[sdiy] Analysing 4-stage RC filters without the hot air

Andrew Simper andy at cytomic.com
Sun Apr 3 04:57:29 CEST 2016

Hi Neil,

Thanks very much for taking the time to post about this, very useful!
I've seen these 2-port (and n-port) matrix definitions before but not
really had time to explore them further, your page has made it all
much more accessible for me, much appreciated.



On 22 March 2016 at 05:07, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Hi all,
> Some of you may remember a thread a little while back about a 4-stage
> passive RC filter (I think it was Tom who asked the original
> question), and ABCD matrices came up in the conversation.  I've
> written up a page on the theory behind them and how they can be used
> to analyse and design passive circuits:
> http://www.milton.arachsys.com/nj71/index.php?menu=2&submenu=2&subsubmenu=14
> As a worked example I used a 4-stage RC filter from Electronotes where
> I show that actually it's not that difficult at all to analyse the
> unbuffered 4-stage RC filter contrary to Bernie's protestations.
> Comments welcome!
> Neil
> --
> http://www.njohnson.co.uk
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