模拟-时间-数字型ADC结构设计综述

Overview on the analog-time-digital based ADC architecture design

针对模/数转换器对输入模拟量难以完成数字量化的问题,对模拟/时间转换和时间/数字转换相结合的模/数转换器进行讨论。分析压控振荡器型、脉冲宽度调制型以及时间延迟型3种结构的工作原理、各自优缺点及应用方向,总结模拟-时间-数字型模/数转换器的发展现状,并对其在低压低功耗片上系统的应用前景进行展望。

In response to the difficulties of converting the analog signal directly to digital codes,analog-time-digital based ADCs（Analog-to-Digital,ADC）that combine the analog-to-time conversion with the time-to-digital conversion are discussed in this paper.The operation mechanisms,merits and drawbacks,and application of voltage controlled oscillator based ADC,pulse width modulation based ADC and time delay based ADC are discussed individually.The state-of-the-art of analogtime-digital based ADC is highlighted.The application future of these three analog-time-digital based ADCs in low-power SoC is also indicated.