Error Sources of CMOS Bandgap Reference and Their Improvement
Qin Shicai · 2005
This paper analyses all the error sources in bandgap voltage reference and presents precise mathematical expression and the corresponding improvment method. According to the analysis, a new bandgap voltage reference based on 0.25 μm CMOS technology is designed and fabricated. The design value is 1.2 V. Testing shows that the standard deviation of the reference voltage is 3 mV, the temperature coefficient is 20 ppm/ °C over -40~100 °C and the supply rejection ratio is 80 μV/V for 2 V to 3.3 V supply. These results prove the theory.