Power management circuit supporting fast voltage switching with reduced rush current

Abstract

A power management circuit supporting fast voltage switching with reduced rush current is provided. The power management circuit is configured to provide an average power tracking (APT) voltage to a power amplifier circuit for amplifying an analog signal. Moreover, the power management circuit must be able to adapt the APT voltage frequently and rapidly to enable such application as dynamic power control. In embodiments disclosed herein, the power management circuit can be configured to opportunistically activate a voltage amplifier, which is typically used to generate an envelope tracking (ET) voltage, at an appropriate time to help support fast switching of the APT voltage. As a result, the power management circuit is able to adapt the APT voltage frequently and rapidly. Furthermore, by utilizing the voltage amplifier to support fast switching of the APT voltage, it is also possible to reduce rush current in the power management circuit.

Dependencies are inferred from the claim text.