Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1994-06-10
1995-12-12
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
4552771, 455 78, 333103, 327408, 327427, H04B 106
Patent
active
054758750
ABSTRACT:
An antenna switching circuit comprises a first amplifier including a first FET receiving a first receive signal from a first antenna at a gate of the first FET, and amplifying the first receive signal, and outputting the amplified signal via a drain of the first FET to an output terminal, and a second amplifier including a second FET receiving a second receive signal from a second antenna at a gate of the second FET, and amplifying the second receive signal and outputting the amplified signal via a drain of the second FET to the output terminal. The first and second FETs are coupled to receive, at their sources, first and second control signals complementary to each other so that one of the FETs is made active while the other is made inactive, depending on values of the first and second control signals. The consumption current is reduced, and in addition, an amplifier in a receiver provided to receive the output of the antenna switching circuit may be omitted.
REFERENCES:
patent: 4810911 (1989-03-01), Noguchi
patent: 5047674 (1991-09-01), Clark et al.
patent: 5081706 (1992-01-01), Kim
patent: 5193218 (1993-03-01), Shimo
patent: 5280633 (1994-01-01), Camiade et al.
Ando Hiroshi
Katsuyama Tsutomu
Faile Andrew
OKI Electric Industry Co., Ltd.
Urban Edward F.
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