an input unit, configured to input a first input signal;

a clock unit, configured to generate a local oscillator signal;

a receiving link frequency-mixing unit, configured to obtain the first input signal and the local oscillator signal, and generate a first frequency-mixing signal according to the first input signal and the local oscillator signal; and

a calibration unit, configured to obtain first direct current offset information of the radio frequency receiving link, wherein the first direct current offset information is direct current offset information in the radio frequency receiving link when the receiving link frequency-mixing unit generates the first frequency-mixing signal;

wherein the receiving link frequency-mixing unit is further configured to obtain a second input signal and generate a second frequency-mixing signal according to the second input signal and the local oscillator signal, wherein the second input signal is input by the input unit according to the first input signal and the local oscillator signal; the calibration unit is further configured to obtain second direct current offset information of the radio frequency receiving link, and perform frequency calibration for the radio frequency receiving link according to the first direct current offset information and the second direct current offset information, wherein the second direct current offset information is direct current offset information in the radio frequency receiving link when the receiving link frequency-mixing unit generates the second frequency-mixing signal.