Envelope tracking supply modulator for power amplifier

An envelope tracking supply modulator for a power amplifier comprising:

• a multilevel or multiphase push-pull converter comprising:
• a control logic configured to generate a first control signal and a second control signal based on an envelope reference signal;
• a source multilevel converter configured to receive the first control signal and generate a source multilevel power supply signal;
• and
• a sink multilevel converter configured to receive the second control signal and generate a sink multilevel power supply signal;
• the envelope tracking supply modulator further comprising:
• a power recycling supply coupled to the sink multilevel converter and configured to sink a redundant current generated from the source multilevel converter and to provide power to a power amplifier driver and/or an envelope tracking supply modulator driver;
• and
• a low-pass filter, coupled to outputs of the source and sink multilevel converters, configured to filter the power supply signals generated from the source and sink multilevel converters to obtain a filtered power supply signal and provide the filtered power supply signal to the power amplifier.