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Absolutely equivalent networks are simuated differently depending on the shunt connections.
For simulating a matching network I use temporary shunts. And very weird results are coming from simulations. See the image attached.
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usimmics does not support complex source impedances yet. Does the effect disappear if the source impedances are real?
Carsteen. For longer than 2 years it was told exactly contrary – it should support, though it is not well documented, since the latest QucksStudio.
I think there even was a discussion on this forum.
There are many badly documented things like Touchstone imedance conversion matrix…. which does not work correctly btw, while the devs claim it should do the thing.
Regardless of supported or not – the BUGREPORT is about different thing –
incorrect handling of the netlist
See the circuit – all the shunt network is the same node – zero impedance. It should not give different results regardless of connecting the middle point.
Carsteen, to be clear: Port complex impedance is supported. But the SMITH tool does not support arbitrary reference impedance (Zo), only 50Ω. So it should be renormalized manually. And I have no idea how to do that, if there is any function for that.
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A simplified example:
The inductor on the left is interpreted as being parallel to R1
The netlist generated for the left circuit alone seems ok:
R:R1 gnd _net0 “50 Ω” “26.85” “european” “SMD0603”
L:L1 _net0 _net0 “39 nH” “0” “” “inductor_1mH”
.SP:SP1 “lin” “0.01 GHz” “1.2 GHz” “100” “no” “1” “2” “none”
Pac:P4 _net0 gnd “1” “50 Ω” “0 dBm” “1 GHz” “26.85” “con_2”I don’t like that.
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