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首页> 外文期刊>Measurement >Time-to-digital converters based on event-driven successive charge redistribution: A theoretical approach
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Time-to-digital converters based on event-driven successive charge redistribution: A theoretical approach

机译：基于事件驱动的连续电荷再分配的时间数字转换器：一种理论方法

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摘要

Due to reduction of supply voltage and improving the time resolution with continued down scaling of CMOS technology, encoding signal values in the time domain has become a technique of increasing importance in modern signal processing. Time encoding is proposed to be an underlying principle and a general postulate of Time-Mode Signal Processing (TMSP). In particular, time encoding is used in the asynchronous analog-to-digital conversion (A-ADC) to encode the asynchronous sequence of time intervals that represent signal amplitude values. In the paper, a new method of time-to-digital conversion (TDC) is proposed where the discretized time interval is first converted to the corresponding charge packet, and next processed in the charge domain by event-driven successive charge redistribution. The proposed circuit configuration is extremely simple and contains only a binary-weighted capacitor array, one or two current sources, a group of controlled switches, two comparators and an asynchronous state machine. The TDC architecture is scalable, self-timed and does contain neither a clock nor a digital-to-analog converter. The development of the successive redistribution TDC makes possible removing the clock not only from time encoding block but also from the time-to-digital converter in A-ADCs.
机译：由于降低了电源电压并随着CMOS技术的不断缩小而提高了时间分辨率，因此在时域中对信号值进行编码已成为现代信号处理中越来越重要的技术。提出时间编码是时间模式信号处理（TMSP）的基本原理和一般假设。特别地，在异步模数转换（A-ADC）中使用时间编码来编码表示信号幅度值的时间间隔的异步序列。在本文中，提出了一种新的时间数字转换方法（TDC），其中离散时间间隔首先转换为相应的电荷包，然后通过事件驱动的连续电荷重新分配在电荷域中进行处理。提出的电路配置非常简单，仅包含一个二进制加权电容器阵列，一个或两个电流源，一组受控开关，两个比较器和一个异步状态机。 TDC体系结构是可扩展的，自定时的，并且既不包含时钟也不包含数模转换器。逐次重新分配TDC的发展不仅可以从时间编码模块中删除时钟，而且还可以从A-ADC中的时间数字转换器中删除时钟。

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