Feedforward power amplifier for broadband operation
AssigneeSkyworks Solutions, Inc.
InventorDavid Richard Pehlke
Life of this patent
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Abstract
Broadband feedforward power amplifiers are disclosed herein. In certain embodiments, a broadband feedforward power amplifier includes a power amplifier electrically connected between a radio frequency (RF) input and an RF output, and a feedforward compensation circuit including a first amplifier electrically connected in parallel with the power amplifier, a load impedance, and a second amplifier electrically connected between the radio frequency input and the load impedance. The feedforward compensation circuit generates a compensation signal based on sensing an output of the first amplifier and an output of the second amplifier, and provides the compensation signal to the radio frequency output to thereby compensate the power amplifier for non-linearity.
Claims20
A broadband feedforward power amplifier comprising:
- a power amplifier electrically connected between a radio frequency input and a radio frequency output;
- and
- a feedforward compensation circuit including a first amplifier electrically connected in parallel with the power amplifier, a load impedance, and a second amplifier electrically connected between the radio frequency input and the load impedance, the feedforward compensation circuit configured to generate a compensation signal based on sensing an output of the first amplifier and an output of the second amplifier, and to provide the compensation signal to the radio frequency output.
A mobile phone comprising:
- a transceiver configured to generate a radio frequency transmit signal;
- and
- a front end system including a power amplifier configured to receive the radio frequency transmit signal at a radio frequency input and to provide an amplified radio frequency transmit signal at a radio frequency output, and a feedforward compensation circuit including a first amplifier electrically connected in parallel with the power amplifier, a load impedance, and a second amplifier electrically connected between the radio frequency input and the load impedance, the feedforward compensation circuit configured to generate a compensation signal based on sensing an output of the first amplifier and an output of the second amplifier, and to provide the compensation signal to the radio frequency output.
A method of power amplifier compensation, the method comprising:
- amplifying a radio frequency transmit signal using a power amplifier that is electrically connected between a radio frequency input and a radio frequency output;
- amplifying the radio frequency transmit signal using a first amplifier electrically connected in parallel with the power amplifier;
- amplifying the radio frequency transmit signal using a second amplifier electrically connected between the radio frequency input and a load impedance;
- and
- compensating the power amplifier for non-linearity using a compensation signal generated based on sensing an output of the first amplifier and an output of the second amplifier.
Dependencies are inferred from the claim text.