Patent ID: 8089312

Claim:
An amplifying circuit with a bypassing function, comprising: an input terminal to which a signal is input from an antenna; an amplifier including an input port connected to the input terminal, and an output port; a first inductor connected between the input port and a ground; a bypass circuit including a first port connected to the input terminal, a second port connected to the output port of the amplifier, a first switch connected in series between the first port and the second port, the first switch being configured to be closed and opened, a capacitor connected in series to the first switch between the first port and the second port, and a second inductor connected in series to the first switch and the capacitor between the first port and the second port; and an output terminal connected to the output port of the amplifier; wherein the bypass circuit further includes a variable resistor connected in series to the first switch, the capacitor, and the second inductor between the first port and the second port.