An 85.6%-Efficiency Supply Modulator with Auxiliary Bidirectional Power for 200MHz 5G NR Applications

To meet high bandwidth and wide output range requirements while achieving high efficiency in 5G envelope tracking (ET), the proposed Auxiliary Bidirectional Power (ABP) supply modulator recycles excessive energy to the auxiliary capacitor (C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">AUX</inf>) and optimizes the linear amplifier's supply voltage via droop mechanism combined with the adaptive voltage supply, achieving peak efficiency of 85.6%. The measured PA output spectrum shows -38.97dBc/-38.34dBc ACLR at NR 200MHz 26dBm