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1. A transmitter, comprising: a power amplifier, configured to receive an input signal to generate an amplified input signal, wherein the amplified input signal is a differential signal; a transformer, configured to receive the amplified input signal to generate an output signal; a first adjusting circuit, configured to adjust a phase and an amplitude of a common mode signal of the amplified input signal to generate a first signal; a coupling circuit, configured to generate a coupled signal to the output signal according to the first signal; a control circuit, configured to control the first adjusting circuit to have a plurality of combinations in sequence, wherein the plurality of combinations comprise different phase and amplitude adjustments of the first adjusting circuit, respectively; and a harmonic intensity calculation circuit, wherein for the first adjusting circuit having any one of the combinations, the harmonic intensity calculation circuit calculates an intensity of a second harmonic of the output signal, so that the harmonic intensity calculation circuit generates a plurality of intensities of the second harmonics respectively corresponding to the plurality of combinations; wherein the control circuit further determines a specific combination among the plurality of combinations based on the plurality of intensities of the second harmonics corresponding to the plurality of combinations.
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