High efficiency power amplifier
AssigneeMotorola, Inc.
InventorsGustavo D. Leizerovich, Lawrence F. Cygan
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Abstract
A high efficiency power amplifier 600 consists of a non-linear radio frequency (RF) Doherty power amplifier (67) and a linearization circuit, such as, for example, a Cartesian Feedback circuit (33), an RF feedback circuit (38), an IF feedback circuit (48), or a feedforward circuit (55). The Doherty amplification stage (67) may be implemented with a BJTs, FETs, HBTs, H-FETs, PHEMTs, or any other type power transistor technology or device.
Claims18
A high efficiency power amplifier comprising:
- a Doherty amplifier stage, having an input path, for amplifying an input signal and producing an output corresponding thereto, said Doherty amplifier stage exhibiting non-linear amplitude and phase characteristics;
- and
- a Cartesian feedback linearization circuit, coupled to the Doherty amplifier stage, said Cartesian feedback linearization circuit responsive to receipt of the output for generating an error signal that is subtracted from the input path in order to linearize and correct the non-linear amplitude and phase characteristics of the output.
A high efficiency power amplifier circuit having an input path, said circuit comprising:
- a power splitter for receiving an input signal and providing a first and a second output signal, said first and said second output signal having a different phase;
- an amplifier stage, coupled to the power splitter, having a carrier amplifier for amplifying said first output signal and a peak amplifier for amplifying said second output signal;
- a combiner, coupled to the amplifier stage, for producing an output corresponding thereto, said output exhibiting non-linear amplitude and phase characteristics;
- and
- a Cartesian feedback linearization circuit, coupled to the combiner, said Cartesian feedback linearization circuit responsive to receipt of the output for generating an error signal that is subtracted from the input path in order to linearize and correct the non-linear amplitude and phase characteristics of the output.
A radio frequency (RF) communications device having a high efficiency power amplifier, said power amplifier comprising:
- a Doherty amplifier stage for amplifying an input and producing an output corresponding thereto, said Doherty amplifier stage exhibiting non-linear amplitude and phase characteristics;
- and
- a Cartesian feedback linearization circuit, coupled to the Doherty amplifier stage, said Cartesian feedback linearization circuit responsive to receipt of the output for linearizing and correcting the non-linear amplitude and phase characteristics of the output.
Dependencies are inferred from the claim text.