Temperature correction of an on-chip voltage reference

摘要

In an example, a temperature-corrected voltage reference circuit for use in an integrated circuit (IC) includes a voltage reference circuit, a programmable gain amplifier, and a digital control circuit. The programmable gain amplifier includes a first input coupled to the voltage reference circuit, a second input coupled to receive a control signal, and an output coupled to provide a temperature-corrected voltage reference. The digital control circuit includes an input coupled to receive a temperature signal indicative of temperature of the IC and an output coupled to the second input of the programmable gain amplifier, the digital control circuit generating the control signal in response to the temperature signal.

主权项

1. A temperature-corrected voltage reference circuit for use in an integrated circuit (IC), comprising:
a voltage reference circuit; a programmable gain amplifier having a first input coupled to the voltage reference circuit, a second input coupled to receive a control signal, and an output coupled to provide a temperature-corrected voltage reference; and a digital control circuit having an input coupled to receive a temperature signal indicative of temperature of the IC and an output coupled to the second input of the programmable gain amplifier, the digital control circuit including a memory storing trim data that includes a control code associated with a first gain corresponding to a reference temperature and a temperature profile that includes a plurality of codes for selecting gain values corresponding to temperatures above and below the reference temperature, the digital control circuit generating the control signal in response to the temperature signal and based on the trim data and the temperature profile.