Signal acquisition processing circuit for digital brain electrical activity mapping instrument
A signal acquisition and processing circuit technology, applied in electrical components, medical science, impedance network, etc., can solve problems such as poor stability, equipment susceptible to interference, branch imbalance, etc., to improve acquisition sensitivity and stability , the effect of suppressing common mode interference
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[0016] An embodiment of a signal acquisition and processing circuit of a digital electroencephalography topographer, the circuit of the signal acquisition and processing circuit connected sequentially from the signal acquisition input includes a follow-up low-pass filter circuit 1, a differential amplifier circuit 2, and a voltage amplifier circuit 3,50 Hz power frequency notch circuit 4, two-stage operational amplifier circuit 5, two-stage active low-pass filter circuit 6, A / D conversion circuit 7, the A / D conversion circuit is connected to a computer with analysis software 9 through a photoelectric isolation circuit 8 Wherein, what A / D conversion circuit adopted is the microprocessor chip MSP430F147 with A / D conversion function, and described voltage amplifying circuit adopts operational amplifier TLC2254CDR or LF444, makes also have very high input impedance when low frequency, thereby It has strong AC coupling capability, the two-stage operational amplifier circuit is a gen...
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