A Bio-Realistic Analog CMOS Cochlea Filter With High Tunability and Ultra-Steep Roll-Off.
A Bio-Realistic Analog CMOS Cochlea Filter With High Tunability and Ultra-Steep Roll-Off.
复制标题
具有高可调性和超陡滚降的生物逼真模拟 CMOS 耳蜗滤波器。
DOI：
10.1109/tbcas.2014.2328321
复制
发表时间：
2015
影响因子：
5.1
通讯作者：
Wang S
中科院分区：
文献类型：
--
作者：
Wang S
本文介绍了一种模拟超大规模集成电路（VLSI）的耳蜗滤波器的设计和实验结果，它非常类似于哺乳动物耳蜗的生理测量响应。该滤波器由三个专门的子滤波器级组成，分别提供低频无源响应、中频有源可调响应和通带到阻带过渡频率处的超陡滚降。子滤波器采用平衡梯形拓扑结构，使用浮动有源电感。测试结果表明，通过调整一个电路参数，可以实现宽范围的中频调谐，增益调谐超过20 dB，Q值调谐范围从2到19，中心频率偏移也达到了生物真实感。此外，该滤波器具有超过300 dB/dec的超陡滚降。通过改变偏置电流，该滤波器可以配置为工作在31 Hz至8 kHz的中心频率。该滤波器为9阶，功耗59.5 ~ 90.0 μW，芯片面积0.9mm2。该滤波器具有良好的生物逼真性、低功耗和体积小等优点，可用于听力假体设备、语音处理器以及其他仿生听觉系统的前端。
This paper presents the design and experimental results of a cochlea filter in analog very large scale integration (VLSI) which highly resembles physiologically measured response of the mammalian cochlea. The filter consists of three specialized sub-filter stages which respectively provide passive response in low frequencies, actively tunable response in mid-band frequencies and ultra-steep roll-off at transition frequencies from pass-band to stop-band. The sub-filters are implemented in balanced ladder topology using floating active inductors. Measured results from the fabricated chip show that wide range of mid-band tuning including gain tuning of over 20dB, Q factor tuning from 2 to 19 as well as the bio-realistic center frequency shift are achieved by adjusting only one circuit parameter. Besides, the filter has an ultra-steep roll-off reaching over 300 dB/dec. By changing biasing currents, the filter can be configured to operate with center frequencies from 31 Hz to 8 kHz. The filter is 9thorder, consumes 59.5 ~ 90.0 μW power and occupies 0.9 mm2chip area. A parallel bank of the proposed filter can be used as the front-end in hearing prosthesis devices, speech processors as well as other bio-inspired auditory systems owing to its bio-realistic behavior, low power consumption and small size.