高精度积分型电荷平衡式模数转换器

doi:10.16180/j.cnki.issn1007-7820.2019.02.007

Abstract

Abstract:

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

LIU Lian,WEI Rongshan. High Precision Integral Charge Balanced Analog to Digital Converter[J].Electronic Science and Technology, 2019, 32(2): 32-36.

Figures/Tables 12

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References 16

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量程	量程/lux	最大输入光电流I_o,max	基准电流 I_REF	占空比D
量程1	1 024	2.5 μA	2.5 μA	0.5
量程2	4 096	5 μA	5 μA	0.5
量程3	16 384	10 μA	10 μA	0.5
量程4	65 536	20 μA	20 μA	0.5

High Precision Integral Charge Balanced Analog to Digital Converter

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