[sdiy] CS80 Filter IC schematic

[Antti Huovilainen]

On Mon, 24 Jan 2005, The Old Crow wrote:

>  I used standard OTAs to make the gain cells in my CS80 filter
> equivalent.  CA3280s, to be exact.  Ideally, you need to match the OTAs in
> sets of 3 for best performance, e.g., the same Iabc for each OTA yields
> the same fraction of gain.  You want as much Iabc vs. input signal as
> possible for minimum noise, thus the use of 3280s.

How does CA3280 differ from CA3080 besides better offset spec?
Also, should linearizing diodes be used?

Antti

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