Alternating current impedance measuring circuit with correction function

The invention discloses an alternating current impedance measuring circuit with a correction function. The alternating current impedance measuring circuit is characterized in that only one correction impedance is needed, a switching circuit is matched, and the equivalent impedance of the switching circuit, the gain of the circuit and the phase offset can be calculated according to the measuring results of two correction modes. According to the results, the equivalent impedance value of the switching circuit is deducted from the measuring results of the measuring modes, and the alternating current conductance value and the alternating current conductance phase value of the impedance to be measured can be accurately calculated. In addition, the phase difference of an input sine wave signal and a sampling frequency signal is adjusted, the impedance value of the same phase and the impedance value of the quadrature phase can be obtained, and the alternating current impedance value and the phase angle of the impeda