Please wait a minute...
IMAGE/TABLE DETAILS
The Design of Low-power Wireless Neural Signal Acquisition Module
YUAN Xudong,ZHU Zhengfei
Electronic Science and Technology    2019, 32 (1): 16-20.   DOI: 10.16180/j.cnki.issn1007-7820.2019.01.004
Abstract   (335 HTML4 PDF(pc) (1331KB)(32)  

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.


Figure 2. Primary amplification circuit
Extracts from the Article
初级放大电路采用低功耗、低噪声的仪表放大器INA333[5]以及普通运算放大器OPA333[6]设计实现,如图2所示。神经信号首先经过电容C1C2耦合到电路中,经过由电容C1C2和电阻R1R2分别构成的RC高通滤波器,将直流信号滤除,其截止频率由式(1)确定。之后信号进入仪表放大器INA333中进行信号放大,其放大倍数由式(2)确定。运算放大器OPA333与电阻R3以及电容C5共同构成超级伺服环路以去除电路中产生的直流漂移电压,使得输出电压固定偏置为Vref值。
Other Images/Table from this Article