A self-calibrated bandgap voltage reference with 0.5 ppm//spl deg/C temperature coefficient

This work introduces a multi-segment bandgap reference circuit with self-calibration. Thermal characteristics of the bandgap circuit were modeled using test results under normal temperatures. With the characterization information, appropriate circuit parameters were calculated for different temperature intervals and used to adjust the inflection point of the bandgap curve as the temperature changes, in order for the reference circuit to achieve high thermal stability. Simulation results show that the proposed circuit can achieve a better than 0.5 ppm/degC temperature coefficient over a range of 140degC. This circuit is compatible with most of the existing bandgap circuit structures and can be used in low-voltage designs