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here’s an example:
I have to disable these equations in order to start the p-param simulation.
The simulation calculates power waves a and b out of voltage probes. In ADS its called “wave probes”, as far as I know.
I second that.
Qucs-S can do that.
I would suggest adding an option “engineering notation” to all output thingies (tables, cartesian graph, markers on graphs etc. ), which is enabled per default.
The c++ code could read the arrays from a textfile, as done for touchstone.
@Michael: Is it possible to share the c++ code of the touchstone-file-component? I suppose its also written in the same c++ environment?
I created a small example. (see attached .qucs)
It contains only a resistor adjustable by a parameter. However, you should be able to extend it.
It is – however – tedious to initialize the array. Maybe its better to switch to C++. The verilog-A-Compiler creates a c++ file, that could be used as a starting point.
Cheers
CarstenEdit: I only read you post now. Seems you figured out already all the obstacles 🙂
Hi AntoC,
for S-param simulations, you would use a “power source”. That has 2 ‘pins’, so it is already differential. Or do you mean the S-param-Block for a touchstone file?
Cheers
Carsten
PS: are you working on an MRI RF coil?I also want to do something like that for the coilcraft aircore inductor series. What inductances are you trying to describe?
It should be relatively easy with a c++ or a verilogA model. There are templates in QS and examples on the website.
I also want to interpolate the descriptive values. That way the model could be more useful in a optimization task.
I found a paper for you here
Abstract: It is impossible to construct an ideal phase shifter, one whose phase shift
and gain is independent of frequency, using a linear circuit……Mmmh. My idea is that the solver cannot calculate the transient response. I assume, the solver works by calculating every time step after another based on the source signals and current currents/voltages.
Positive (or negative, not sure about the definition) phase shifts would be impossible, as the solver would need to predict the future.
What would be the response of a step function? The solver would need to transform the input into frequency domain, apply the phase shift and transform it back to time domain. My guess is that this does not comply with the time-step-by-time-step simulation procedure
it does the right thing in an AC simulation
I would guess, that it is not processed in a transient simulation, because an ideal shifter would not make sense here. But I would expect an error message in this case.
AC-Simulation: 90° phase shifter transforms Open condition on the right side to a short on the left side. thats why there should be voltage=0 at Pr1
