[sdiy] 4 Pole state-variable filters

[markus]

i don't have access to EN, and i have searched the web many times to learn 
about phase compensation in filter circuits. can someone please point me to 
some resources as to how this is done ?

also, what are the differences between using OTAs vs. regular opamps in a 
SV filter design ?

TIA
mark



At 04:08 PM 2/11/02 -0700, you wrote:
>In EN Special Issue F, page 47 (1986) Bernie did a fairly detailed 
>examination of how to compensate op-amp phase shifts. This might help in 
>improving performance of higher-order filters with feedback. Simple RC 
>compensation certainly helped a lot in improving the 4-pole LP with feedback.
>
>   Ian
>
>
>
>At 09:38 AM 2/11/2002, Grant Richter wrote:
>> > Bit of a disappointment as I expected a genius solution for the
>> > problematic feedback behavior from the mythical EN.
>>
>>A fair number of the people who contributed to Electronotes are now here on
>>this list. Electronotes was written and published by enthusiasts, not
>>genius's (although some things got close ;^)