[sdiy] SSM2164 Filter Cells

[Aaron Lanterman]

On Jul 21, 2009, at 10:40 PM, Scott Nordlund wrote:

>
>> So far I've only seen integrator based filters for the 2164,  
>> nothing like
>> the regular OTAs (cap between OTA output and output current amp).  
>> Anyone
>> know why this is, are there issues with 2164 in this configuration?
>
> I may be missing something here but I don't know of any OTA-based  
> VCF that isn't made using integrators.  Do you have an example?


I guess the Sallen-Key with OTA is an example (MS-20 style, for  
example)- it's hard to find a specific spot and say "oh that's an  
integrator," particularly with the feedback cap.

With SVFs or the four-pole-with-feedback-types its easy to arrange  
things to see an integrator structure.

- Aaron