Doherty power amplifier system
AssigneeQorvo US, Inc.
InventorsGeorge Maxim, Nadim Khlat, Baker Scott
Life of this patent
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Abstract
A Doherty amplifier system is disclosed. The Doherty amplifier system includes a carrier amplifier having a carrier input and a carrier output, and a peaking amplifier having a peaking input coupled to the carrier input and a peaking output coupled to the carrier output. Analog pre-distortion circuitry is configured to linearize the carrier amplifier and linearize the peaking amplifier by compensating for base-to-collector capacitance loading of the carrier amplifier and the peaking amplifier during operation.
Claims34
A Doherty amplifier system comprising:
- a carrier amplifier having a carrier input and a carrier output;
- a peaking amplifier having a peaking input coupled to the carrier input and a peaking output coupled to the carrier output;
- and
- analog pre-distortion (APD) circuitry configured to linearize the carrier amplifier and linearize the peaking amplifier by compensating for base-to-collector capacitance (Cbc) loading of the carrier amplifier and the peaking amplifier during operation, wherein the APD circuitry is configured in response to detectors to adjust gain of a carrier amplification path that includes the carrier amplifier.
A method of operating a Doherty amplifier system comprising:
- providing a carrier amplifier having a carrier input and a carrier output;
- providing a peaking amplifier having a peaking input coupled to the carrier input and a peaking output coupled to the carrier output;
- providing analog pre-distortion (APD) circuitry;
- and
- linearizing the carrier amplifier by way of the APD circuitry compensating for base-to-collector capacitance (Cbc) loading of the carrier amplifier during operation wherein the APD circuitry is configured in response to detectors to adjust gain of a carrier amplification path that includes the carrier amplifier.
A wireless communication device comprising:
- a baseband processor;
- transmit circuitry configured to receive encoded data from the baseband processor and modulate a carrier signal with the encoded data, wherein the transmit circuitry comprises:
- a carrier amplifier having a carrier input configured to receive the carrier signal and a carrier output;
- a peaking amplifier having a peaking input coupled to the carrier input and a peaking output coupled to the carrier output;
- and
- APD circuitry configured to linearize the carrier amplifier and linearize the peaking amplifier by compensating for base-to-collector capacitance (Cbc) loading of the carrier amplifier and the peaking amplifier during operation;
- wherein the APD circuitry is configured in response to detectors to adjust gain of a peaking amplification path that includes the peaking amplifier;
- and
- at least one antenna coupled to the transmit circuitry to transmit the carrier signal.
Dependencies are inferred from the claim text.