Your post is usage of simulator not Design issue.
Please post to "The Designer's Guide Community Forum ≫ Simulators ≫ Circuit Simulators".
kevinvinv wrote on Jan 7th, 2009, 8:16am:This is not how things are looking actually... and it is puzzling to me.
I guess I have never looked at tline behavior before at DC but now I need too...
You are misunderstanding tline. tline is not differential line(coupled line).
See "spectre -h tline".
Quote:Only the odd mode is modeled, so only the voltage difference across each port is important.
(The absolute voltage of each terminal is not significant.)
Also, the current into one node of a port exactly equals the current leaving the other node of the port.
Also see Chapter-7 of the following.
http://cp.literature.agilent.com/litweb/pdf/ads2005a/pdf/ccdist.pdf"TLIN4 (Ideal 4-Terminal Transmission Line)" is most close to "tline of Cadence Spectre".
Here Pins 2 and 4 need to be appropriately grounded for correct usage of this component.
In your case, nodes "c" and "d" need to be grounded.
"tline of Cadence Spectre" is not coupled line such as "CLIN (Ideal Coupled Transmission Lines)".
Attached is a extraction from HSPICE manual.
In your case, "a"->"in", "b"->"out", "c"->"refin", "d"->"refout".