Journal of Guangxi Normal University(Natural Science Edition) ›› 2017, Vol. 35 ›› Issue (2): 17-23.doi: 10.16088/j.issn.1001-6600.2017.02.003

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The Design of a Piecewise Compensated Bandgap Voltage Reference

WANG Jun, WEI Duqu*   

  1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004, China
  • Online:2017-07-25 Published:2018-07-25

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Abstract: For first-order temperature compensation of the reference voltage source is still high temperature coefficient, this paper proposes a design method of piecewise compensation to reduce the temperature drift. A voltage signal following the temperature variation is produced by an amplifier with negative resistance of which gain is sensitive to temperature. Drived by this voltage signal, a PMOS transistor is used to inject or extract electricity current for the reference circuit in three temperature segments as a pattern of piecewise compensation. The simulation results indicate that the reference voltage of circuit only change 0.311 mV and its temperature coefficient is 1.89×10-6 ℃-1 in the temperature range(TR) from -40 ℃ to 125 ℃. Its PSRR is -90 dB at low frequency. When the temperature of the bandgap reference voltage source is at -15 ℃, 34 ℃ and 76 ℃, the curvature of the reference voltage to the temperature is 0, and the temperature drift coefficient is lower in the standard process. The study can provide a high precision voltage reference for ADC, linear voltage regulator and DC/DC converter circuit.

Key words: temperature coefficient, bandgap reference, PSRR, piecewise compensation

CLC Number: 

  • TN432
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[1] LIAN Tianpei,JIANG Pinqun,SONG Shuxiang,CAI Chaobo,PANG Zhongqiu. Design of a Bandgap Reference with Low Temperature Coefficient High PSRR and Wide Band [J]. Journal of Guangxi Normal University(Natural Science Edition), 2019, 37(1): 125-132.
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