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Pat. 10862428 United States, Int. Cl.22 H03F 1/30, H02M 3/07, H03F 1/02, H03F 3/189, H03F 3/19, H03F 3/21, H03F 3/24, H03F 3/68, H03M 1/66, H02M 3/158. Feed-forward envelope tracking : Appl. N 16/140991 : Filed 25.09.2018 : Pub. 08.12.2020 : / Stephan Henzler, Andreas Menkhoff, Thomas Eichler, Wolfgang Walthes, Alexander Belitzer, Yifan Wang ; Assignee Apple Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10862428/en?oq=US10862428.html (дата обращения: ДД.ММ.ГГГГ).