A novel piecewise curvature-corrected technology was proposed in this paper to solve the problem that a bandgap voltage reference with high temperature coefficient and low PSRR. In the reference circuit, the whole operating temperature range was divided into three sub-ranges, so that the reference can be compensated by different temperature functions. At the same time, a negative feedback loop was used to improve PSRR at low frequency. Based on the two points mentioned above, the temperature coefficient of 1.24×10-6 over the temperature of -40 ℃ to 150 ℃ and PSRR of -137 dB at DC was achieved. The reference is implemented by TSMC 0.6 μm BCD process, the chip area is 0.5 mm2, the shutdown current is lower than 0.1 μA, and the quiescent dissipation is 125 μW. The designed circuit is validated by the results of the chip test, and the reference voltage skew is less than 0.220 mV under the supply voltage ranging from 2.5 V to 6 V．
DAI Guo-ding, XU Yang, LI Wei-min, HUANG Peng. Design of high performance bandgap reference based on piecewise
temperature curvature compensated technology. J4, 2010, 44(11): 2142-2147.
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