Apparatus and method for measuring load current by applying compensation gain to a voltage derived from a drain-source voltage of a power gating device

摘要

An apparatus and method for measuring load current supplied to one or more integrated circuit cores is disclosed. The device includes a power gating FET (field effect transistor) including a gate, a source and a drain, the source coupled to the voltage rail, the drain coupled to the load, and the gate allowing the load current to flow between the voltage rail and the load Configured to receive a gating voltage for selectively turning on the power gating FET; And a differential amplifier configured to generate a current-related voltage related to the load current by applying a gain to the input voltage based on a drain-source voltage of the power gating FET, wherein the gain is determined by the temperature of the power gating FET or the gate- In response to the variation of the input voltage.;