This article presents a continuous-time zoom analog to digital converter (ADC) for audio applications. It employs a high-speed asynchronous SAR ADC that dynamically updates the references of a continuous-time delta–sigma modulator (CTDSM). Compared to previous switched-capacitor (SC) zoom ADCs, its input impedance is essentially resistive, which relaxes the power dissipation of its reference and input buffers. Fabricated in a 160-nm CMOS process, the ADC occupies 0.27 mm² and achieves 108.1-dB peak SNR, 106.4-dB peak signal to noise and distortion ratio (SNDR), and 108.5-dB dynamic range in a 20-kHz bandwidth while consuming 618 $\mu \text{W}$ . This results in a Schreier figure of merit (FoM) of 183.6 dB.

中文翻译：

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用于低功耗音频应用的连续时间缩放 ADC

本文介绍了一种用于音频应用的连续时间缩放模数转换器 (ADC)。它采用高速异步 SAR ADC，可动态更新连续时间 Δ-Σ 调制器 (CTDSM) 的参考。与之前的开关电容 (SC) 缩放 ADC 相比，其输入阻抗本质上是电阻性的，这降低了其参考和输入缓冲器的功耗。ADC 采用 160-nm CMOS 工艺制造，占用 0.27 mm ²并在 20-kHz 带宽内实现 108.1-dB 峰值 SNR、106.4-dB 峰值信噪比和失真比 (SNDR) 和 108.5-dB 动态范围，同时消耗 618 $\mu \text{W}$ . 这导致 Schreier 品质因数 (FoM) 为 183.6 dB。