RF detector and method for detecting
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United States of America Patent
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Apr 26, 2016
Grant Date -
Jan 31, 2013
app pub date -
Oct 1, 2012
filing date -
Apr 12, 2010
priority date (Note) -
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Abstract
A circuit and method are provided for detecting a power of a signal amplified in a power amplifier. A diode and a voltage bias source are used to shift a voltage of the signal taken at a base of an amplifying transistor of the power amplifier, to generate a positive signal. The positive signal is provided to a base input of an emitter follower exhibiting high input impedance to generate a power detector output which follows the positive signal.
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