Self-calibrating digital bandgap voltage and current reference

摘要

A reference voltage generator is provided. In an example, the reference voltage generator includes a temperature-dependent device, a processing module configured to process a digital representations of first and second voltages derived from the temperature-dependent device and a reference voltage to determine a value, and a digital to analog converter (DAC) configured to generate a reference voltage based on the value. The first voltage is proportional to absolute temperature (PTAT) and the second voltage is complementary to absolute temperature (CTAT) and the reference voltage is substantially independent of absolute temperature in an operating temperature range of the reference voltage generator.

主权项

1. A reference voltage generator, comprising:
a temperature-dependent device; a processing device comprising circuitry configured to process a reference voltage and digital representations of first and second voltages, the first and second voltages being derived from the temperature dependent device, and to output a value; a digital to analog converter (DAC) comprising circuitry configured to generate the reference voltage based on the value; wherein the first voltage is proportional to absolute temperature (PTAT) and the second voltage is complementary to absolute temperature (CTAT), and wherein the reference voltage is substantially independent of absolute temperature in an operating temperature range of the reference voltage generator; and wherein the reference voltage is fed back from the DAC to the processing device.