Higher-Order Curvature-Compensated Bandgap Voltage Reference with High PSRR
Xiangzhan Wang · 2011
Based on the principle of piecewise compensation,a novel higher-order curvature compensation method for bandgap reference was presented.This method focused on forming multiple local extrema of reference voltage curve in the entire operating temperature range,which significantly improves the temperature independence.Results from simulation based on 0.5 μm CMOS process showed that the circuit had a temperature coefficient of 5.8×10-7 / ℃ in the temperature range from-40 ℃ to 135 ℃.By using an error amplifier with improved PSRR,the reference source,which operated at 5 V supply power,had a PSRR of-95.4 dB and-92.4 dB at dc and 1 kHz,respectively.