SUPPLY VOLTAGE REGULATION WITH TEMPERATURE SCALING

摘要

A supply voltage regulation system for an IC including a temperature sensor that detects temperature of the IC, a scaling resistor coupled between a power grid and a feedback node of the IC, a regulator amplifier that compares a voltage of the feedback node with a reference voltage for developing a supply voltage for the IC, and a temperature scaling circuit that drives a scaling current to the scaling resistor via the feedback node to adjust the supply voltage based on temperature. The temperature scaling circuit may include one or more comparators that compare a temperature signal with corresponding temperature thresholds for selectively applying one or more bias currents to the scaling resistor. The scaling resistor may be coupled to a hot point of the power grid. A voltage difference between a hot point of a ground grid may be converted to a bias current applied to the scaling resistor.

主权项

1. A supply voltage regulation system, comprising:
an integrated circuit having a ground pad coupled to a ground grid incorporated on said integrated circuit and a having a power pad coupled to a power grid incorporated on said integrated circuit; a temperature sensor provided on said integrated circuit that provides a temperature sense signal indicative of a die temperature of said integrated circuit; a scaling resistor having a first end coupled to said power grid and having a second end coupled to a feedback node; a voltage regulator amplifier having a first input receiving a reference voltage, having a second input coupled to said feedback node, and having an output for driving a supply voltage to said power pad of said integrated circuit; and a temperature scaling circuit having an input receiving said temperature sense signal and having an output coupled to said feedback node, wherein said temperature scaling circuit drives a scaling current to said scaling resistor via said feedback node to adjust said supply voltage based on said temperature sense signal.