Mobile telephone transmitter with internal auxiliary matching ci

Details Mobile telephone transmitter with internal auxiliary matching ci Mobile telephone transmitter with internal auxiliary matching ci

1998-10-19

2000-06-27

Tsang, Fan

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

330306, 455114, 455553, 455 82, H04B 144

Patent

active

060816945

ABSTRACT:
Disclosed is a transmitter for switching and transmitting signals of plural frequency bands. For example, the signals of two frequency bands are switched and transmitted. For the transmission in a first frequency band, of transistors 104, 105 are turned off, whereby a power amplifying transistor 102 is matched by an input wide band matching circuit 101 and an output main matching circuit 103, so that the high efficiency linear amplification is accomplished. For the transmission in a second frequency band, the transistor 104 is turned on while the transistor 105 is turned off, whereby the power amplifying transistor 102 is matched by a capacitance 108 as well as the input wide band matching circuit 101 and the output main matching circuit 103, so that the high efficiency linear amplification is accomplished. An external switch for switching the matching circuits is thus unnecessary.

REFERENCES:
patent: 4593250 (1986-06-01), Lucas et al.
patent: 5423074 (1995-06-01), Dent
patent: 5548246 (1996-08-01), Yamamoto et al.
patent: 5784687 (1998-07-01), Itoh et al.
patent: 6023611 (2000-02-01), Bolin et al.

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