Embedded electroencephalogram impedance measurement system
An impedance measurement and embedded technology, applied in the field of EEG signal measurement system, can solve the problems of inconvenience, large fluctuation of impedance value, low frequency of excitation current source, etc., and achieve the effect of small space occupation and high integration
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[0009] The embedded brain electrical impedance measuring system of the present invention, the overall structural block diagram figure 1 The calculation and storage of the signal acquisition system, the control system, and the impedance value is included.
[0010] The signal acquisition system part uses 24-bit high-precision A / D integrated chip ADS1299, including programmable gain amplification, filtering, A / D conversion, impedance measurement, etc., wherein the sample rate is 250 Hz to 16kHz, and an ADS1299 chip contains 8 Passage, each channel uses a low pressure differential interface, and the signal gain of each channel is amazed, and each channel is separate with an excitation current source for the leading falling. This chip can be integrated with the impedance measurement portion, which greatly reduces the volume of the acquisition system. The external space is filled with signals of each frequency, and we need is an ecpoC signal, which is a low frequency weak signal, a...
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