Power amplifier bias modulation for low bandwidth envelope tracking
AssigneeSkyworks Solutions, Inc.
InventorsSerge Francois Drogi, Philip John Lehtola, Florinel G. Balteanu
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Abstract
Apparatus and methods for power amplifier bias modulation for low bandwidth envelope tracking are provided herein. In certain embodiments, an envelope tracking system includes a power amplifier that amplifies an RF signal and a low bandwidth envelope tracker that generates a power amplifier supply voltage for the power amplifier based on an envelope of the RF signal. The envelope tracking system further includes a bias modulation circuit that modulates a bias signal of the power amplifier based on a voltage level of the power amplifier supply voltage.
Claims20
A mobile device comprising:
- a transceiver configured to generate a radio frequency signal;
- a front end circuit including a power amplifier configured to amplify the radio frequency signal;
- and
- a power management circuit including an envelope tracker configured to generate a power amplifier supply voltage of the power amplifier based on an envelope signal indicating an envelope of the radio frequency signal, the envelope tracker having a modulation bandwidth less than a full bandwidth of the radio frequency signal, the power management circuit further including a bias modulation circuit configured to modulate a bias of the power amplifier based on a voltage level of the power amplifier supply voltage.
An envelope tracking system comprising:
- a power amplifier configured to amplify a radio frequency signal;
- an envelope tracker configured to generate a power amplifier supply voltage of the power amplifier based on an envelope signal indicating an envelope of the radio frequency signal, the envelope tracker having a modulation bandwidth less than a full bandwidth of the radio frequency signal;
- and
- a bias modulation circuit configured to modulate a bias of the power amplifier based on a voltage level of the power amplifier supply voltage.
A method of envelope tracking, the method comprising:
- amplifying a radio frequency signal using a power amplifier;
- generating a power amplifier supply voltage of the power amplifier based on an envelope signal using an envelope tracker, the envelope signal indicating an envelope of the radio frequency signal, and the envelope tracker having a modulation bandwidth less than a full bandwidth of the radio frequency signal;
- and
- modulating a bias of the power amplifier based on a voltage level of the power amplifier supply voltage using a bias modulation circuit.
Dependencies are inferred from the claim text.