A new type of curvature-compensated CMOS bandgap voltage references

Precise CMOS bandgap voltage references which uses the difference of MOS source-gate voltages to perform efficient curvature compensation have been designed and fabricated. The reference circuits use less than 18 transistors. However, they can achieve precise reference voltages. Experimental chip shows an average drift of 5.5 ppm/°C from -60°C to 150°C and 25 μV/V for supply voltages from 5 V to 15 V at 25°C. Due to novel curvature compensation, the circuit structure of the proposed references is simple and both chip area and power consumption are small