Multi-mode/multi-band power management system

A power management system for an RF PA load comprising:

• a first switching power supply adapted to provide a relatively constant DC voltage;
• a second switching power supply adapted to provide a dynamic DC voltage to the RF PA load, wherein the dynamic DC voltage is amplitude modulated in synchronization with the amplitude of a transmit signal that is to be amplified by the RF PA load;
• an electronic switch coupled between the first switching power supply and the RF PA load;
• and
• a control system that is adapted to close the electronic switch to supply the relatively constant DC voltage in addition to the dynamic DC voltage to the RF PA load in a first mode and to open the electronic switch wherein the relatively constant DC voltage is not supplied to the RF PA load in a second mode, and wherein the relatively constant DC voltage is based on an expected power output, and the dynamic DC voltage is based on an amplitude of a transmit signal being provided to the RF PA load for amplification.

A method for supplying power to an RF PA load, comprising:

• providing a power converter having a first switching power supply to provide a relatively constant DC voltage to the RF PA load and a second switching power supply to provide a dynamic DC voltage to the RF PA load, wherein the dynamic DC voltage is amplitude modulated in synchronization with the amplitude of a transmit signal that is to be amplified by the RF PA load, and an electronic switch for selectively coupling the first switching power supply to the RF PA load through a first output filter, and wherein the second switching power supply is coupled to the RF PA load through a second output filter;
• closing the electronic switch to supply the relatively constant DC voltage in addition to the dynamic DC voltage to the RF PA load in a first mode;
• and
• opening the electronic switch to remove the relatively constant DC voltage from the RF PA load in a second mode.