Envelope tracking system for dynamically adjusting gain compression of power amplifier in response to number of active resource blocks in channel bandwidth, associated envelope tracking method, and associated envelope tracking supply modulator circuit
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United States of America
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Nov 12, 2024
Grant Date -
Jun 8, 2023
app pub date -
Nov 22, 2022
filing date -
Nov 22, 2022
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Abstract
An envelope tracking system includes an envelope tracking digital baseband (ETDBB) circuit, a digital-to-analog converter circuit, and an envelope tracking supply modulator (ETSM) circuit. The ETDBB circuit performs envelope detection upon a transmit (TX) baseband signal to generate an envelope detection result, and generates a digital envelope input according to the envelope detection result. The digital-to-analog converter circuit converts the digital envelope input into a supply envelope signal. The ETSM circuit generates a modulated supply voltage according to the supply envelope signal, and outputs the modulated supply voltage to a power amplifier. At least one of the ETDBB circuit and the ETSM circuit dynamically adjusts gain compression (GC) of the PA in response to a number of active resource blocks (RBs) in a channel bandwidth.
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