Efficient wide bandwidth envelope tracking power supply

Abstract

An envelope tracking power supply, which includes a parallel amplifier, switching circuitry, and a parallel switching supply, is disclosed. The envelope tracking power supply provides an envelope power supply signal to a load. The parallel amplifier regulates an envelope power supply voltage of the envelope power supply signal based on a setpoint of the envelope power supply voltage. The switching circuitry at least partially provides the envelope power supply signal via a first inductive element and drives an output current from the parallel amplifier toward zero. The parallel switching supply provides an assist current to further drive the output current from the parallel amplifier toward zero based on an estimate of a current in the first inductive element and an estimate of a current in the load.

Dependencies are inferred from the claim text.