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Page 38
4.5 MultiBand-C Europe Board.
Overview:
The MultiBand board plugged upstream the Tuner board, allows converting a signal of a
particular RF band to S band.
Description:
The MultiBand board has 2 independent RF channels, based on a generic architecture.
An internal switch systems allows to transmit the RF signal directly to the output or to convert this
signal to IF band (2180-2485MHz) with a direct mixing.
The C Europe-Band version is a down frequency conversion (5090-5250 to 2250-2410MHz). The RF
bandwidth is delimited by a ceramic filter, the mixing being provide by a fixed LO, and the global gain is
near 0dB.
The synthesizer is designed around a typical low phase noise Integer-N PLL architecture to a fixed
frequency.
The FPGA is used as an interface to the PCI express bus and makes easier the control of the board in
the RTR system. The main functions are OL programming, reading and writing data in flash memory
and switching between the two RF channels.
