A High-Precision Bandgap Reference Source for Negative LDOs
LI Hong-bao, HU Gang-yi, Yonggui Hu · 2006
A high-precision bandgap reference circuit topology has been developed.Using 2nd-order curvature compensation technique,temperature performance of the voltage reference has been improved by compensating the negative temperature dependence of the logarithmic term in V_(be)(T) with a positive term.A negative low drop-out linear regulator is designed with the bandgap reference,and implemented in high voltage BIPIC process.Test results show that the negative LDO has a temperature coefficient of 85 ppm/℃,a max line regulation of 0.02%/V and a max load regulation of 0.2%.