Transmission/reception integrated radio-frequency apparatus

摘要

There is provided a highly reliable transmission/ reception integrated radio-frequency (RF) apparatus which can achieve a high communication quality in a cable modem. A reception RF signal is input to a reception system block (100) via an input/output terminal (10), converted to an intermediate-frequency (IF) signal, and output from a terminal (122). An output terminal of a transmission processing section (206) of a transmission system block (200) is connected to the input/output terminal (10) via an overvoltage protection circuit (203), a high-pass filter (202) functioning as a countermeasure to overvoltage, and a low-pass filter (201) for suppressing harmonics produced from the high-pass filter (202).