| 摘要 |
A low noise receiving apparatus includes an amplifier which inputs an input signal, an output matching circuit which is connected between the amplifier and an output terminal which matches an impedance of an output side of the amplifier, a bypass circuit which bypasses the amplifier and is connected to an output side of the output matching circuit, and a switching circuit having one end connected between the amplifier and the output matching circuit and the other end connected to an alternating current ground which switches whether or not to connect an output of the amplifier to the alternating current ground. In a bypass mode, the switching circuit connects the output of the amplifier to the alternating current ground in order to have a lower impedance viewed from the output terminal of the output matching circuit than in an amplification mode.
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