Asynchronous Level Crossing ADC Design for Wearable Devices: A Review

摘要

Asynchronous level crossing ADCs (LC ADC) saves power through non-uniform sampling making it suitable for wearable devices. This paper presents a review of asynchronous level crossing ADCs based on an exhaustive survey of papers from 1966 to 2016. The various architectures of level crossing ADCs are studied and classified into two types, LC ADC with feedback DAC and LC ADC with Flash ADC like architecture. The performance trends such as figure of merit, resolution, power consumption, die area, supply voltage scaling, and technological scaling are compared with other asynchronous ADCs and synchronous ADCs to evaluate the suitability of LC ADCs in wearable devices. The algorithm for general framework of LC ADC using MATLAB is presented in this paper. The signal from the general LC ADC is reconstructed using polynomial interpolation achieving a SNDR of 32.27dB.