The final stage of the transponder includes a power amplifier
such as a TWTA or a transistor SSPA . SSPAs (SSPAs) are tending to replace
TWTAs for low-to-medium power requirements due to their better linearity
and lower power requirements. The amount of power available for
amplification is limited by the power-generation capability of the satellite
platform. TWTAs provide output powers of several hundred watts with
efficiencies of up to 40-50% with a gain of approximately
55 dB. SSPAs provide output powers of 10-30W
with efficiencies of 20-35% with gains of approximately 50 dB.
Other topics in our resources on Satellite Communications related to SSPA include: