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Digital biopotential acquisition system with 8 channels

A biological and recording system technology, applied in the field of neural implants, can solve problems such as contact corrosion and increased power consumption of amplifiers

Active Publication Date: 2022-04-05
NEUROLOOP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] 1. It has a residual DC current of 20nA from the electrode-tissue interface, which can lead to corrosion at the contacts in the long term, and
[0019] 2. The technique is "open loop", which causes the gain to be a random variable, which is a problem for "true three-way vocal arrangements" for cuff electrode recordings
[0021] This requirement increases the power dissipation of the amplifier

Method used

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  • Digital biopotential acquisition system with 8 channels
  • Digital biopotential acquisition system with 8 channels
  • Digital biopotential acquisition system with 8 channels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] LNA preamplifier

[0041] It is known that the first stage (preamplifier) ​​is the most important stage in the amplifier chain because it is the most susceptible part to noise. For this reason, a fully differential scaling architecture has been used.

[0042] figure 2 The architecture shown in provides a single stage with moderately high gain and bandwidth, and theoretically unlimited common-mode rejection ratio (CMRR) and unlimited noise rejection (PSRR).

[0043] The equation for the amplifier channel is known and rephrased for g m / I D Design method, the noise model is as follows:

[0044]

[0045] and pass the function:

[0046]

[0047] as well as

[0048]

[0049] Legend:

[0050]

(1)

[0051]

(2)

[0052]

(3)

[0053] R F Feedback resistanceΩ

[0054] βMOSFET Transistor Current Amplification A / V 2

[0055] I SS Polarization current A for FD telescopic amplifier

[0056] use image 3 The marked PMOS transistors and the optimu...

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PUM

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Abstract

The invention relates to a digital biopotential acquisition system with 8 channels. In particular, the present invention relates to a biocompatible recording system for acquiring electronic information from the nervous system of a living being, said biocompatible recording system comprising a preamplifier stage and a further amplifier stage, wherein the second amplifier an input of a stage coupled to the output of the preamplifier; and a low pass filter having a capacitance multiplier connected to the amplifier of the second stage. The preamplifier of the recording system is designed using P-MOS technology.

Description

technical field [0001] The present invention relates to biocompatible neural implants for recording neural signals of living beings. Specifically, the present invention discloses an acquisition system for neural signals in a chip implanted in a living being. Background technique [0002] Biopotentials are electrical potentials measured between points in living cells, tissues, and organic tissues and occur in conjunction with all biochemical processes. The transfer of information between and within cells is also described. Electricity (voltage, current, or field strength) is caused by chemical reactions of charged ions. The term is further used in describing the transfer of information between and within cells (eg, in signaling). [0003] Neural implants can electrically stimulate, trap and block (or even simultaneously trap and stimulate) signals from a single neuron or group of neurons in an organism (biological neural network). [0004] The present invention discloses ...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B5/25
CPCA61B5/6846A61B5/7203A61B5/24A61B5/333A61B5/389H03F3/45179H03F2200/129H03F2200/144H03F2200/171H03F2203/45024H03F2203/45116H03F2203/45526
Inventor 马蒂亚斯·库尔伊奥诺斯·马诺利丹尼斯·普拉查托马斯·斯蒂格利茨奥斯卡·科塔
Owner NEUROLOOP
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