An electronic apparatus includes a processing unit. The processing unit, when detecting a frequency offset between an radio frequency (RF) module and a corresponding base station (BS), controls an oscillator to change a frequency of a first reference clock signal outputted therefrom by a first frequency variation, and controls a compensation unit to change a frequency of a second reference clock signal outputted therefrom by a second frequency variation. Wherein the compensation unit receives and adjusts the first reference clock signal from the oscillator to output the second reference clock signal, and the frequency offset substantially equals the first frequency variation plus the second frequency variation.