Patent ID: 8654909

Claim:
A semiconductor integrated circuit compliant with a wireless communication standard in which transmission and reception are performed using a time division method, the semiconductor integrated circuit comprising: an amplifier, an input of the amplifier being connected to an input terminal, a received input signal being inputted into the input terminal, the amplifier outputting an amplified signal; an interference wave suppression unit comprising a filter being controlled to be on or off, the filter configured to suppress an interference wave component of the amplified signal to output the signal as an output signal to an output terminal when the filter is on, the interference wave suppression unit configured to output the amplified signal as the output signal to the output terminal when the filter is off; a coupler configured to detect the input signal or the output signal; and a filter control circuit configured to control the filter to be on when a signal level of a detection input signal or a detection output signal detected by the coupler is greater than or equal to a reference value, and configured to control the filter to be off when the signal level is smaller than the reference value, at arbitrary determination timing in a period of time between the transmission and the reception, the period of time being an interference wave detection time period.