From: tralad (ldean_at_metrowerks.com)
Date: 2001-12-05 04:31:25
I found the biosemi design Joerg's circuit is based on... blaming
temporary blindness :)
I have one comment/question, and I hope I am not displaying
overwhelming ignorance (wouldn't be the first time).
Joerg wrote:
8) IC3A, IC3B forms a 5-pole Sallen Key Butterworth Low Pass
with 75Hz cutoff frequency. (5th pole is on the digital board)
Now, I am wondering why the 5th pole should be on a separate
board? It seems that if the analog part of the circuit could all be
kept together, then it could hook to any microprocessor. This
would mean we could test just the analog board with our 6811s
which would significantly reduce development cost. Was it a lack
of space on the board, or is there some other reason? Would it
be possible to isolate all the analog circuitry to one board fo
increase modularity?
Laura
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