Ultra-low-power high sensitivity spike detectors based on modified nonlinear energy operator
Ultra-low-power high sensitivity spike detectors based on modified nonlinear energy operator
复制标题
基于改进非线性能量算子的超低功耗高灵敏度尖峰探测器
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Y. Massoud
中科院分区：
文献类型：
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作者：
Yang;Qingyun Ma;M. Haider;Y. Massoud
尖峰探测器是最先进的植入式神经记录微系统的重要数据压缩组件。本文提出了两种改进的尖峰检测算法：频率增强非线性能量算子（fNEO）和能量导数（ED），以解决传统非线性能量算子（NEO）在存在基线干扰的情况下灵敏度降低的问题。所提出的方法在两个采用标准 0.13μm CMOS 工艺的模拟尖峰检测器中实现。为了实现超低功耗设计，开发了基于弱反转 MOSFET 的乘法器、加法器和微分电路，以便与 0.5 V 电源配合使用。所提出的 fNEO 尖峰检测器和 ED 尖峰检测器的功耗分别为 258.7 nW 和 129.4 nW。基于检测到的尖峰的标准偏差和峰杂比的定量研究表明，所提出的尖峰检测器方案比传统的基于 NEO 的尖峰检测器具有更高的灵敏度。
Spike detectors are important data-compression components for state-of-the-art implantable neural recording microsystems. This paper proposes two improved spike detection algorithms, frequency-enhanced nonlinear energy operator (fNEO) and energy-of-derivative (ED), to solve the sensitivity reduction of a conventional nonlinear energy operator (NEO) in the presence of baseline interference. The proposed methods are implemented in two analog spike detectors with a standard 0.13-μm CMOS process. To achieve an ultra-low-power design, weak-inversion MOSFET based multipliers, adders and derivative circuits are developed to work with a 0.5 V power supply. The power dissipations of the proposed fNEO spike detector and the ED spike detector are 258.7 nW and 129.4 nW, respectively. Quantitative investigations based on the standard deviation and peak-to-clutter ratio of the detected spikes indicate that the proposed spike detector schemes hold higher sensitivity than the conventional NEO based spike detector.