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Pat. 10587187 United States, Int. Cl.22 H02M 3/07, H03F 1/02, H03F 3/185, H03F 3/187, H03F 3/68, H03G 1/00. Amplifier circuit and methods of operation thereof : Appl. N 15/597900 : Filed 17.05.2017 : Pub. 10.03.2020 : / John P. Lesso, John L. Pennock, Peter J. Frith ; Assignee Cirrus Logic Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US10587187/en?oq=US10587187.html (дата обращения: ДД.ММ.ГГГГ).