Envelope tracking power supply

Envelope Tracking Power Supply. By using an envelope tracking power supply that tracks the envelope of the RFPA. Reasons to Use Envelope Tracking. High Frequency GaN Transistors To meet the requirements for ET power supplies devices must operate efficiently at very high frequencies. Thus ET improves efficiency for high-PAR modulation at high average output power.

By adding an audio envelope signal to the FB pin the boost converters output voltage. Some of the requirements for the envelope tracking power supply include. The low-power step-down converter in the design features envelope-tracking capability to an audio power amplifier maintaining high efficiency across the output voltage range. It allows the power supply of the PA to be dynamically controlled by the envelope of the RF signal passing through the PA to increase the system efficiency. This reference design delivers an envelope-tracking power supply circuit for the PA TPA3128D2 and TPS3126D2 with boost controller TPS43061. This envelope-tracking power reference design maintains helps extend battery life in a portable audio applications such as Bluetooth or Wi-Fi speakers.

The ETPS is shown as an amplifier symbol to emphasize that this block must have dynamic performance normally associated with an amplifier.

The Envelope Tracking Power Supply ETPS uses the envelope shaping output to produce the variable supply voltage V PA that goes to the PA. The low-power step-down converter in the design features envelope-tracking capability to an audio power amplifier maintaining high efficiency across the output voltage range. By adding an audio envelope signal to the FB pin the TPS61088s output voltage can change in accordance with the envelope of the audio signal. This reference design delivers an envelope-tracking power supply circuit for the PA TPA3128D2 and TPS3126D2 with boost controller TPS43061. Thus the PA can always operate at high-efficiency. High Frequency GaN Transistors To meet the requirements for ET power supplies devices must operate efficiently at very high frequencies.