tkhan wrote on Aug 9th, 2008, 9:45pm:ok i have done some reading from cascade application notes,
You mean "Cascade Microtech Inc" ?
tkhan wrote on Aug 9th, 2008, 9:45pm:1. to test a differential, centre tapped inductor w/ PGS, is this a correct probe configuration?
I don't know what you mean by "PGS".
If you have two "GS" probes and one "GSG" probe, it is correct configuration.
But Probe configulation is dependent on what probes you have.
http://www.cmicro.com/go/engineering-products-division/product-portfolio/probes/...For example, "GSG" probe is for center tapped pin and "GSGSG" probe is for other pins of inductor.
Quote:2. why are the input terminals both single ports and not differential? it seems this way, both ports have same polarity.
You don't seem to understand S-parameter.
Again you should read text book on microwave engineering basic.
Quote:3. the ground ports should be referenced to a port that is on the same reference plane as itself. then all the signals should be applied to same layer as ground and ground should be associated with signal?
I can't understand what you mean.
Quote:4. in general, how are the ports configured using ads momentum? in cadence spectre, it was possible to define the parameters of the port such as excitation signal, frequency, amplitude, etc. in ads i can only change the type of port (single, internal, differential, coplanar, ground reference).
I can't understand what you mean.
If you want to drive differetially, excecute AC analysis not SP analysis.
But even though you excecute SP analysis, you can derive any mode S-parameter.
Again you should read text book on microwave engineering basic.
Quote:5. my understanding of 'port' and 'probe' is a bit off i think. for example, GSG probe configuration. each G/S/G is referred to as 'probe' and 'port' is the entire GSG configuration?
You can consider like the above.