Switch semiconductor integrated circuit and communication termin

Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention

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455 82, 455 83, 327408, 327427, 333103, H04B 144, H03F 136

Patent

active

058129391

ABSTRACT:
In a switch semiconductor integrated circuit, a switch for high frequency signal is constituted by four field-effect transistor stages connected in series to the first to fourth signal paths arranged in a ring shape and two field-effect transistor stages connected which are in a shunt position with respect to the signal paths such that two signal paths are positioned between two field-effect stages which are opposite to each other. At this time, the same voltage is impressed to the signal paths which are in a position opposite to each other among four signal paths, and the control voltage which are complementary to each other is impressed to the adjacent signal paths. Therefore, the number of field-effect transistor stages connected in a shunt position with respect to the signal paths and the number of control lines necessary to control the switching control can be reduced comparing to a conventional one; thus a small-sized switch semiconductor integrated circuit can be realized comparing to a conventional switch.

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