Abstract: In this paper, a high precision and high order temperature compensation bandgap reference with wide temperature range is designed and implemented. This structure achieves first-order temperature compensation by well balancing the base-emitter voltage $ V_{BE} $ of a forward-biased triode, which exhibits a complementary to absolute temperature (CTAT) characteristic, and the $ \Delta V_{BE} $ with a proportional to absolute temperature (PTAT) characteristic. In addition, the piecewise temperature compensation circuit is used to realize the curvature compensation of the low and high temperature sections, so as to achieve a low temperature drift in a wide temperature range. In order to further improve the output accuracy, the core operation amplifier adopts the folding common-source common-gate structure to obtain higher gain, and the chopper technology is added to reduce the influence of device mismatch and noise. Finally, in order to meet the process consistency, a trimming circuit is designed. The bandgap reference circuit is designed based on the TSMC 0.18 $ \mu $m BCD process. Post-layout simulation results show that with a supply voltage of 3.3-5.0 V and a temperature range of -40-125 $ ^{\circ} $C, the temperature coefficient of the designed bandgap reference at each process corner is lower than $ 10^{-5} $ $ ^{\circ} $C $ ^{-1} $, and the output voltage is 2.5 V. The static power consumption is 45 $ \mu $A, and the voltage accuracy error is less than 0.2%.
Keywords: chopper modulation; piecewise curvature compensation circuit; high precision; trimming resistor; bandgap reference
合肥工业大学学报自科版