How do I measure the characteristics of a voltage divider in a QUCS simulation?

Question

How do I measure the characteristics of a voltage divider in QUCS?

Below is what I have tried thus far, using Qucs 0.0.15 on Ubuntu 10.04

I want to measure how the voltage at the center of a voltage divider changes based on R2 in the schematic below. I am attempting to simulate this in QUCS using a DC simulation and a parameter sweep.

This is how I have it set up below, but the output is constant from what I can tell, which does not make sense.

schematic

graph setup tabular output

score 4 · Accepted Answer · answered Mar 15 '13 at 04:51

4

Like SPICE simulators there's a difference between simulation parameters and reference designators.

Here, the reference designator for the lower resistor is R2. The R value of R2 is always 50 ohms. To use a parameter, you must assign it to the parameter name surrounded by curly braces. So the R value of resistor R2 should be {R2} to have resistor R2's R value set to the parameter R2.

To make things a bit more clear, change the parameter sweep param to RLOW and the value of R2 to {RLOW}. The simulation should work as expected and you'll get the correct results (yeah, I realize that my voltage source isn't at the same level as the OP so the actual values will be different).

schematic

results

answered Mar 15 '13 at 04:51

helloworld922

16,600
10
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Bless you! That worked wonderfully. – JonnyRo Mar 15 '13 at 05:49
Stack exchange is the coolest system out there! – JonnyRo Mar 15 '13 at 05:50
I don't think you need the curly brackets in QUCS – endolith Aug 28 '15 at 19:04

How do I measure the characteristics of a voltage divider in a QUCS simulation?

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