On Thu, Oct 12, 2017 at 9:16 PM, Richard Wilbur <[email protected]> wrote:
>> whoops.... :) 89 ohm... 50 ohm. 89 ohm... 50 ohm. oops... :) > > Well, if the reported impedance is the single-ended impedance > of those lines we have considerable margin to burn and should > aggressively pursue the taper structure and bring in the keepouts at each end. i sort-of understand that. am i right in thinking: at the ends we have to treat them as single-ended, and achieve a sngle-ended impedance of 50 ohms, but 100 ohms for the diff-pairs. > For the geometry that fit our constraints, we calculated a single-ended > impedance of ~72 Ohm and differential impedance of ~111 Ohm (which > corresponds to a tolerance of 11%). ok so 72's not really very close to 50 ohms... interested to learn how that can be achieved. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
