Slow-wave neural signal amplification circuit

The invention relates to a slow-wave neural signal amplifying circuit, which comprises a filtering unit and an amplifying unit, and is characterized in that the filtering unit comprises a capacitor and a pseudo resistor; one end of the capacitor serves as a signal input end, the other end of the capacitor is connected with the first end of the pseudo resistor and the input end of the amplification unit, and the capacitor couples an input signal to the amplification unit; the second end of the pseudo resistor is connected with common-mode voltage, and the first end of the pseudo resistor is connected with the input end of the amplification unit and provides bias voltage for the amplification unit; by setting the impedance value of the pseudo resistor, the filtering cut-off frequency of the filtering unit reaches a target value, a filtering signal is obtained, and the filtering signal is amplified. According to the brain-computer interface signal acquisition circuit, the problem that the impedance is unstable d