A Bandgap Reference with High Temperature Performance

A bandgap voltage reference with low temperature-drift was proposed based on OKI 0. 5 μm Bi CMOS process. The voltage-mode output stage of traditional reference was improved and a mixed-mode output stage which comprised both voltage and current modes was introduced. Thus the flexibility of temperature compensation was improved. Meanwhile a high-precision curvature correction circuit based on piecewise linear compensation technology was designed to trim the high-order temperature components of the reference voltage. Simulation using HSPICE software showed that,the output reference voltage was 1. 2156 V under the 5 V power supply and its temperature coefficient was 0. 43 ×10-6/ ℃ at the range of-40 ℃ ~ 125 ℃. The power supply rejection ratio( PSRR) was lower than-83 d B at low frequency. Line regulation in the supply range of 3. 8 V ~ 10 V was 9. 2 μV / V.