[sdiy] Designing 4-pole filters with identical 2-pole stages - why not?

[Donald Tillman]

> On Dec 18, 2015, at 6:02 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> Ok, so next question - does the order of the two sets of poles make any difference? Why do people put the higher-Q section second?

As far as the response goes, no difference.

There may be other electrical concerns, though.  High Q stages have gain, low Q sections just attenuate.  So if noise was a concern you'd want to have the high Q sections first and the low Q sections attenuate any noise after that.  

  -- Don

--
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com