Mixing Frequency Biology Impedance Measurement with Virtual Reference Point

In order to measure the character of the biology impedance at the same time and different frequency, the excitation method of multi-frequency and mixing frequency is used. As for the problem on the phase error led by general biology impedance measurement, a novel biology impedance measurement method based on virtual reference point was presented. According to the corresponding relationship between the reference resistance and the measured impedance in the vector space, the magnitude and phase of the measured impedance may be calculated. A prototype system based on the method was constructed and the experimental tests compared with the Agilent 4294A impedance analyzer show that the method is feasible