PURPOSE: A low noise amplifier and radio receiver are provided to eliminate common mode noise by adding a balun device which changes single ended radio frequency signals into differential radio frequency signals. CONSTITUTION: A first balun(110) changes single ended radio frequency signals into differential radio frequency signals. A second balun(120) amplifies a signal which is received from the first balun. A common source amplifier is connected to a cross-connection common gate differential amplifier(130) to be possible to be operated. The common source amplifier amplifies the signal of an input terminal and outputs the signal to an output terminal. The cross-connection common gate differential amplifier receives the signal which is amplified from the second balun and amplifies the signal.
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