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Pat. 11050433 United States, Int. Cl.22 H03M 1/74, H02M 3/158, H03M 3/00, H04R 3/00. Using a tracking switched-mode power supply to increase efficiency of a current digital-to-analog converter-based output stage : Appl. N 16/945520 : Filed 31.07.2020 : Pub. 29.06.2021 : / John L. Melanson, Johann G. Gaboriau, Lei Zhu, Wai-Shun Shum, Xiaofan Fei, Leyi Yin ; Assignee Cirrus Logic Inc ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US11050433/en?oq=US11050433.html (дата обращения: ДД.ММ.ГГГГ).