| 摘要 |
PROBLEM TO BE SOLVED: To reduce a circuit area and a circuit current by reducing the number of circuit elements. SOLUTION: A switch SW10 is inserted into a route from an inverted output terminal of an amplifier 51 up to an inverted input terminal of an amplifier 50, a switch SW11 is inserted into a route from a non-inverted output terminal of the amplifier 51 up to a non-inverted input terminal of the amplifier 50, a switch SW12 is inserted into a route from a non-inverted output terminal of the amplifier 50 up to a non-inverted input terminal of the amplifier 51, and a switch SW13 is inserted into a route from an inverted output terminal of the amplifier 50 up to a non-inverted input terminal of the amplifier 51. In response to a control signal S14, ON/OFF of the switches (SW10, SW11, SW12, SW13) is controlled and the connection/disconnection of the routes is controlled to switch a band to be band-limited to a low-IF type band or a zero-IF type band. COPYRIGHT: (C)2009,JPO&INPIT
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