A 6 Watt linear RF power amplifier for WiMAX base station

This paper presents a two-stage design of a 6 watt RF linear power amplifier following WiMAX radio interface specification. The main design goal chosen is linearity instead of efficiency. By this reason the design must be complemented with a predistortion scheme. The main source of nonlinear impairment, i.e., 3rd-order intermodulation distortion product obtained is below -32 dBc, with a minimum ripple of 0.5 dB over a 150 MHz of bandwidth centered at 2.4 GHz. Due to the specified bandwidth, the DC decoupling filters and input-output matching networks are implemented mainly with microstrip components in both stages. A total gain of 27 dB was measured, which makes this amplifier able to be interconnected directly to low power baseband signal processors.

[1]  Mohammad Ilyas,et al.  WiMAX: Standards and Security , 2007 .

[2]  John Michael Golio.  The RF and Microwave Hanbook , 2001 .

[3]  Jose C. Pedro,et al.  Intermodulation Distortion in Microwave and Wireless Circuits , 2003 .

[4]  Savo Glisic.  Advanced Wireless Communications: 4G Technologies , 2004 .

[5]  T.H. Lee,et al.  Cartesian feedback for RF power amplifier linearization , 2004, Proceedings of the 2004 American Control Conference.

[6]  J. S. Kenney,et al.  DESIGN CONSIDERATIONS FOR MULTICARRIER CDMA BASE STATION POWER AMPLIFIERS , 1999 .

[7]  Stephen A. Maas,et al.  Nonlinear Microwave and RF Circuits , 2003 .

[8]  Mohammad Ilyas,et al.  WiMAX: Applications , 2007 .

[9]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[10]  W.R. Curtice,et al.  A new dynamic electro-thermal nonlinear model for silicon RF LDMOS FETs , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[11]  H. A. Atwater.  The design of the radial line stub : A useful microstrip circuit element , 1985 .

[12]  Andrew Wright.  Multi-Carrier WCDMA Basestation Design Considerations - Amplifier Linearization and Crest Factor Control Technology White Paper , 2002 .

[13]  Peter B. Kenington,et al.  High-Linearity RF Amplifier Design , 2000 .

[14]  Ramjee Prasad,et al.  Multicarrier techniques for 4G mobile communications , 2003 .

[15]  Thomas Eriksson,et al.  PAPR and other measures for OFDM systems with nonlinearity , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[16]  Savo Glisic.  Advanced Wireless Communications , 2004 .

[17]  Robert K. Crane,et al.  Propagation Handbook for Wireless Communication System Design , 2003 .

[18]  Norm Dye.  Radio frequency transistors , 1993 .

[19]  Steve C. Cripps,et al.  Advanced Techniques in RF Power Amplifier Design , 2002 .

[20]  Michael Murray. Elliott.  Single sideband transmission by envelope elimination and restoration. , 1953 .