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On Sun, Oct 22, 2017 at 7:33 PM, Richard Wilbur richard.wilbur@gmail.com wrote:
I'll try to get some computer time today and markup a picture with some ideas for the taper and geometry towards the connector end and send it to the list.
thx richard.
By the way, the Analog Devices employee's recommendations can't be exactly normative with my understanding of transmission line impedances-- differential impedance < 2 * single-ended impedance. (In other words you'll want single-ended > 50Ω if you hope to get differential = 100Ω.)
that makes a kind of sense
I'd consider them design guidelines or goals in order to try and keep the process from going in the ditch.
well... in theory it might be possible to change the layer stack slightly (move layer 5 a bit further away from layer 1), or go to 4mil track widths (but preferably *without* moving any of the traces!)
the layer stack height alteration is an easy one to do.
track width changes... yyeah... 4 mil would be the thinnest tracks on the entire board, i'm reluctant to do it but we can do it if necessary.
l.