Power calibration and monitoring system

An integrated circuit (IC), comprising:

• a functional circuit configured to generate a differential pair of node voltages;
• and
• a power calibration and monitoring system comprising:
• a digital-to-analog converter (DAC) configured to generate a differential pair of feedback currents based on a digital count;
• a variable gain amplifier (VGA) that is coupled to the DAC in a negative feedback configuration, and configured to generate a differential pair of amplified signals based on a magnitude difference between (i) the differential pair of feedback currents and (ii) a differential pair of detection currents that is derived from the differential pair of node voltages;
• and
• a counter configured to generate the digital count based on the differential pair of amplified signals, wherein the differential pair of feedback currents is controlled based on the digital count such that the magnitude difference between the differential pair of detection currents and the differential pair of feedback currents is within a first tolerance limit, and wherein based on the digital count, a power associated with the functional circuit is at least one of calibrated and monitored.