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本文提出一种无时钟的自定时增量ΔΣ ADC，采用过零点检测技术，无需专用时钟信号，从而降低功耗和系统复杂度。该ADC适用于能量受限的传感器应用，可自动断电以适应不同转换速率。
This paper introduces a clock-free self-timed incremental ΔΣ ADC. Unlike conventional ΔΣ ADCs, it does not require a dedicated clock signal, thus saving energy and reducing system complexity. As such, it has similar advantages as self-timed (or asynchronous) SAR ADCs [1]. It is particularly suited for use in energy-constrained sensor applications, in which conversions of a quasistatic input signal are triggered by infrequent and possibly irregular external events. As it autonomously powers down upon completion of a conversion, it can adapt to a wide range of conversion rates in an energy-efficient way. In contrast with asynchronous ΔΣ modulators, which also operate without a clock [2], the ΔΣ ADC described in this paper employs a discrete-time switchedcapacitor loop filter and a clocked comparator, albeit self-timed, and therefore has the same noise-shaping characteristics as a conventional discrete-time
Chao Chen, Zhichao Tan, Michiel A. P. Pertijs
Delft University of Technology, Delft, The Netherlands