--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Sun, Oct 22, 2017 at 7:33 PM, Richard Wilbur <[email protected]> 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. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
