← 返回 JSSC 论文列表JSSC 2021第4期Data Converters0.16μmSAR ADC
A 440-μW, 109.8-dB DR, 106.5-dB SNDR Discrete-Time Zoom ADC With a 20-kHz BW Efraïm Eland
一款用于音频应用的高动态范围离散时间Zoom ADC，结合SAR ADC和Delta-Sigma调制器技术。
109.8-dB DR, 106.5-dB SNDR, 107.5-dB SNR, 20-kHz带宽, 440μW功耗
Zoom ADCSAR ADCDelta-Sigma调制器音频应用高动态范围
▸采用5-bit SAR ADC与三阶Delta-Sigma调制器结合
▸使用2-bit量化器和环路滤波器凹槽降低过采样率
▸额外前馈路径减少SAR ADC量化噪声泄漏
Abstract
This article describes a discrete-time zoom analog- to-digital converter (ADC) intended for audio applications. It uses a coarse 5-bit SAR ADC in tandem with a fine third-order delta–sigma modulator ( M) to efficiently obtain a high dynamic range. To minimize its over-sampling ratio (OSR) and, thus, its digital power consumption, the modulator employs a 2-bit quantizer and a loop filter notch. In addition, an extra feed-forward path minimizes the leakage of the SAR ADC’s quantization noise into the audio band. The prototype ADC occupies 0.27 mm 2 in a 0.16-μm technology. It achieves 109.8-dB DR, 106.5-dB SNDR, and 107.5-dB SNR in a 20-kHz bandwidth while dissipating 440 μW. It also achieves state-of-the-art energy efficiency, as demonstrated by a Schreier FoM of 186.4 dB and an SNDR FoM of 183.6 dB.