Doherty amplifier and signal amplification system having the same, method for amplifying signal
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United States of America Patent
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May 3, 2011
Grant Date -
Mar 4, 2010
app pub date -
Aug 24, 2009
filing date -
Aug 28, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A Doherty amplifier is provided. The Doherty amplifier includes a first path circuit including a carrier amplifier and a first impedance adjusting circuit connected with the carrier amplifier; and a second path circuit including a peaking amplifier, a second impedance adjusting circuit connected with the peaking amplifier, and a peaking amplifier bias circuit connected with the peaking amplifier. At least one among an impedance of the first impedance adjusting circuit, an impedance of the second impedance adjusting circuit, and a bias of the peaking amplifier bias circuit is adjusted in response to a control signal.
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