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Pat. 10659887 United States, Int. Cl.22 H03F 3/217, H03F 3/183, H03F 3/187, H04R 3/00, H04R 17/00, H02M 1/00, H02M 3/07, H02M 3/158, H04R 1/10. High efficiency transducer driver : Appl. N 16/001596 : Filed 06.06.2018 : Pub. 19.05.2020 : / Eric J. King, Christian Larsen, Anthony S. Doy ; Assignee Cirrus Logic Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10659887/en?oq=US10659887.html (дата обращения: ДД.ММ.ГГГГ).