An 11.4mW 80.4dB-SNDR 15MHz-BW CT Delta-Sigma Modulator Using 6b Double-Noise-Shaped Quantizer

📋 论文概要

该论文提出了一种采用6位双噪声整形量化器的连续时间ΔΣ调制器，通过结合VCO基量化器和噪声整形积分量化器的优点，在11.4mW功耗下实现了80.4dB SNDR和15MHz带宽，解决了传统量化器在速度和线性度之间的折中问题。

💡 主要创新点

• 提出一种6位双噪声整形量化器，同时利用VCO基量化器的高速特性和NSIQ的高线性度。
• 在连续时间ΔΣ调制器中实现双噪声整形，有效提高量化噪声抑制阶数。

🏷 关键词

📄 原文摘要

Quantizers are key building blocks in both continuous-time (CT) and discrete-time (DT) delta-sigma modulators (DSMs). Among various types of quantizers, noiseshaping quantizers such as VCO-based quantizers and noise-shaped integrating quantizers (NSIQ) [1] are attractive solutions since they provide an additional order of quantization noise shaping. On one hand, VCO-based quantizers are relatively fast, but are often non-linear. On the other hand, NSIQs suffer from a tradeoff between the counting clock speed and resolution, but can be very linear. Nevertheless, the NSIQ offers an interesting benefit that the quantization error is inherently available in both time and voltage domains. Thus, the NSIQ can be easily extended to provide an additional order of noise shaping. In this paper, we propose a double noise-shaping quantizer (DNSQ) incorporating an NSIQ and a gated-ring-oscillator-based (GRO-based) quantizer [2] that not only provides 6b

👥 作者与机构

Taewook Kim, Changsok Han, Nima Maghari

University of Florida, Gainesville, FL