On-die power sensor for performing run-time power / voltage / current management

Abstract

An on-die power sensor includes a digital current sensor, a digital voltage sensor and a power calculator for performing run-time power / voltage / current management. The digital current sensor measures speed counts of two identical ring oscillators, acquire an overall delta speed count between the two ring oscillators, converts the overall delta speed count to a voltage drop based on a trimmed slope of a first lookup table, and convert the voltage drop to a run-time current based on a trimmed DCR of a second lookup table. The digital voltage sensor records values of the speed counts measured by the digital current sensor to quantify a run-time voltage based on a third lookup table. The power calculator obtains a run-time power by multiplying the run-time current and the run-time voltage.

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