Power Sense Correction for Power Budget Estimator

A method comprising:

• estimating, by a power management circuit, power consumption of an execute circuit using a particular operation of a plurality of operations to be executed by the execute circuit;
• withdrawing, by the power management circuit based on the estimated power consumption, a first amount of power credits from a power credit pool;
• during execution of the particular operation, generating, by the power management circuit, a power value by monitoring one or more characteristics of a power supply node coupled to the execute circuit;
• and
• based on a comparison of the estimated power consumption and the power value, refunding, by the power management circuit, a second amount of power credits to the power credit pool.

An apparatus comprising:

• a series of invertor circuits configured to delay propagation of a signal transition at an input of an initial invertor circuit of the series, wherein an amount of delay time through a particular invertor circuit of the series is based on a voltage level of a power supply node of an execute circuit;
• a logic circuit configured to detect a logic level at an output of a plurality of the series of invertor circuits;
• and
• a control circuit configured to:
• determine respective power values at a plurality of points in time using the detected logic levels;
• and
• using the respective power values, determine, for the execute circuit, a difference between estimated power consumption and actual power consumption.