High precision, curvature compensated bandgap reference circuit with programmable gain

摘要

A high precision, curvature compensated bandgap reference circuit with programmable gain is provided. An exemplary bangap reference circuit comprises a curvature compensation circuit configured for compensation of the temperature coefficient characteristic of the bandgap reference circuit, and a programmable gain circuit configured for adjusting the gain the output of the curvature compensation circuit to provide a high precision reference voltage. To facilitate high precision and accuracy, each of the curvature compensation circuit and the programmable gain circuit are configured for trimming during operation/after manufacture. Trimming of the temperature compensation circuit is facilitated by a first digital-to-analog (DAC) device. The programmable gain circuit comprises a gain trimming circuit comprising a second DAC. The first DAC and second DAC can be suitably controlled in various manners, including use of microcontroller circuit having flash memory configured for storing and loading trim values into the first DAC and second DAC.