[sdiy] Spice model for CA3080 OTA

[Pete Hartman]

Quick update:

While I haven't solved the PCBs yet, I have built a CA3080 test
circuit (the unity gain follower from the datasheets) and proven that
the ones that were on the PCBs are good.

I also proved that the 25 I bought in 2012 are all crap. :(  So that
is a leading candidate for what was wrong with the breadboard version.

Thanks

Pete


On Wed, Oct 16, 2013 at 9:28 AM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Hi Richie,
>
>> If the output of the filter sometimes mutes and sticks to one of the rails,
>> I'd hazzard a guess that there might be an op-amp in there somewhere who's
>> output undergoes phase-reversal when one of the inputs goes outside the
>> normal operating range.
>
> You could well be right.  The CA3080 datasheet does not say it does
> not go into phase reversal (gotta love those double-negatives!) so it
> could be the CA3080.  The datasheet for the OPA134 clearly states that
> it does NOT suffer phase reversal.
>
> Neil
> --
> http://www.njohnson.co.uk
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