Thermal considerations in the use of solid state power amplifiers on the GOES spacecraftThe use of solid state power amplifiers (SSPA) in satellites has been quite prevalent in several frequency bands. This trend is evidenced by the use of SSPAs at Hughes in the UHF band (Leasat/Syncom IV), S band (GOES), C band (Telstar), and SHF band. The junction temperature of the transistor is the driving requirement which determines the lifetime of the transistor, SSPA, and the payload. This temperature is determined by the transistor characteristics, use of the device, and mounting temperature of the SSPA. The temperature of the spacecraft in the area of the SSPA can be controlled by active or passive means. The various factors and interrelationships used to calculate and control the temperatures of SSPAs are described. The thermal design and calculation of junction temperatures are exemplified with the Geostationary Operational Environmental Satellite spacecraft.
Document ID
19840054697
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mallette, L. (Hughes Aircraft Co. Los Angeles, CA, United States)
Darby, S. (Hughes Aircraft Co. Los Angeles, CA, United States)
Baatz, M. (Hughes Aircraft Co. Los Angeles, CA, United States)
Ujihara, K. (Hughes Aircraft Co., Space and Communications Group, Los Angeles CA, United States)