AM-FM transmitter power amplifier
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United States of America Patent
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Nov 1, 1994
Issued Date -
N/A
app pub date -
May 17, 1993
filing date -
Nov 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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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