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首页> 外文期刊>Circuits and Systems I: Regular Papers, IEEE Transactions on >A/D Conversion Using Asynchronous Delta-Sigma Modulation and Time-to-Digital Conversion
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A/D Conversion Using Asynchronous Delta-Sigma Modulation and Time-to-Digital Conversion

机译：使用异步Delta-Sigma调制和时间数字转换的A / D转换

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摘要

An analog-to-digital conversion (ADC) scheme based on asynchronous $DeltaSigma$ modulation and time-to-digital conversion is presented. An asynchronous $DeltaSigma$ modulator translates the analog input to an asynchronous duty-cycle modulated signal. Next, the edge locations are digitally measured using a time-to-digital converter (TDC). This information is then digitally processed into a conventional digital signal. The performance of this novel ADC scheme is theoretically analyzed and verified with simulations. With the proposed digital demodulation algorithm, 11-bit resolution can be obtained with an overcycling ratio (OCR) of only four, which is suitable for high bandwidth applications such as very high bit-rate digital subscriber line (VDSL). When a higher OCR can be tolerated, a gated ring-oscillator (GRO) TDC with an inherent first-order noise shaping property is suggested in combination with a digital continuous-time moving-average (CTMA) filter. This allows for resolutions in excess of 13 bits, which is suitable for ADSL2+. The proposed technique shifts the complexity toward the digital domain, leading to more compact ADC and reduced power consumption, and is, therefore, particularly suited for ADC in ultralow-voltage nanometer technologies that are used for high-speed data communication applications.
机译：提出了一种基于异步DeltaSigma调制和时间数字转换的模数转换（ADC）方案。异步$ DeltaSigma $调制器将模拟输入转换为异步占空比调制信号。接下来，使用时间数字转换器（TDC）对边缘位置进行数字测量。然后将该信息数字化处理为常规数字信号。从理论上分析和验证了这种新颖ADC方案的性能。使用提出的数字解调算法，可以以仅4的超循环比（OCR）获得11位分辨率，这适用于高带宽应用，例如非常高的比特率数字用户线（VDSL）。当可以容忍较高的OCR时，建议将具有固有的一阶噪声整形特性的门控环形振荡器（GRO）TDC与数字连续时间移动平均（CTMA）滤波器结合使用。这允许超过13位的分辨率，适用于ADSL2 +。所提出的技术将复杂性转移到了数字领域，从而导致了ADC的更紧凑和功耗的降低，因此特别适合用于高速数据通信应用的超低压纳米技术中的ADC。

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