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Current feedback amplifier used for electroencephalograph acquisition

A current feedback and amplifier technology, applied in applications, sensors, medical science, etc., can solve problems such as changes, chopper output ripple interference, and long circuit start-up time, so as to improve noise, increase manufacturing costs, and reduce power consumption Effect

Inactive Publication Date: 2017-04-26
东莞市维科应用统计研究所
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Problems solved by technology

However, the resistance value of the pseudo-resistor will change with the change of the voltage at both ends, and due to the large resistance value, the start-up time of the circuit is very long
The third is the chopper amplifier, which uses the chopper modulator to modulate the low-frequency 1 / f noise to high-frequency filtering to achieve low-noise design, but the chopper will introduce output ripple interference

Method used

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  • Current feedback amplifier used for electroencephalograph acquisition
  • Current feedback amplifier used for electroencephalograph acquisition
  • Current feedback amplifier used for electroencephalograph acquisition

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] refer to figure 1 , a current feedback amplifier for EEG acquisition, comprising:

[0019] The level conversion circuit, as shown in Figure 2, includes two resistors and a voltage follower, and a level conversion circuit is added between the output terminal and the input terminal of the M4 tube to realize the output rail-to-rail; The output to the rail attenuates to a smaller voltage range; the voltage follower converts the voltage to a range suitable for the M4 tube; V ＯＵＴ and V ｂ The relationship between is:

[0020] (1)

[0021] In the case of output rail-to-rail, in order to make the M4 tube work in the strong inversion area, design R a The value is much larger than R b . V b The small voltage range means that the transconductance of the M4 tube remains relatively constant, which can reduce the harmonic distortion caused b...

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Abstract

The invention provides a current feedback amplifier used for electroencephalograph acquisition. The amplifier comprises a level switching circuit used for achieving rail-to-rail output and a digital background mismatch calibration circuit used for calibrating differential electrodes and mismatching. The current feedback amplifier used for electroencephalograph acquisition has following beneficial effects: when the gain of the current feedback amplifier is 57dB, the maximal adjustable input mismatch is 3.1 mV; within the range from 0 to 100Hz, equivalent input noise is 1.5 [mu]V (rms) so that the acquisition demand of electroencephalographic signals is satisfied; on the condition of 1.8V power voltage, the current consumption is only 1.7 [mu]A; and the simulation result shows that circuits have good performance so that the acquisition demand for electroencephalograph signals are satisfied.

Description

technical field [0001] The invention belongs to the field of electronic amplifiers, and in particular relates to a current feedback amplifier for collecting brain electricity. Background technique [0002] EEG signals are widely used in clinical medical diagnosis. Traditional ECG and EEG signal acquisition instruments are bulky and consume high power, so they can only be used in hospitals and clinics. Wearable ECG and EEG signal acquisition systems are the future development trend, and amplifiers with low power consumption and low noise are indispensable modules. [0003] Low-power, low-noise instrumentation amplifiers used to collect ECG and EEG signals usually have three structures. One is a three-op-amp instrumentation amplifier, which has the advantages of high input impedance and high common-mode rejection ratio. However, since the three transconductance amplifiers jointly contribute noise, the noise performance of the three-op-amp instrumentation amplifier is relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0476A61B5/04
CPCA61B5/30A61B5/369
Inventor 不公告发明人
Owner 东莞市维科应用统计研究所
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