An implantable multi-channel neural electrical signal acquisition circuit and its implementation method

Abstract

The invention discloses an implantable multi-channel electroneurographic signal acquisition circuit and an achieving method of the circuit. The circuit comprises an electrode array, an amplifier set, a reference signal generator, a modulator set, a signal summator, an upper frequency changer, a radio frequency transmitter and a multipath carrier generator. The output end of the electrode array sequentially passes through the amplifier set, the modulator set, the signal summator and the upper frequency changer to be connected with the input end of the radio frequency transmitter, the output end of the reference signal generator is connected with the input end of the modulator set, the output end of the multipath carrier generator is connected with the input end of the modulator set and the input end of the upper frequency changer. According to the circuit, the design that due to increasing of the number of channels, a high-isolation-degree high-speed channel switching switch and a high-precision high-speed analog-digital converter are needed is avoided, the structure is simple, and the design difficulty is low. The circuit is achieved through a basic analog circuit module, quantification of an analog-digital converter is not carried out, the quantification precision problem does not exist, the precision is high, and the circuit can be widely applied to the field of signal acquisition.

Description

technical field [0001] The invention relates to the field of signal acquisition, in particular to an implanted multi-channel neuroelectric signal acquisition circuit and its implementation method. Background technique [0002] The neural electrical signal acquisition circuit is a circuit that uses electrode probes in contact with biological tissues to sense the weak electrical signals generated by the electrical activity of nerve cells in the tissue, and amplifies, processes and transmits the weak electrical signals sensed. [0003] The structural framework of the neural electrical signal acquisition circuit is as follows: figure 1 As shown, it is mainly composed of five parts: electrode group, amplifier group, channel signal integration unit, channel signal transmission preprocessing unit, and channel signal transmission unit. The electrodes in the electrode group are implanted to sense the weak electrical signal generated by the activity of nerve cells in the tissue of th...

AI Technical Summary

Problems solved by technology

However, with the increase of the number of channels, the improvement of the channel signal sampling rate and sampling accuracy requirements, the high isolation and high-speed design of the channel switching switch and the low power consumption design of the analog-to-digital converter are becoming more and more difficult, which limits the acquisition Further increase in the number of channels, further improvement in acquisition accuracy, and further improvement in the signal bandwidth of each channel

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