Apparatus and methods for envelope trackers

摘要

Apparatus and methods for envelope trackers are disclosed herein. In certain configurations, a mobile device includes a power amplifier configured to amplify a radio frequency (RF) input signal to generate an RF output signal. The power amplifier is configured to receive power from a power amplifier supply voltage. The mobile device further includes a voltage converter configured to convert a battery voltage into a regulated voltage, and the voltage converter is configured to control a magnitude of the regulated voltage based on an error signal. The mobile device further includes an error amplifier configured to generate an output current based on an envelope of the RF input signal and to generate the power amplifier supply voltage by adjusting the magnitude of the regulated voltage using the output current. The error amplifier is further configured to control the error signal.

主权项

1. A mobile device comprising:
a power amplifier configured to amplify a radio frequency (RF) input signal to generate an RF output signal, wherein the power amplifier is configured to receive power from a power amplifier supply voltage; a voltage converter configured to convert a battery voltage into a regulated voltage, the voltage converter configured to control a magnitude of the regulated voltage based on an error signal; an error amplifier configured to generate an output current based on an envelope of the RF input signal and to generate the power amplifier supply voltage using the output current and the regulated voltage, the error amplifier including a first input configured to receive an envelope signal that changes in relation to the envelope of the RF input signal and a second input, the error amplifier further configured to control the error signal; and a feedback circuit electrically connected between the second input of the error amplifier and the power amplifier supply voltage.