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Altera_Forum's avatar
Altera_Forum
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17 years ago

Stratix II: Coil circuit

I am trying to create a very close range wireless communication using stratix II fpga. I want to achieve that using coil - coil communication. So I connected coil1 to fpga1 with a series resi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

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Since the rate of change in current in the primary coil will produce voltage at the second coil, I think its clear that we need to use a resistance with low value in series with the coil. Isnt that true?

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The maximum I/O current and voltage of the FPGA have to be kept, this sets a lower limit to the series resistor. External transistors or drivers/power amplifiers should be used, if higher currents are needed.

As said, the highest output level will be achieved with a resonant circuits at both sides and no load at the secondary.