Signal adjustment device and signal adjustment method

A signal adjustment method, comprising:

• receiving a two-tone signal from a signal generator and generating a first signal according to the two-tone signal, wherein the signal generator generates the two-tone signal according to a first coefficient and a second coefficient;
• filtering the first signal, in order to generate a second signal;
• and
• detecting a power of an intermodulation distortion from a third order (IMD3) signal component, which is associated with the two-tone signal, in the second signal, and adjusting at least one of the first coefficient and the second coefficient according to the power, in order to reduce the power,
• wherein the two-tone signal comprises a first signal component, a second signal component, the first signal component and the second signal component have a frequency offset, and a frequency of the IMD3 signal component is twice the frequency offset.

A signal adjustment method, comprising:

• receiving a two-tone signal from a signal generator and generating a first signal according to the two-tone signal, wherein the signal generator generates the two-tone signal according to a first coefficient and a second coefficient;
• filtering the first signal, in order to generate a second signal;
• and
• detecting a power of an intermodulation distortion from a third order (IMD3) signal component, which is associated with the two-tone signal, in the second signal, and adjusting at least one of the first coefficient and the second coefficient according to the power, in order to reduce the power,
• wherein the two-tone signal comprises a first signal component and a second signal component, the first signal component or the second signal component has an absolute frequency, and a frequency of the IMD3 signal component is not correlated with the absolute frequency.