> On Sep 21, 2016, at 11:33 AM, Matt Murphy <[email protected]> wrote: > > In terms of the phase shift introduced by filters, I assume the distortion > introduced by the filter is commensurate with the steepness of the skirts?
When designing an analog filter, you can optimize the amplitude response (Chebyshev or Elliptic) or the phase response (Bessel), or a compromise (Butterworth). Digital filters can optimize both the amplitude and phase response (FIR), but they add delay in the time domain. Once again, no free lunch in physics. The textbook for my analog filter class was “Analog Filter Design” by M. E. Van Valkenburg. Filters are designed by computer now, but the math should be pretty much the same. http://dea.unsj.edu.ar/sredes/Biblioauxi/260360960-Analogue-Filter-Design.pdf <http://dea.unsj.edu.ar/sredes/Biblioauxi/260360960-Analogue-Filter-Design.pdf> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
