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A Continuous-Time Zoom ADC for Low-Power
一种用于低功耗音频应用的连续时间缩放ADC
108.1-dB peak SNR, 106.4-dB peak SNDR, 108.5-dB dynamic range, 618 µW power consumption
连续时间缩放ADC低功耗音频应用异步SAR ADCdelta-sigma调制器
▸采用高速异步SAR ADC动态更新CTDSM的参考电压
▸输入阻抗本质上为电阻性，降低了参考和输入缓冲器的功耗
▸结合连续时间delta-sigma调制器和SAR ADC的优势
Abstract
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. Fabri- cated in a 160-nm CMOS process, the ADC occupies 0.27 mm 2 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 µW. This results in a Schreier figure of merit (FoM) of 183.6 dB.