Composite amplifier
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United States of America Patent
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Oct 28, 2003
Issued Date -
N/A
app pub date -
Dec 5, 2002
filing date -
Jun 6, 2000
priority date (Note) -
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Abstract
A composite amplifier includes a main power amplifier (10) and an auxiliary power amplifier (12), which are connected to a load (26) over a Doherty output network. An attenuator (34) is provided for activating the auxiliary power amplifier (12) before the main amplifier (10) is saturated. Preferably the input drive voltage to the auxiliary power amplifier (12) is increased along a smooth curve as the input signal amplitude to the composite amplifier increases.
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