Method and Apparatus for Correcting Inconvenient Power Amplifier Load Characteristics in an Envelope Tracking Based System

摘要

A tunable matching network is configured to couple at least one filter with a power amplifier that is configured to operate in an envelope tracking (ET) mode of operation over a transmit band. A control component is configured to detect a present set of operating conditions of the power amplifier when the power amplifier operates in the ET mode of operation. The present set of operating conditions comprises a present frequency of operation, and the control component is further configured to transmit a control signal to the tunable matching network in response to the detected present set of operating conditions. The tunable matching network is further configured to adjust an impedance of the tunable matching network in response to the transmitted control signal such that one or more ET characteristics are optimized based at least in part on the present set of operating conditions.

主权项

1. A system for envelope tracking, comprising:
a tunable matching network configured to couple to at least one filter and to a power amplifier that is configured to operate in an envelope tracking (ET) mode of operation over a transmit band; and a control component configured to detect a present set of operating conditions of the power amplifier when the power amplifier operates in the ET mode of operation, wherein the control component is further configured to transmit a control signal to the tunable matching network in response to the detected present set of operating conditions, wherein the tunable matching network is further configured to adjust an impedance of the tunable matching network in response to the transmitted control signal to optimize one or more ET characteristics of the power amplifier based at least in part on the present set of operating conditions, wherein the transmit band comprises two or more sub-bands, wherein a first sub-band of the two or more sub-bands comprises the present frequency, and wherein the one or more ET characteristics are optimized over the first sub-band, and wherein the transmit band is divided into the two or more sub-bands based at least in part on a frequency response of an input impedance of the at least one filter.