Abstract: A bio-impedance measurement device, for measuring a bio-impedance, includes an electrode; a negative capacitance circuit, coupled to the electrode; a signal generator, configured to input a probing signal into the negative capacitance circuit; a demodulation circuit, coupled to the electrode and the negative capacitance circuit, configured to receive a first response signal related to the probing signal from the negative capacitance circuit and generate a first in-phase signal and a first quadrature-phase signal according to the first response signal, wherein the demodulation circuit and the electrode comprise an input capacitance; and a processor, coupled to the negative capacitance circuit and the demodulation circuit, configured to adjust the negative capacitance circuit to cancel the input capacitance according to the first in-phase signal and the first quadrature-phase signal.

Abstract: A bio-impedance measurement device, for measuring a bio-impedance, includes an electrode; a negative capacitance circuit, coupled to the electrode; a signal generator, configured to input a probing signal into the negative capacitance circuit; a demodulation circuit, coupled to the electrode and the negative capacitance circuit, configured to receive a first response signal related to the probing signal from the negative capacitance circuit and generate a first in-phase signal and a first quadrature-phase signal according to the first response signal, wherein the demodulation circuit and the electrode comprise an input capacitance; and a processor, coupled to the negative capacitance circuit and the demodulation circuit, configured to adjust the negative capacitance circuit to cancel the input capacitance according to the first in-phase signal and the first quadrature-phase signal.

Abstract: A bio-impedance measurement device includes a signal generator, configured to input a probing signal having a first frequency and an over-sampling pattern into a bio-impedance; a receiver, configured to receive a first response signal related to the probing signal from the bio-impedance; a demodulation circuit, coupled to the receiver, configured to generate a first in-phase signal and a first quadrature-phase signal according to the first response signal; and a processor, coupled to the signal generator and the demodulation circuit, configured to analyze the probing signal, the first in-phase signal and the first quadrature-phase signal to determine a bio-impedance value of the bio-impedance.