ANTENNA CIRCUIT CAPABLE OF CONTROLLING OR BYPASSING GAIN OF PLURAL LNAS(LOW NOISE AMPLIFIERS)

摘要

PURPOSE: An antenna circuit is provided to enhance sensibility and improve IMD(Inter-Modulation Distortion) specification by controlling or bypassing each gain of plural LNAs(Low Noise Amplifiers). CONSTITUTION: An antenna circuit includes a duplexer, a selective amplifier, a controller, and a variable LNA. The duplexer(110) is used for transmitting a signal of an antenna. The selective amplifier(120) is used for amplifying or bypassing an output signal of the duplexer by a switching operation. The controller(130) is used for generating a gain selection signal for controlling an amplifying gain. The variable LNA(140) is used for controlling a gain according to the gain selection signal and amplifying an output signal of the selective amplifier.