Electronic Science and Technology ›› 2019, Vol. 32 ›› Issue (2): 32-36.doi: 10.16180/j.cnki.issn1007-7820.2019.02.007

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High Precision Integral Charge Balanced Analog to Digital Converter

LIU Lian,WEI Rongshan   

  1. College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
  • Received:2018-01-30 Online:2019-02-15 Published:2019-01-02
  • Supported by:
    National Natural Science Foundation of China(6140403)


A high speed integral charge balanced ADC composed of switch capacitor integrator, comparator, counter and control logic unit was proposed in this paper, which was mainly applied in ambient light sensors. In general, traditional dual slope ADC could not reduce the impact of artificial light flicker noise. Meanwhile, the conversion speed of traditional dual slope ADC was also limited. The new converter adopting integral type charge balance ADC structure changed the range of analog digital converter by controlling the current of integrator access circuit under different conditions, so as to improve the simulation speed and accuracy of the overall circuit. Spectre simulation experiments showed that the simulation accuracy achieved 16 bit and the total deviation was less than 0.5%, which demonstrated the whole simulation speed got improved.

Key words: integral charge balanced ADC, duel slope ADC, high precision, high simulation speed, ambient light sensor, variable integral current range

CLC Number: 

  • TN432