An apparatus is disclosed, including a monitoring circuit, a translation circuit, a first filter circuit, a second filter circuit, and an interface. The monitoring circuit may be configured to receive a plurality of code values indicative of a voltage level of a power supply signal. The translation circuit may be configured to translate a particular code value to a corresponding voltage value of a plurality of voltage values. The first filter circuit may be configured to filter one or more of the plurality of voltage values to generate a plurality of filtered voltage values. The second filter circuit may be configured to generate a plurality of current values using one or more of the plurality of filtered voltage values and based on an impulse response of the power supply signal. The interface may be configured to send one or more of the plurality of current values to a functional circuit.