AMPLIFIER WITH BASE CURRENT REUSE

摘要

An RF amplifier module that has a plurality of amplifiers wherein at least one of the amplifiers is powered via an envelope tracking module. The biasing input of at least one of the amplifiers is provided to the first amplifier to power the first amplifier to reduce power consumption. The first amplifier may also be powered via fixed biasing to provide greater stability of the module.

主权项

1. A power amplifier module for an RF communications circuit, the module comprising:
a driver stage amplifier having an input that receives an RF signal, the driver stage amplifier powered by a supply voltage which is applied across the driver stage amplifier to amplify the RF signal; a final stage amplifier that receives an amplified RF signal from an output of the driver stage amplifier, that is powered by a supply voltage applied across the final stage amplifier, and that provides an amplified output signal, a bias current applied to the input of the final stage amplifier and applied to power the driver stage amplifier to reduce the current that flows through the driver stage amplifier; and an envelope tracking module that provides power to at least one of the driver stage amplifier and final stage amplifier.