[sdiy] OTA performance (was SSM chip reissue)

[Tom Wiltshire]

On 27 Apr 2017, at 22:28, Neil Johnson <neil.johnson71 at gmail.com> wrote:

> Tom,
> 
>> There are three potential causes we've identified:
>> 
>> 1) Phase lag
> 
> No, that causes Q enhancement at the upper end of the frequency range
> as the cutoff frequency approaches the dominant pole of the
> op-amps/OTAs and the excess phase (lag) accumulates around the loop.

Ok, strictly "less likely to resonate at lower frequencies" (what I said) isn't the same as "more likely to resonate at high frequencies" (what you said), but it amounts to much the same thing for practical purposes.

The problem is all of these effects point in the same direction, and we don't know which of them is the most important.

Tom