Subsystems and Systems

RSS

The SKY65336 and SKY65337 ZigBee front-end modules (FEMs) can greatly enhance the performance of a ZigBee radio solution when integrated with any ZigBee low power reference design. Both devices can transmit up to 100 times more power than a typical 0 dBm low power ZigBee radio transmitter and can reduce the level of unwanted spurious emissions to be compliant with the main regulatory standards without the use of external components such as filters. Ember’s EM250 with Skyworks’ FEM reference design [1] shows a good example of the complete subsystem.

A Mobile Satellite Communications (MSC) system is radio-relay station temporarily located at determined position in space (approximately between 20 and 36,000 km) to receive RF signals from different Mobile Earth Stations (MES), amplify the signals and transmit them back to Land Earth Stations (LES), which are connected to the ground telecommunication infrastructure. To provide those all functions in order satellite has to be equipped with adequate subsystems integrated by payload and bus. The payload is usually located inside of satellite body, which contains the transponder or transceiver system (satellite receivers and transmitters). The transponder is also connected to the receiving and transmitting antenna system, which are mounted outside on the satellite body. Therefore, each satellite must be stabilized in its orbital slot, which has to counteract the forces acting on the satellite motion and to keep the antennas of a satellite constantly pointing to a specific footprint of the Earth.