DAC waveform effects in CT incremental ΣΔ ADCs for biosensor applications
DAC waveform effects in CT incremental ΣΔ ADCs for biosensor applications
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用于生物传感器应用的 CT 增量 ΣΔ ADC 中的 DAC 波形效应
DOI：
10.1109/newcas.2013.6573569
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Rusu
中科院分区：
文献类型：
--
作者：
S. Tao;S. Rodriguez;A. Rusu
增量式Σ-Δ（I <$Δ）模数转换器（ADC）本质上是具有周期性复位功能的<$Δ ADC，非常适合低功耗低速生物传感器应用。近年来，人们一直在探索连续时间（CT）I <$Δ ADC在功耗方面的潜在优势。本文分析了反馈型数模转换器（DAC）对CT I Δ ADC性能的影响。首先分析了不同的反馈DAC方案，然后将其应用于三阶单位CT I/Δ ADC中进行评估。仿真结果表明，该方案在时序误差敏感性和功耗之间取得了较好的平衡，为选择低功耗反馈DAC方案提供了参考。
Incremental sigma-delta (IΣΔ) analog-to-digital converters (ADCs), which are essentially ΣΔ ADCs with periodic resetting, are well suited for low-power low-speed biosensor applications. In recent years, the potential advantage in terms of power dissipation of continuous-time (CT) IΣΔ ADCs have been explored. This paper analyzes the impact of feedback digital-to-analog converters (DACs) on the performance of CT IΣΔ ADCs. Different feedback DAC schemes are firstly analyzed and then evaluated by employing them in a 3rd order single-bit CT IΣΔ ADC. Simulation results are discussed considering the trade-off between the timing error sensitivity and the power consumption, thereby offering a reference for selecting a power efficient feedback DAC scheme.