A wireless receiver, a wireless transceiver and a mobile terminal with the wireless receiver include a down-converter that can be used in common with respect to at least two different wireless communication systems using the same radio frequency band, and a local oscillation signal source capable of selecting an optimum C/N ratio for receiving at least two different wireless communication systems, wherein the local oscillation signal source is composed of a frequency divider, a switch, a first voltage controlled oscillator, a second voltage controlled oscillator, and a frequency synthesizer.