Amplifiers – With semiconductor amplifying device – Including distributed parameter-type coupling
Patent
1996-08-30
1998-06-23
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including distributed parameter-type coupling
330295, 330302, H03F 360, H03F 368
Patent
active
057709700
ABSTRACT:
The output of a digital modulator is put into a power amplifying device, is distributed into n pieces in an n-power divider in the power amplifier, passes through n input phase shifters differing individually in the phase change amount, is amplified by n power amplifiers, passes through n output phase shifters to match the phase of n signals, is combined in an n-power combiner, and is issued from an output terminal to a phase shifter, and the output of the phase shifter is issued to a transmission antenna. Herein, the phase value of the phase shifter is determined so as to extend the region of the output load impedance for satisfying the specific value of unwanted radiation, and so that the output load impedance range of the load impedance of the power amplifier may be optimize to the impedance change range of the trans missionantenna, thereby eliminating the isolator and presenting a transmitting device of a portable wireless system realizing smaller size, higher performance, and lower cost of portable wireless system.
REFERENCES:
patent: 4477781 (1984-10-01), Reuss
patent: 4803443 (1989-02-01), Takagi et al.
patent: 5055798 (1991-10-01), Heinzelmann
patent: 5661434 (1997-08-01), Brozovich et al.
Fuse Nobuo
Haruki Hiroshi
Ikeda Hikaru
Ishida Kaoru
Kosugi Hiroaki
Matsushita Electric - Industrial Co., Ltd.
Mottola Steven J.
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