| 摘要 |
A high-frequency circuit device is provided that is conformable to both of the TDMA system and the CDMA system as well as a plurality of frequency bands and achieves low cost and low power consumption. The high-frequency circuit device has a configuration including a transmission amplifier circuit for transmitting high-frequency power from an antenna (4) that is composed of a high-frequency amplifier (22) that is shared in the TDMA system and the CDMA system, a duplexer (10) that is provided for performing simultaneous transmission/reception according to the CDMA system, upstream and downstream switch circuits (25, 27) in the direction of transmission that are provided so as to sandwich the duplexer between the transmission amplifier circuit and the antenna and are switched on when the simultaneous transmission/reception is performed according to the CDMA system, and a bypass switch circuit (26) that bypasses the upstream and downstream switch circuits and the duplexer. <IMAGE>
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