arXiv 2301.020122023-01-05eess.SP

时间编码亚奈奎斯特ADC的硬件原型

Hardware Prototype of a Time-Encoding Sub-Nyquist ADC

Hila Naaman, Nimrod Glazer, Moshe Namer, Daniel Bilik, Shlomi Savariego, Yonina C. Eldar

摘要：

模数转换器（ADC）是数字信号处理的关键部件。在这个框架中的经典采样器由一个全局时钟控制。在高采样速率下，时钟昂贵且耗电，从而增加ADC的成本和能耗。因此，希望使用无时钟ADC以尽可能低的速率进行采样。集成触发时间编码机（IF-TEM）是一种基于时间的高能效异步设计，不与全局时钟同步。在各种应用中普遍存在的新息速率（FRI）信号具有比信号的奈奎斯特速率更少的自由度，从而实现了次奈奎斯特采样信号模型。本文提出了一种高能效的IF-TEM ADC架构，并演示了亚奈奎斯特采样和FRI信号恢复。使用IF-TEM，我们在硬件中实现了第一个子奈奎斯特时基采样器。我们提供了一个可行的方法，准确地估计FRI参数IF-TEM数据。建议的硬件和重构方法检索FRI参数时误差高达-25dB，同时以低于奈奎斯特速率约10倍的速率工作，为低功耗ADC架构铺平了道路。

英文摘要：

Analog-to-digital converters (ADCs) are key components of digital signal processing. Classical samplers in this framework are controlled by a global clock. At high sampling rates, clocks are expensive and power-hungry, thus increasing the cost and energy consumption of ADCs. It is, therefore, desirable to sample using a clock-less ADC at the lowest possible rate. An integrate-and-fire time-encoding machine (IF-TEM) is a time-based power-efficient asynchronous design that is not synced to a global clock. Finite-rate-of-innovation (FRI) signals, ubiquitous in various applications, have fewer degrees of freedom than the signal's Nyquist rate, enabling sub-Nyquist sampling signal models. This work proposes a power-efficient IF-TEM ADC architecture and demonstrates sub-Nyquist sampling and FRI signal recovery. Using an IF-TEM, we implement in hardware the first sub-Nyquist time-based sampler. We offer a feasible approach for accurately estimating the FRI parameters from IF-TEM data. The suggested hardware and reconstruction approach retrieves FRI parameters with an error of up to -25dB while operating at rates approximately 10 times lower than the Nyquist rate, paving the way to low-power ADC architectures.

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英文摘要：

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