Radio-frequency power amplifier with amplitude modulation to phase modulation (AMPM) compensation
AssigneeApple Inc.
InventorSaihua Lin
Life of this patent
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Abstract
An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. A power amplifier may include a phase distortion compensation circuit. The phase distortion compensation circuit may include one or more n-type metal-oxide-semiconductor capacitors configured to receive a bias voltage. The bias voltage may be set to provide the proper amount of phase distortion compensation.
Claims20
A radio-frequency power amplifier comprising:
- an input transistor having a gate terminal configured to receive a radio-frequency input signal, a source terminal coupled to a first power supply line, and a drain terminal coupled to a power amplifier output terminal;
- an inductor having a first terminal coupled to the power amplifier output terminal and a second terminal coupled to a second power supply line different than the first power supply line;
- and
- an n-type metal-oxide-semiconductor capacitor coupled to the power amplifier output terminal and having a body terminal configured to receive a bias voltage from a voltage line different than the first and second power supply lines.
A method of operating a radio-frequency power amplifier, comprising:
- receiving at an input transistor a radio-frequency signal from an antenna;
- loading an output terminal of the radio-frequency power amplifier with an inductor;
- and
- compensating amplitude modulation to phase modulation (AMPM) distortion using an n-type metal-oxide-semiconductor capacitor coupled to the output terminal of the radio-frequency power amplifier.
An electronic device comprising:
- one or more processors configured to generate baseband signals;
- a transceiver configured to generate radio-frequency signals based on the baseband signals;
- and
- power amplifier circuitry configured to amplify the radio-frequency signals for wireless transmission by an antenna, the power amplifier circuitry having
- a first input transistor having a first source-drain terminal coupled to a ground line, a second source-drain terminal coupled to a first output terminal, and a gate terminal configured to receive the radio-frequency signals from the transceiver,
- a second input transistor having a first source-drain terminal coupled to the ground line, a second source-drain terminal coupled to a second output terminal, and a gate terminal configured to receive the radio-frequency signals from the transceiver,
- a first inductor coupled between the first output terminal and a positive power supply line,
- a second inductor coupled between the second output terminal and the positive power supply line, and
- an amplitude modulation to phase modulation (AMPM) compensation circuit coupled to the first and second output terminals, the AMPM compensation circuit having at least one n-type metal-oxide-semiconductor capacitor having a body terminal configured to receive a bias voltage.
Dependencies are inferred from the claim text.