Efficiency of Current-Mode Class-D Amplifiers with Δ-Σ Modulated Drive Signals

Konferenz: GeMiC 2009 - German Microwave Conference
16.03.2009 - 18.03.2009 in München, Germany

Tagungsband: GeMiC 2009

Seiten: 4Sprache: EnglischTyp: PDF

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Bräckle, A.; Heck, S.; Berroth, M. (Institute of Electrical and Optical Communications Engineering, Universität Stuttgart, 70569 Stuttgart, Germany)
Dettmann, I. (Rohde & Schwarz GmbH, 81671 München, Germany)

This paper describes the losses and efficiency deteriorations due to several non-idealities of a current-mode class-D amplifier driven by a Δ-Σ pulse sequence. The computation of the total efficiency of the amplifier is presented. Finally the results are verified by designing and measuring an amplifier driven by a pulse sequence with 50 % duty cycle and a frequency of 30 MHz. The measured efficiency of 55.6 % fits the calculated value of 58.3 %.