, by a comparator from the one or more comparators, the Vsense and the reference voltage.

A system-on-chip (SoC), comprising:

• a plurality of voltage noise monitors (VNMs) for monitoring supply noise from a power source, wherein each of the plurality of VNMs comprises:
• analog circuitry comprising:
• sense voltage (Vsense) circuitry comprising:
• one or more Vsense circuits, wherein each of the one or more Vsense circuits comprises:
• a controlled resistor that is tunable based on threshold information from a micro-processor, wherein each of the one or more Vsense circuits outputs Vsense based on a resistance of the controlled resistor and a supply voltage from the power source;
• reference voltage generation circuitry configured to generate a reference voltage based on a reference current from an external reference current source;
• and
• one or more comparators, wherein each of the one or more comparators is configured to:
• receive the Vsense from a Vsense circuit of the one or more Vsense circuits;
• receive the reference voltage from the reference voltage generation circuitry;
• and
• generate a comparator output signal indicating whether a noise detection event is occurring based on a comparison between the Vsense and the reference voltage.