A transceiver circuit is configured to couple an oscillation crystal. The transceiver circuit includes a local oscillator, a filter circuit, a control circuit, and a radio frequency signal generator circuit. The local oscillator includes a capacitive element. The local oscillator generates a phase locked loop signal based on an oscillation frequency of the oscillation crystal and a capacitance value of the capacitive element. The filter circuit generates a filtered signal according to the phase locked loop signal. The control circuit adjusts the capacitance value to be an adjusted capacitance value according to the filtered signal and the phase locked loop signal. The local oscillator further generates a calibrated local oscillation signal according to the oscillation frequency and the adjusted capacitance value. The radio frequency signal generator circuit generates a radio frequency signal according to the calibrated local oscillation signal and a baseband signal.