[sdiy] Filter stability and self oscillation

[Aaron Lanterman]

On Mon, 29 May 2006, Aaron Lanterman wrote:

> think about what the state variable is doing is imaging that you dumped the 
> feedback loop all together, and see what you would you get.

Clarification - dumped the _first_ feedback loop, the one from the BP 
output. You need the second feedback loop from the LP output or nothing 
interesting happens.

- Aaron

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