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Author Topic: Frequency to voltage converter IC  (Read 1985 times)
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Columbus, Ohio USA
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Very interesting, Mag--thanks for sharing what you've done.

BTW, for the anti-aliasing filter, I like the tools on this web site from Japan:

http://sim.okawa-denshi.jp/en/Fkeisan.htm

For example, the third-order Sallen-Key LPF which you can implement with 3 resistors, 3 caps and an op amp. Using the Chebyshev selection, looks like if you set the cutoff at 2KHz you could be almost 30dB down at 4KHz.

Joe

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I'm afraid the filter that I need, isn't invented yet.   Roll off so sharp : 30 dB from 1976 to 2000 Hz........
(Nyquist with 4k sampling is 2kHz).  What it would be , 30-th order or something?
The other way, push sampling to higher rate, again , with more memory.
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