Continuous Mode Power Amplifier Design Using Harmonic Clipping Contours: Theory and Practice

A novel graphical power amplifier (PA) design tool, the “clipping contour,” is introduced and described. Using the now well-publicized continuous Class-B/J voltage waveform formulation as a starting point, a process is derived that allows contours to be constructed on a Smith chart that define the “zero-grazing” fundamental and harmonic impedance conditions. Theoretical equations are defined and solved whereby the contours can be drawn in real time in a computer-added design environment. A key and novel result from this theory is the definition of a 2-D harmonic design space that opens up rapidly as small concessions from optimum power and efficiency matching conditions are made. A design example is described and fabricated, which demonstrates the utility of using the second harmonic clipping contour during the PA design process. A 10-W GaN demonstrator gives measured continuous wave power > 8.5 W, efficiency > 60%, and better than -30-dB adjacent channel power ratio over a bandwidth of 1-2.9 GHz.

[1]  C. E. Weitzel.  RF POWER AMPLIFERS FOR WIRELESS COMMUNICATIONS , 2002 .

[2]  J. Lees,et al.  On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers , 2009, IEEE Microwave and Wireless Components Letters.

[3]  Frederick H. Raab,et al.  Idealized operation of the class E tuned power amplifier , 1977 .

[4]  P.M. White.  Effect of input harmonic terminations on high efficiency class-B and class-F operation of PHEMT devices , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[5]  Jangheon Kim,et al.  Saturated Power Amplifier Optimized for Efficiency Using Self-Generated Harmonic Current and Voltage , 2011, IEEE Transactions on Microwave Theory and Techniques.

[6]  Steve C. Cripps.  Grazing Zero [Microwave Bytes] , 2010 .

[7]  A. L. Clarke,et al.  The Continuous Class-F Mode Power Amplifier , 2010, The 5th European Microwave Integrated Circuits Conference.

[8]  D. M. Snider,et al.  A theoretical analysis and experimental confirmation of the optimally loaded and overdriven RF power amplifier , 1967 .

[9]  F. Raab.  Class-F power amplifiers with maximally flat waveforms , 1997 .

[10]  No Sokal,et al.  CLASS-E - NEW CLASS OF HIGH-EFFICIENCY TUNED SINGLE-ENDED SWITCHING POWER AMPLIFIERS , 1975 .

[11]  David R. Cox,et al.  Linear Amplification with Nonlinear Components , 1974, IEEE Trans. Commun..

[12]  H. Chireix.  High Power Outphasing Modulation , 1935, Proceedings of the Institute of Radio Engineers.

[13]  Georg Boeck,et al.  Investigation of class-B/J continuous modes in broadband GaN power amplifiers , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[14]  A. L. Clarke,et al.  On the Extension of the Continuous Class-F Mode Power Amplifier , 2011, IEEE Transactions on Microwave Theory and Techniques.

[15]  Kenle Chen.  Design of Broadband Highly Efficient Harmonic-Tuned Power Amplifier Using In-Band Continuous Class (-1 ) / F Mode Transferring , 2016 .

[16]  J. D. Rhodes.  Output universality in maximum efficiency linear power amplifiers , 2003, Int. J. Circuit Theory Appl..

[17]  A. Darwish,et al.  Recent implementations of Class-E power amplifiers , 2012, 2012 Japan-Egypt Conference on Electronics, Communications and Computers.

[18]  J. Benedikt,et al.  GaAs X-band high efficiency (>65%) Broadband (>30%) amplifier MMIC based on the Class B to Class J continuum , 2011, 2011 IEEE MTT-S International Microwave Symposium.

[19]  Franco Giannini,et al.  High Efficiency RF and Microwave Solid State Power Amplifiers , 2009 .

[20]  A. Mediano,et al.  High-Efficiency Broadband Parallel-Circuit Class E RF Power Amplifier With Reactance-Compensation Technique , 2008, IEEE Transactions on Microwave Theory and Techniques.

[21]  S.C. Cripps,et al.  A Theory for the Prediction of GaAs FET Load-Pull Power Contours , 1983, 1983 IEEE MTT-S International Microwave Symposium Digest.

[22]  F. Giannini,et al.  A Complete Class of Harmonic Matching Networks: Synthesis and Application , 2009, IEEE Transactions on Microwave Theory and Techniques.

[23]  David D. Wentzloff,et al.  IEEE Transactions on Microwave Theory and Techniques and Antennas and Propagation Announce a Joint Special Issue on Ultra-Wideband (UWB) Technology , 2010 .

[24]  Steve Cripps,et al.  Load Pull verification of a novel Class B/J design tool: Second harmonic clipping contours , 2013, 81st ARFTG Microwave Measurement Conference.

[25]  Dristy Rahul Parveg,et al.  A broadband, efficient, overdriven class-J RF power amplifier for burst mode operation , 2010, The 40th European Microwave Conference.

[26]  J.K.A. Everard,et al.  Broadband power efficient class E amplifiers with a non-linear CAD model of the active MOS device , 1987 .

[27]  D. Peroulis,et al.  Design of Broadband Highly Efficient Harmonic-Tuned Power Amplifier Using In-Band Continuous Class- ${\hbox{F}}^{-1}/{\hbox{F}}$ Mode Transferring , 2012, IEEE Transactions on Microwave Theory and Techniques.

[28]  P. J. Tasker,et al.  Novel wide band high-efficiency active harmonic injection power amplifier concept , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[29]  Viktor Krozer,et al.  Power Amplifier Technology at Microwave and Millimeter-Wave Frequencies: an Overview , 2008 .

[30]  P.J. Tasker.  Practical waveform engineering , 2009, IEEE Microwave Magazine.

[31]  W.H. Doherty,et al.  A New High Efficiency Power Amplifier for Modulated Waves , 1936, Proceedings of the Institute of Radio Engineers.

[32]  Dimitrios Peroulis,et al.  Design of broadband high-efficiency power amplifier using in-band Class-F−1/F mode-transferring technique , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.

[33]  Corinne Berland,et al.  Linearity considerations for multi-standard cellular base station transmitters , 2011, 2011 41st European Microwave Conference.

[34]  J. Lees,et al.  A Methodology for Realizing High Efficiency Class-J in a Linear and Broadband PA , 2009, IEEE Transactions on Microwave Theory and Techniques.

[35]  G. Verzellesi,et al.  Reliability of GaN High-Electron-Mobility Transistors: State of the Art and Perspectives , 2008, IEEE Transactions on Device and Materials Reliability.