Doherty power amplifier having AM-AM compensation
AssigneeSkyworks Solutions, Inc.
InventorPhilip John Lehtola
Life of this patent
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Abstract
A power amplification system includes a Doherty power amplifier (PA) configured to receive a voltage supply signal and a radio-frequency (RF) signal and generate an amplified RF signal using the voltage supply signal, the Doherty PA including a carrier amplifier and a peaking amplifier. A carrier amplifier bias circuit and a peaking amplifier bias circuit coupled to one or more of the carrier amplifier and the carrier amplifier bias circuit over a coupling path are provided wherein the peaking amplifier bias circuit is configured to provide a peaking bias signal to the peaking amplifier based on a saturation level of the carrier amplifier.
Claims20
A power amplification system comprising:
- a Doherty power amplifier configured to receive a voltage supply signal and a radio-frequency signal and generate an amplified RF signal using the voltage supply signal, the Doherty power amplifier including a carrier amplifier and a peaking amplifier;
- a carrier amplifier bias circuit;
- and
- a peaking amplifier bias circuit configured to receive a signal indicative of a DC base current of a bipolar transistor of the carrier amplifier and provide a peaking amplifier bias signal to the peaking amplifier based on the DC base current of the bipolar transistor of the carrier amplifier.
A radio-frequency module comprising:
- a packaging substrate configured to receive a plurality of components;
- and
- a power amplification system implemented on the packaging substrate, the power amplification system including a Doherty power amplifier configured to receive a radio-frequency signal and generate an amplified RF signal, the Doherty power amplifier including a carrier amplifier and a peaking amplifier, the power amplification system further including a carrier amplifier bias circuit and a peaking amplifier bias circuit coupled to one or more of the carrier amplifier and the carrier amplifier bias circuit over a coupling path and configured to receive a signal indicative of a saturation level of the carrier amplifier and provide a peaking amplifier bias signal to the peaking amplifier based on the signal indicative of the saturation level of the carrier amplifier.
A wireless device comprising:
- a transceiver configured to generate a radio-frequency signal;
- a front-end module in communication with the transceiver, the front-end module including a packaging substrate configured to receive a plurality of components, the front-end module further including a power amplification system implemented on the packaging substrate, the power amplification system including a Doherty power amplifier configured to receive the radio-frequency signal from the transceiver and generate an amplified radio-frequency signal, the Doherty power amplifier including a carrier amplifier and a peaking amplifier, the power amplification system further including a carrier amplifier bias circuit and a peaking amplifier bias circuit coupled to one or more of the carrier amplifier and the carrier amplifier bias circuit over a coupling path and configured to receive a signal indicative of a saturation level of the carrier amplifier and provide a peaking amplifier bias signal to the peaking amplifier based on the saturation level of the carrier amplifier;
- and
- an antenna in communication with the front-end module, the antenna configured to transmit the amplified radio-frequency signal.
Dependencies are inferred from the claim text.