How to view operating point information for devices

Perl,

I am assuming that you are referring to TINA-TI.

The DC Analysis: Calculate operating point is actually DC Analysis --> Caclulate nodal voltages

DC analysis is only useful where a DC operating point would make sense. Running a DC analysis on a transient circuit provides little to no good information (unless you forgot where you set your supplies to start...). If the circuit is a DC circuit, then the table simply lists all of the nodal voltages and branch currents. You can also use the cursor to highlight the node that you are interested in and it will be highlighted in the list.

Britt

Thanks Britt,
Looks like it's back to LTspice :) One can simulate both circuits AND systems there..

Sometimes one does a transistor-level design and then wants to look at operating point info on a per-device basis.

Perl,

I understand.

LTSpice works the same way TINA-TI does with respect to a DC operating point or DC simulation. That is simply how a simulator works. A transistor level design is a DC, AC, and transient circuit. The IC models built into LTSpice and TINA-TI are NOT transistor level models and cannot be treated as such and will give you little to no useful information in a DC simulation.

If you have a transistor level design, any simulator will provide you the DC operating point of the circuit since that is how the matrix is initialized for solving the other analysis that you would run.

Britt

Thanks Britt. The main question is unanswered..

With LTspice, I can draw my own circuit with my own transistors (IC models for vendor parts are not part of the discussion) and view operating point info in the spice error log - designers are interested in gm, gds, VDSAT, etc.

Is that possible with TINA-TI? If yes, could you tell us how?

Thanks!