UHF SSPA design for WCDMA space applications
Lockheed Martin Commercial Space Systems, Newtown, PA, 18940, USADOI: 10.1109/MILCOM.2007.4455203 Conference: Military Communications Conference, 2007. MILCOM 2007. IEEE
Source: IEEE Xplore
A new UHF Solid State Power Amplifier (SSPA) has been developed for a government mobile communications space program. The SSPA is capable of a peak power of 290 watts but will operate at a lower power of 135 Watts to provide the required linearity with WCDMA signals. Typical overall dc -RF efficiency is 42% at this operating point. The SSPA consists of an Input Amplifier with Command and Telemetry Electronics, a High Power Amplifier (HPA) section and an Electronic Power Converter (EPC). This paper begins by discussing the overall Satellite System Architecture, followed by details of the SSPA design and results from testing the Engineering Development Unit (EDU)
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Conference Paper: A linear GaN UHF SSPA with record high efficiency[Show abstract] [Hide abstract]
ABSTRACT: This paper discusses a highly efficient linear UHF solid state power amplifier (SSPA) developed for avionics and space applications. Predistortion linearization combined with high-voltage gallium nitride (GaN) FET technology allows the simultaneous achievement of both linearity and record high linear efficiency (70%). This amplifier will produce over 100 W of linear output power as well as a power added efficiency (PAE) at saturation approaching 90 percent. This paper describes the power amplifier design approach and presents measured test data.
Conference Paper: UHF GaN SSPA for space applications[Show abstract] [Hide abstract]
ABSTRACT: A new UHF Solid State Power Amplifier (SSPA) has been developed for use in government mobile communications space programs. Predistortion linearization combined with high-voltage gallium nitride (GaN) FET technology allows the simultaneous achievement of both linearity and record high linear efficiency. This SSPA is capable of a peak power of more than 170 watts, but will be operated at a lower power (60 watts) to provide the reliability required for service in space and the linearity needed for WCDMA operation. A power added efficiency (PAE) of greater than 60% was achieved at this operating point.
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