New output network design approach for voltage-mode class-S PAs

This paper presents a new approach for realizing the output network of class-S power amplifiers in the 900MHz band. The idea is to use bond-wires instead of lumped inductors thus improving Q factor and broadband impedance termination at the output of the switching stage. A filter made of bond-wires and planar capacitor was designed and fabricated. Measurements were also performed in a class-S PA module and compared to the convention. Measurements of the proposed network were performed and compared with filter solution using SMD elements.

[1]  W. Heinrich,et al.  Switch-mode amplifier ICs with over 90% efficiency for Class-S PAs using GaAs-HBTs and GaN-HEMTs , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[2]  O. Ambacher,et al.  Broadband GaN-Based Switch-Mode Core MMICs with 20 W Output Power Operating at UHF , 2011, 2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS).

[3]  P. Asbeck,et al.  Bandpass delta-sigma class-S amplifier , 2000 .

[4]  R. Leberer,et al.  Advances on GaN based switch mode amplifiers for communication applications , 2011, 2011 41st European Microwave Conference.

[5]  R. Leberer,et al.  An AlGaN/GaN class-S amplifier for RF-communication signals , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[6]  Andreas Wentzel,et al.  A voltage-mode class-s power amplifier for the 450MHz band , 2010, The 40th European Microwave Conference.

[7]  W. Heinrich,et al.  A 900 MHz voltage-mode class-S power amplifier , 2012, 2012 The 7th German Microwave Conference.

[8]  M. Kozak.  Oversampled Delta-Sigma Modulators: Analysis, Applications and Novel Topologies , 2003 .

[9]  Frederick H. Raab,et al.  Solid State Radio Engineering , 1980 .

[10]  John Wood,et al.  Modeling and Characterization of RF and Microwave Power FETs , 2007 .