An RF switch is disclosed. Power of an amplifier installed in an RF switch of a TV receiver is adjusted by using a Schmitt trigger circuit. If an output voltage of an RF automatic gain controller of a tuner is greater than a pre-set upper limit threshold value, the amplifier is turned on, whereas if an output voltage of an RF automatic gain controller of a tuner is smaller than a pre-set lower limit threshold value, the amplifier is turned off. Thus, a signal distortion phenomenon that may occur when an infinitesimal signal, a strong signal and several signals with high power levels are adjacent to each other can be avoided, so a performance of a receiving unit is improved.