Dynamic allocation of power supplied by a power supply and frequency agile spectral filtering of signals
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United States of America Patent
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Jan 11, 2005
Grant Date -
Jun 20, 2002
app pub date -
Dec 15, 2000
filing date -
Dec 15, 2000
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Abstract
The power voltage supply for a power amplifier is switched between an operational full power mode and a reduced power mode by the switching of a dual state impedance device connected in series between the power amplifier and the power supply. A control circuit detects the level of a signal to be amplified by that amplifier and switches the impedance states thus reducing the power output capability of the power amplifier and placing the power amplifier into a reduced power mode. In one embodiment, the signal is produced by spectrally filtering with a low pass filter, with the cross-over frequency being adjustable. Additionally, the gain of the amplifier can be reduced for high level signals.
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