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FSS Review

FSS Review. 18th August 2009. Opto-isolator: Top 4 frequency bits set by DIP switch FPGA controls bits 8-26. Tested without RF amplifier Signals fed into Spectrum Analyser. Changes whilst testing. Spectrum Analyser. No RF amp. DIP Switches.

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FSS Review

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  1. FSS Review 18th August 2009

  2. Opto-isolator: • Top 4 frequency bits set by DIP switch • FPGA controls bits 8-26

  3. Tested without RF amplifier Signals fed into Spectrum Analyser Changes whilst testing Spectrum Analyser No RF amp

  4. DIP Switches • Found on Opto-Isolator board with max. output 500 MHz • Control 4 most significant bits of output frequency; expect most significant is 250 MHz • Ended up getting frequency changes corresponding to TWICE expected frequency jumps!

  5. Gradient of 2.02735 with standard error <1% • In control of 1 GHz opto-isolator

  6. Opto-isolator schematic • Signal controlling frequency bit 24 is fed into first pin of opto-isolator and outputted via pin 14 • Fed to a particular output pin on 44-way connector

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