Hello Expert In the AMI simulation, the impedance of tranceiver is modeled as a ideal 50 ohm resistor(pair) and package model. i am thinking that the assumed ideal 50ohm is valid for the frequency of interest? Also there will be impedance imbalance between P and N pin. is possible to measure the output impedance using VNA? Can someone give some link on output impedance of a tranceiver? Best Regards. Tesla------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu