Perry, the most likely cause of your "noise" is an inadvertent sneak path to node 0 on the daughter card side of the connector. This can sometimes be burried deep within a vendors spice model. I suggest that you systematically remove all elements on the daughter card side of the connector, and gradually add each one until the culprit is found. best regards and good luck, scott ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu