Optimized Output Baluns for Current Mode Class D Power Amplifiers

Conference: GeMiC 2014 - German Microwave Conference
03/10/2014 - 03/12/2014 at Aachen, Germany

Proceedings: ITG-Fb. 246: GeMiC 2014

Pages: 4Language: englishTyp: PDF

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Kamper, Michael; Fischer, Georg (University of Erlangen-Nuremberg, Erlangen, Germany)
Kamper, Michael; Kondakov, Dmitrii (Fraunhofer Institute for Integrated Circuits IIS, Erlangen, Germany)
Kondakov, Dmitrii (St. Petersburg State Polytechnical University, St. Petersburg, Russia)

Baluns optimized for Current Mode Class D (CMCD) amplifiers are presented. CMCD amplifiers employ a differential output and therefore require a low loss balun to drive single ended loads. Furthermore, impedance termination at harmonic frequencies needs to be controlled to maintain high efficiency operation. In this work planar balun types are compared with respect to insertion loss and harmonic impedance behavior. Afterwards an exponentially tapered balun is designed, demonstrating a very low loss of 0.2 dB at 860 MHz.