低功耗无线动物神经信号采集模块设计

doi:10.16180/j.cnki.issn1007-7820.2019.01.004

摘要/Abstract

摘要：

文中根据RF无线射频原理,提出了一个适用于小体型动物的纯模拟、低功耗的无线神经信号采集模块设计方案。相比于数模混合方案,纯模拟的实现方案具有尺寸小、功耗低以及结构简单等优势。整个采集模块可以分为模拟前端放大和无线数据传输两部分。通过选用低功耗、低噪声的仪表放大器INA333和运算放大器OPA333构成模拟前端放大电路的两级放大结构,降低了电路的功耗和尺寸。通过添加反馈电感实现的反馈增强效应降低了Colpitts振荡器功耗。采用三极管极间电容对振荡器进行FM调制构成纯模拟无线数据传输电路,使得采集模块具有小尺寸、低功耗以及无线数据传输的特点。电路仿真以及实验测试结果均表明,该模块可以完成动物神经信号的无线采集,具有一定的实用性。

关键词: 神经信号, 无线采集, 低功耗, 小尺寸, 反馈增强效应, FM

Abstract:

In this paper, RF radio frequency principle is used to design a pure analog low power wireless neural signal acquisition module suitable for small animals. Compared with digital-analog hybrid scheme, the pure analog implementation had the advantages of small size, low power consumption and simple structure. The acquisition module were divided into two parts including analog front-end amplification and wireless data transmission. With the use of low-power, low-noise instrumentation amplifier INA333 and OPA333 op amp analog front-end amplifier, a two-stage amplifier structure was formed and the power consumption and size of the circuit was reduced. The feedback enhancement effect achieved by adding a feedback inductor reduced the power consumption of the Colpitts oscillator. The FM modulation of the oscillator used the inter-polar capacitance of the transistor to form a pure analog wireless data transmission circuit, so that the acquisition module had the advantages of small size, low power consumption and wireless data transmission features. Circuit simulation and experimental test results both showed that the module could complete the wireless acquisition of animal neural signals and had a certain practicality.

Key words: neural signal, wireless recording, low power consumption, small-size, feedback enhancement effect, FM

中图分类号:

TN752

原旭东,朱政飞. 低功耗无线动物神经信号采集模块设计[J]. 电子科技, 2019, 32(1): 16-20.

YUAN Xudong,ZHU Zhengfei. The Design of Low-power Wireless Neural Signal Acquisition Module[J]. Electronic Science and Technology, 2019, 32(1): 16-20.

图/表 14

图1

图2

图3

图4

图5

图6

图7

图8

图9

图10

图11

表1

图12

图13

参考文献 17

[1]	Hawley E S, Hargreaves E L, Kubie J L , et al. Telemetry system for reliable recording of action potentials from freely moving rats[J]. Hippocampus, 2002,12(4):505-513. doi: 10.1002/hipo.10040 pmid: 12201635
[2]	Jürgens U, Hage S R . Telemetric recording of neuronal activity[J]. Methods, 2006,38(3):195-201. doi: 10.1016/j.ymeth.2005.08.005 pmid: 16497514
[3]	周寅 . 运动型脑机接口中神经元峰电位记录与检测的关键技术研究[D]. 杭州:浙江大学, 2017.
[4]	李晓艳 . 对自由活动大鼠中枢神经信号的采集与处理系统的研究[D]. 青岛:山东科技大学, 2007.
[5]	Texas Instrument . INA333 Micro-Power (50μA), Zero-Drift, Rail-to-Rail out instrumentation amplifier[M]. Dallas:Texas Instrument, 2008.
[6]	Texas Instrument . OPAx333 1.8-V, microPower, CMOS operational amplifiers, Zero-Drift series[M]. Dallas: Texas Instrument, 2006.
[7]	Aparicio R, Hajimiri A . A noise-shifting differential Colpitts VCO[J]. IEEE Journal of Solid-State Circuits, 2002,37(12):1728-1736. doi: 10.1109/JSSC.2002.804354
[8]	Lai W C, Jang S L, Su S S, et al. Ultra low power Colpitts VCO with body-bias voltage controled technique [C]. Taipei:IEEE International Symposium on Radio-Frequency Integration Technology, 2016.
[9]	Ha K W, Ryu H, Lee J H , et al. Gm-boosted complementary current-reuse colpitts VCO with low power and low phase noise[J]. IEEE Microwave & Wireless Components Letters, 2014,24(6):418-420. doi: 10.1109/LMWC.2014.2313582
[10]	汶迎春, 赵素梅, 赵健 . 压控振荡器组件的改进设计[J]. 电子科技, 2012,25(8):20-22. doi: 10.3969/j.issn.1007-7820.2012.08.007
	Wen Yingchun, Zhao Sumei, Zhao Jian . Improved design of voltage controlled oscillator components[J]. Electronic Science and Technology, 2012,25(8):20-22. doi: 10.3969/j.issn.1007-7820.2012.08.007
[11]	Hou J A, Wang Y H . A 7.9 GHz low-power PMOS colpitts VCO using the gate inductive feedback[J]. IEEE Microwave and Wireless Components Letters, 2010,20(4):223-225. doi: 10.1109/LMWC.2010.2042559
[12]	Rottava R E, Camara S J C,Rangeld S F ,et al. Ultra-low-power,ultra-low-voltage 2.12 GHz colpitts oscillator using inductive gate degeneration [C]. Pairs:New Circuits and Systems Conference, 2013.
[13]	Poddar A . Slow wave resonator based tunable multi-band multi-mode injection-locked oscillators[J].IEEE Transactions on Circuit, 2014(8):579-586.
[14]	Rottava R E, Camara S J C,Rangel d S F ,et al. Ultra-low-power 2.4 GHz Colpitts oscillator based on double feedback technique [C].Beijing:IEEE International Symposium on Circuits and Systems, 2013.
[15]	Chae M, Chen K, Liu W, et al. A 4-channel wearable wireless neural recording system [C].Seattle:IEEE International Symposium on Circuits and Systems,IEEE, 2008.
[16]	Farshchi S, Mody I, Judy J W. A TinyOS-based wireless neural interface [C].San Francisco:Conference Proceeding of IEEE Engineering in Medicine and Biology Society, 2004.
[17]	Mohseni P, Najafi K, Eliades S J , et al. Wireless multichannel biopotential recording using an integrated FM telemetry circuit[J]. IEEE Transactions on Neural Systems & Rehabilitation Engineering, 2005,13(3):263-271. doi: 10.1109/TNSRE.2005.853625 pmid: 16200750

参数	文献[15]	文献[16]	文献[17]	本文
供电电压/V	±1.5	3	±1.5	3
放大倍数/dB	70	46	43.7	58
放大宽带/Hz	0.1~20 k	1~240	0.1~10 k	0.5~10 k
射频频率/MHz	433	916	96	433
模块功耗/mW	7	75	0.77	0.75
模块尺寸/mm²	39×44	26×26	5×12	20×25