Control of power amplifiers in devices using transmit beamforming
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United States of America Patent
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Jul 21, 2009
Grant Date -
Jun 1, 2006
app pub date -
Jan 6, 2006
filing date -
Mar 21, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A transmitter comprises a plurality of transmit antennas for simultaneously transmitting weighted signals according to a channel transfer function. Each antenna has a corresponding amplifier that is bias controlled according to the transmit weights derived for the antenna transmission. A baseband processor produces digital weighted signals for upconversion and amplification by the amplifiers. Each amplifier is accompanied by a bias circuit responsive to the transmit weights. Alternatively, or additionally, corresponding DC/DC converters are used to control the operating voltage of the amplifiers.
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