Limitations of spice modelling for PI designs?

[KingJL]

What are Tags? There is no entry for tags in LTSpice that I could find and no item in the Help file either.

See that symbol with the 'A' in it that is between Gnd and Resistor... try it.

[Qiaozhi]

Oh! Thanks!!
It works, but that is a bit kludgy (at least the way I did it [attached]). Is there an easier way??

Try this ->

[VinceC]

Try this ->

Thanks you! Thanks you! It is clear now. The like "labels" provide a virtual conductor.

One question - what is "VOUT"? Is that some special label?

Vince
.

[Qiaozhi]

Thanks you! Thanks you! It is clear now. The like "labels" provide a virtual conductor.

One question - what is "VOUT"? Is that some special label?

Vince
.

When you place a net name on the schematic, you can define the port type in the dialog box as "None", "Input", "Output" or "Bi-Direct". In the simple opamp example, the power connections are of type "None", and the opamp output is of type "Output". All that does is change the way it looks in the schematic. The underlying netlist is exactly the same for all port types.

To get the best from this software you should learn how to read a SPICE netlist. The netlist can viewed by selecting View > SPICE Netlist.

[VinceC]

When you place a net name on the schematic, you can define the port type in the dialog box as "None", "Input", "Output" or "Bi-Direct". In the simple opamp example, the power connections are of type "None", and the opamp output is of type "Output". All that does is change the way it looks in the schematic. The underlying netlist is exactly the same for all port types.

To get the best from this software you should learn how to read a SPICE netlist. The netlist can viewed by selecting View > SPICE Netlist.

There is OBVIOUSLY a lot for me to learn. I appreciate all of your help!