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SWP Reader Evolution

For this prototype I decided to stay with plain old through-hole packages and build the analog part in a modular way. The restriction to through-hole packages had a great influence of what parts I could use because most of the good stuff is in SMD these days. On the top I’ve used a XuLA-200 FPGA board. A really nice breakout for the Spartan 3A FPGA family. The analog part consists of (left to right): LT1227 current feedback OpAmp as the main SWP transceiver, good old LM311 as a one-bit A/D converter (to slow for high-speed SWP, but good enough up to 400 kbit/s). On the right there is a local power supply based around the LT1054 to generate the supply voltages for the OpAmp.”

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