JSSC 2006第9期Power Management1.5 μm BiCMOS

Low-Power Single-Loop and Dual-Loop AGCs for Bionic Ears

本文介绍了两款低功耗自动增益控制电路，适用于仿生耳，具有宽动态范围和可编程时间常数。

78 dB输入动态范围，2.8 V供电，小于36 μW功耗

仿生耳自动增益控制低功耗宽动态范围可编程时间常数

▸使用可编程连续电流模式反馈网络控制可变增益放大器

▸双环控制器实现简化的噪声环境语音处理算法

▸连续-离散混合控制器结合滤波保持峰值检测器和电荷泵保持计时器

Abstract

Bionic ears or cochlear implants for the deaf require low-power wide-dynamic-range automatic-gain-control circuits (AGCs) to interface between microphone preampliﬁers and analog processing circuits or A/D converters. Hearing-impaired patients need strategies which switch intelligently between time constants for speech and time constants for interfering transients. We describe two AGC designs which use a programmable con- tinuous current-mode feedback network to control a variable gain ampliﬁer.