Title :
Efficiency of Current-Mode Class-D Amplifiers with Delta-Sigma Modulated Drive Signals
Author :
Bräckle, A. ; Heck, S. ; Berroth, M. ; Dettmann, I.
Author_Institution :
Inst. of Electr. & Opt. Commun. Eng., Univ. Stuttgart, Stuttgart
Abstract :
This paper describes the losses and efficiency deteriorations due to several non-idealities of a current-mode class-D amplifier driven by a Delta-Sigma 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%.
Keywords :
current-mode circuits; delta-sigma modulation; power amplifiers; radiofrequency amplifiers; current-mode class-D amplifiers; delta-sigma modulated drive signals; frequency 30 MHz; radio frequency power amplifiers; Circuits; Delta modulation; Optical amplifiers; Power generation; Pulse amplifiers; Pulse measurements; Pulse modulation; Radio frequency; Radiofrequency amplifiers; Semiconductor optical amplifiers; class-S amplifier; current-mode class-D amplifier; drain efficiency;
Conference_Titel :
Microwave Conference, 2009 German
Conference_Location :
Munich
Print_ISBN :
978-3-9812668-0-1
Electronic_ISBN :
978-3-8007-3150-3
DOI :
10.1109/GEMIC.2009.4815901
