Transmission line: too many parameters.
982 0
example 7 years ago
**BUG** Concise problem statement: The lossless transmission line does not run in EE. This explains why. The ngspice lossless transmission line allows the user to specify **either** Z0 and TD **or** Z0, F and NL. The EE transmission line specifies Z0, TD **and** F. The EE default value for F is 1. Deleting this *value* removes F from the list of Custom Attributes in the Properties panel *but* leaves: `F=` at the end of the parameters list for each instance of a T in the netlist. The netlist then fails to parse correctly so the simulation fails to start (with no clear error message to the user). Running the netlist in but with the `F=` parameter for each T instance deleted or commented out, the sim runs OK: How to fix this. **************** The simple way is to remove the F parameter and just have Z0 and TD as the only available parameters however for people doing RF design, the F and NL option may be more helpful. Maybe access the two options from a dropdown menu in the symbol in left hand panel (like the symbol choices for US/EU for some components)? For info: ********* From ngspice manual Chapter 6: Transmission Lines. ________________ Z0 is the characteristic impedance. The length of the line may be expressed in either of two forms. The transmission delay, TD, may be specified directly (as TD=10ns, for example). Alternatively, a frequency, F, may be given, together with NL, the normalized electrical length of the transmission line with respect to the wavelength in the line at the frequency, F. F is specified in Hz. If a frequency, F, is specified but NL is omitted, an NL value of 0.25 is assumed (that is, the frequency is assumed to be the quarter-wave frequency). Note that although both forms for expressing the line length are indicated as optional, one of the two must be specified. Url: Browser:Mozilla/5.0 (Windows NT 5.1; rv:25.0) Gecko/20100101 Firefox/25.0
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