Re: [Qucs-help] controlled resistor element?

 Re: [Qucs-help] controlled resistor element? From: Stefan Jahn - 2009-12-14 14:50:39 ```Am Di, 1.12.2009, 00:01 schrieb Richard Finstad: > Stefan. Hello Richard, > Thank you! As I stated > in my original email, I need a current controlled resistor. I > haven't used EDD elements (I'm a SPICE user), but this should > work well. I'm primarily module power distribution at module > and package levels, and need the controllable resistor to model > ASIC supply demand. In this case you can use EDD (if you can explicitely formulate the resistor formulae, see below). Place a EDD in schematic and choose 1-branch. In order to formulate a normal resistor, type: I1 = V1/50k In order to formulate any dependency type: I1 = f(V1) whereas f(V1) can be alomost any kind of function depending on V1. V1 stands for voltage across the 1st branch, and I1 for the current through 1st branch. If your resistor is defined by function R=f(I1), then consider R=V1/I1, thus you have: V1/I1 = f(I1) Now try to reformulate this into: I1 = f(V1) that means you need the explicite form for I1... > Another analysis I'd like is to use Fourier transforms to convert a > repetitive transient simulation into a AC simulation. A AC simulation at certain frequencies, correct? > The interconnecting > network would be linear with a simple source. Source at certain (single) frequency? > I think of this as > 'harmonic balance' but I don't believe this is what your harmonic balance > analysis does. I would need to build the individual netlists myself with > separate sources based on an FFT, then simulate with Qucs, and finally > recombine the results myself. Is my understanding correct? If the network AND the source are both linear (source = single freq and network linear), then you can do simple AC, don't you? Best regards, Stefan. ```

 [Qucs-help] controlled resistor element? From: Richard Finstad - 2009-11-15 21:59:10 ```Hi! To adapt an HSPICE simulation to Qucs I need a current controlled resistor, but didn't find a specific component for this. Any suggestions on how I can implement this function? Thanks. Dick ---- ```
 Re: [Qucs-help] controlled resistor element? From: Stefan Jahn - 2009-11-27 19:14:00 ```Am So, 15.11.2009, 22:58 schrieb Richard Finstad: HellO! > Hi! To adapt an HSPICE simulation to Qucs I need a current controlled > resistor, but didn't find a specific component for this. Any suggestions > on how I can implement this function? It depends. Controlled by what? I guess by voltage/current? Or by frequency? If voltage current, then use EDD element with one branch, specifying for instance a "normal" resistor of 50kOhm by I1 = V1/50k Hope this helps, Stefan. ```
 Re: [Qucs-help] controlled resistor element? From: Stefan Jahn - 2009-12-14 14:50:39 ```Am Di, 1.12.2009, 00:01 schrieb Richard Finstad: > Stefan. Hello Richard, > Thank you! As I stated > in my original email, I need a current controlled resistor. I > haven't used EDD elements (I'm a SPICE user), but this should > work well. I'm primarily module power distribution at module > and package levels, and need the controllable resistor to model > ASIC supply demand. In this case you can use EDD (if you can explicitely formulate the resistor formulae, see below). Place a EDD in schematic and choose 1-branch. In order to formulate a normal resistor, type: I1 = V1/50k In order to formulate any dependency type: I1 = f(V1) whereas f(V1) can be alomost any kind of function depending on V1. V1 stands for voltage across the 1st branch, and I1 for the current through 1st branch. If your resistor is defined by function R=f(I1), then consider R=V1/I1, thus you have: V1/I1 = f(I1) Now try to reformulate this into: I1 = f(V1) that means you need the explicite form for I1... > Another analysis I'd like is to use Fourier transforms to convert a > repetitive transient simulation into a AC simulation. A AC simulation at certain frequencies, correct? > The interconnecting > network would be linear with a simple source. Source at certain (single) frequency? > I think of this as > 'harmonic balance' but I don't believe this is what your harmonic balance > analysis does. I would need to build the individual netlists myself with > separate sources based on an FFT, then simulate with Qucs, and finally > recombine the results myself. Is my understanding correct? If the network AND the source are both linear (source = single freq and network linear), then you can do simple AC, don't you? Best regards, Stefan. ```