A 1.0-8.3 GHz Cochlea-Based Real-Time Spectrum Analyzer With Δ-Σ-Modulated Digital Outputs
A 1.0-8.3 GHz Cochlea-Based Real-Time Spectrum Analyzer With Δ-Σ-Modulated Digital Outputs
复制标题
DOI：
10.1109/tcsi.2020.2990364
复制
发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Yingying Wang;G. Mendis;Jin Wei-Kocsis;A. Madanayake;S. Mandal
中科院分区：
文献类型：
--
作者：
Yingying Wang;G. Mendis;Jin Wei-Kocsis;A. Madanayake;S. Mandal
生物内耳，即耳蜗，是一个复杂精妙的信号处理系统，它能在约20赫兹至20千赫兹的超宽带频率范围内进行频谱分析，灵敏度极高且能量利用效率高。电子耳蜗模型利用双向传输线或滤波器级联来模拟生物内耳的指数渐变结构，在音频和射频频段都可作为快速且硬件效率高的频谱分析仪。本文介绍了一款基于耳蜗设计、采用65纳米互补金属氧化物半导体（CMOS）工艺的数字可编程单芯片射频（RF）频谱分析仪。这款“射频耳蜗”芯片包含一个传输线有源耳蜗模型，该模型有50个呈指数间隔分布的并行级，可对1.0 - 8.3吉赫兹的射频频谱进行分析。所有级的输出以并行方式编码为Δ - Σ（delta - sigma）调制数字信号，以便由数字后端处理器进行实时解调与分析。该芯片功耗为418毫瓦，通常在5 - 6位有效位数（ENOB）下可产生约1吉采样/秒（GS/s）的总数据量。此外，还实现并测试了一款基于该射频耳蜗、由人工智能（AI）驱动的单通道认知无线电（CR）接收器。
The biological inner ear, or cochlea, is a sophisticated signal processing system that performs spectrum analysis over an ultra-broadband frequency range of ~20 Hz to 20 kHz with exquisite sensitivity and high energy efficiency. Electronic cochlear models, which mimic the exponentially-tapered structure of the biological inner ear using bidirectional transmission lines or filter cascades, act as fast and hardware-efficient spectrum analyzers at both audio and radio frequencies. This paper describes a cochlea-based digitally-programmable single-chip radio frequency (RF) spectrum analyzer in 65 nm CMOS. This “RF cochlea” chip includes a transmission-line active cochlear model with 50 parallel exponentially-spaced stages that analyzes the radio spectrum from 1.0-8.3 GHz. The outputs of all stages are encoded in parallel as delta-sigma ( $\Delta - \Sigma $ ) modulated digital signals for real-time demodulation and analysis by a digital back-end processor. The chip consumes 418 mW and typically generates ~1 GS/s of total data at an ENOB of 5–6 bits. An artificial intelligence (AI)-driven single-channel cognitive radio (CR) receiver based on the RF cochlea has also been implemented and tested.