[sdiy] Ladder filters and gain drop, that old chestnut

mskala at ansuz.sooke.bc.ca mskala at ansuz.sooke.bc.ca
Mon Aug 31 06:05:49 CEST 2015


On Mon, 31 Aug 2015, Andrew Simper wrote:
> And a point to note is the half power point is not -3 dB exactly, as
> dB isn't exactly related to powers of 2:
>
> 20*log(10, sqrt(1/2)) ~= -3.0102
>
> where ~= means approximately equal to.

Are your filters built with components accurate enough, and
temperature-stable enough, for a difference of 0.01dB in the response
curves to be meaningful?

-- 
Matthew Skala
mskala at ansuz.sooke.bc.ca                 People before principles.
http://ansuz.sooke.bc.ca/



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