2023/01/05 by Hila Naaman, Nimrod Glazer, Naaman, Hila +9 · 2 citations
Computer Science · Engineering · #Advanced Electrical Measurement Techniques #Analog and Mixed-Signal Circuit Design #Asynchronous communication #Bandwidth (computing) #Blind Source Separation Techniques #Clock rate #Computer hardware #Computer science #Converters #Detector #Electronic engineering #Engineering #FOS: Electrical engineering #Nyquist frequency #Nyquist rate #Nyquist–Shannon sampling theorem #Oversampling #Physics #Power (physics) #Real-time computing #SIGNAL (programming language) #Sampling (signal processing) #Signal Processing (eess.SP) #Telecommunications #eess.SP #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2301.02012
published in arXiv (Cornell University) (Cornell University)
arxiv created 2023/01/05 · openalex publication_date 2023/01/05 · arxiv updated 2023/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.