Duplexer circuit apparatus provided with amplifier and impedance

Wave transmission lines and networks – Plural channel systems – Having branched circuits

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Details

455 83, H01P 115, H04B 148

Patent

active

060669934

ABSTRACT:
A duplexer circuit apparatus includes (a) a transmission arm circuit including a first switching circuit which is connected between a transmitter and an antenna, is turned on during transmission, and is turned off during reception, and (b) a reception arm circuit including a second switching circuit which is connected between a receiver and the antenna, is turned off during transmission, and is turned on during reception. In the duplexer circuit apparatus, either the transmitter or the receiver is selectively connected to the antenna, and the transmission arm circuit further includes a cascode amplifier, and an impedance matching inductor connected between the cascode amplifier and the antenna. In this case, the cascode amplifier may be replaced by a source-grounded amplifier constituted by only the FET.

REFERENCES:
patent: 4637073 (1987-01-01), Selin et al.
patent: 5327583 (1994-07-01), Yamada et al.
patent: 5477184 (1995-12-01), Uda et al.
patent: 5774792 (1998-06-01), Tanaka et al.
patent: 5777530 (1998-07-01), Nakatuka
patent: 5784687 (1998-07-01), Itoh et al.
patent: 5883541 (1999-03-01), Tahara et al.

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