Re: How to simulate temperature coef of a circuit and measure voltage across a circuit
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Alan wrote:
? ?"I read through the help and learn how to click and drag the voltage probe to read the voltage across a circuit. But I cannot do that in DC operating point simulation. Any way to read DC across the circuit?"
That's where the .MEASURE statement comes in handy.
Like other "dot commands", they are added to the schematic using that ".op" icon on the far right of the toolbar.
The .MEASURE statement is very powerful, but I rarely used it myself so my experience is limited.? I think you would use something like this:
.measure ?op ?pick_any_name ?param V(a)-V(b) or .measure ?op ?pick_any_name ?param V(a,b)
where a and b are the net names you actually assigned to those nets.? Then look in the .log file to see the result.? Right-click on the schematic and choose View -> SPICE Error log.? The "Error log" is an unfortunate name for the text output of the SPICE simulation.? That's where the results of any .MEASURE statements goes.
You only need to do that when you are doing just an .OP analysis.??That's because the .OP analysis has nothing to graph.??If you use .TRAN or .DC or even .STEP TEMP (with .OP), you will be able to drag the mouse pointer between the nets to get their difference.
Andy
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