Power amplifier power detection for initiating retraining of digital pre-distortion
AssigneeSkyworks Solutions, Inc.
InventorSerge Francois Drogi
Life of this patent
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Abstract
Apparatus and methods for retraining digital pre-distortion are disclosed. In certain embodiments, a mobile device includes a transmit chain and a front end system. The transmit chain generates a transmit signal and converts the transmit signal to a radio frequency input signal, and includes a digital pre-distortion circuit that provides digital pre-distortion to the transmit signal. The front end system includes a power amplifier that amplifies the radio frequency input signal to generate a radio frequency output signal, and a power detector that generates a detection signal based on detecting an output power of the power amplifier. The detection signal controls initiation of a retraining sequence of the digital pre-distortion circuit.
Claims20
A mobile device comprising:
- a transmit chain configured to generate a transmit signal and to convert the transmit signal to a radio frequency input signal, the transmit chain including a digital pre-distortion circuit operable to provide digital pre-distortion to the transmit signal;
- and
- a front end system including a first power amplifier configured to amplify the radio frequency input signal to generate a radio frequency output signal, and a power detector configured to generate a detection signal based on detecting an output power of the first power amplifier, the detection signal operable to control initiation of a retraining sequence of the digital pre-distortion circuit in response to detecting a mismatch between an antenna and the first power amplifier.
A radio frequency transmit system for a mobile device, the radio frequency transmit system comprising:
- a digital pre-distortion circuit operable to provide digital pre-distortion to a transmit signal;
- a digital to radio frequency converter configured to convert the transmit signal to a radio frequency input signal;
- and
- a power amplifier module including a first power amplifier configured to amplify the radio frequency input signal to generate a radio frequency output signal, and a power detector configured to generate a detection signal based on detecting an output power of the first power amplifier, the detection signal operable to control initiation of a retraining sequence of the digital pre-distortion circuit in response to detecting a mismatch between an antenna and the first power amplifier.
A method of digital pre-distortion in a mobile device, the method comprising:
- generating a transmit signal using a digital transmit circuit of a transmit chain;
- providing digital pre-distortion to the transmit signal using a digital pre-distortion circuit of the digital transmit circuit;
- converting the transmit signal to a radio frequency input signal using a digital to radio frequency of the transmit chain;
- amplifying the radio frequency input signal to generate a radio frequency output signal using a first power amplifier;
- and
- generating a detection signal based on detecting an output power of the first power amplifier using a power detector, the detection signal operable to control initiation of a retraining sequence of the digital pre-distortion circuit in response to detecting a mismatch between an antenna and the first power amplifier.
Dependencies are inferred from the claim text.