Challenges in 100W CW UHF SSPA for communication payloads

A 100W CW UHF band SSPA has been developed and qualified for communication payloads in geostationary satellites. The design is based MOSFET devices in push-pull configuration. The Solid State Power amplifier (SSPA) is capable of operating in multi-carrier operation with 3rd Order Inter-Modulation Distortion (IMD) better than 21dBc. The SSPA provides 100W output power with DC power consumption of 320 watts. The design is a four module approach with High power Amplifier designed as balanced amplifier configuration and operating at 54% Power Added Efficiency. A high efficiency 400W Electronic Power Conditioner (EPC) has also been designed and qualified for the SSPA.

[1]  Allen Katz,et al.  UHF SSPA Design for WCDMA Space Applications , 2007, MILCOM 2007 - IEEE Military Communications Conference.

[2]  R. Zuleeg,et al.  Radiation effects in GaAs FET devices , 1989, Proc. IEEE.

[3]  Brian Eggleston,et al.  UHF GaN SSPA for space applications , 2010, 2010 IEEE Radio and Wireless Symposium (RWS).

[4]  T. R. Weatherford,et al.  Historical perspective on radiation effects in III-V devices , 2003 .

[5]  Sammy Kayali.  Compound Semiconductor Devices for Space Applications , 2000 .

[6]  A. Katz,et al.  A Highly Efficient UHF Power Amplifier Using GaAs FETs for Space Applications , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[7]  Brian Eggleston,et al.  A linear GaN UHF SSPA with record high efficiency , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.