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sinara-hw / Kasli

Kasli is a powerful FPGA carrier, capable of controlling 12 Eurocard extension modules.
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SMA clock in isolation #50

Closed hartytp closed 4 years ago

hartytp commented 5 years ago

Question: what's the current thinking on isolating the SMA clock in? IIRC we agreed that using capacitors to float grounds was a bad idea, but how do we feel about isolation transformers?

I ask because the clock in SMA currently goes through a DC isolating transformer, which we're not actually using as such.

What about connecting the input ground of TR1 to the input SMA ground rather than the circuit ground and removing the capacitors that tie the SMA and circuit ground together? We can keep the 0R jumper populated by default so that the two grounds are tied together by default, but this would give the users an easy path (by removing the 0R resistors) to isolate the grounds galvanically.

Thoughts? @jordens

jordens commented 5 years ago

Yes. That sounds good to me with the 0r populated.