A 28mW Spectrum-Sensing Reconfigurable 20MHz 72dB-SNR 70dB-SNDR DT ΔΣ ADC for 802.11n/WiMAX Receivers

📋 论文概要

本论文提出一种用于802.11n/WiMAX接收机的28mW频谱感知可重构离散时间ΔΣ ADC，通过可重构调制器阶数在恒定采样率下优化信噪比，替代了复杂的模拟基带电路，实现了20MHz带宽下72dB SNR和70dB SNDR。

💡 主要创新点

• 提出用可重构调制器阶数（4种模式）替代复杂模拟基带电路，根据信号和带外阻塞功率动态优化SNR。
• 集成5位flash ADC作为转换器前端，实现频谱感知功能。
• 在恒定采样频率下改变调制器阶数，保持抗混叠滤波器不变，简化系统设计。

🏷 关键词

📄 原文摘要

11n/WiMAX receivers (20 to 2.5MHz per I/Q) is presented. The intent is to replace complex analog baseband circuits with a combination of tunable one-pole filter, anti-alias filter and coarse VGA (Fig. 27.5.1) [1]. Blocker filtering, fine variable-gain amplification and variable-BW channel selection are moved to the digital baseband. The SNR is optimized as a function of signal and out-of-band blocker power [2] by reconfiguring the modulator order into one of 4 modes at constant fs, thereby keeping anti-aliasing unchanged. A 5b flash ADC integrated in the converter is the front end of a simple spectrum analyzer (SSA). Spectrum sensing and reconfigurability are accomplished without compromising ADC performance. A low FOM is obtained through three means. Firstly, feed-forward

👥 作者与机构

Pukar Malla1,2, Hasnain Lakdawala1, Kevin Kornegay3, K. Soumyanath1, 1

Intel, Hillsboro, OR, 2Cornell University, Ithaca, NY Georgia Institute of Technology, Atlanta, GA 3 A reconfigurable power-adaptive DT ΔΣ ADC for intelligent 802