Telecommunications – Transmitter and receiver at same station – Convertible
Patent
1993-05-17
1994-11-01
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Convertible
455 93, 455126, 455127, 375 98, 330129, 330145, H04B 140, H04B 104, H03G 320, H03F 130
Patent
active
053614038
ABSTRACT:
A power amplifier used in a portable, radio frequency transmitter is switched between different modes of operation when transmitting differently modulated carriers. The first mode of operation corresponds to amplitude modulation (AM), while a second mode corresponds to angle modulation techniques such as frequency modulation (FM). A switching network alters the impedance of the power amplifier to match network for matching the impedance of the transmitter antenna in order to achieve maximum efficiency in each mode of operation. Various switching methods and impedance matching circuits are disclosed.
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Charouel Lisa
Eisenzopf Reinhard J.
Ericsson GE Mobile Communication Holding, Inc.
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