Create another thread.memomemomemo wrote on Nov 3rd, 2009, 11:31pm:I am having difficult since I am new in simulink.
Basically there is no difference between Ptolemy and Simulink if you can understand concept of equivalent lowpass model for RF bandpass system very correctly.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1245687123Compared to Ptolemy, Simulink have "Frame-based sampling mode" in addition to "Sample-based sampling mode".
On the other hand, Ptolemy have only "Sample-based sampling mode".
memomemomemo wrote on Nov 3rd, 2009, 11:31pm:A guy in a company told me that I can not use simulink at 60GHz or 77GHz because of the sampling.
Why is it?
If your system is not bandpass system,
it is almost impossible to simulate since we can't use equivalent lowpass model or equivalent baseband model.
This is true for both Ptolemy and Simulink.
memomemomemo wrote on Nov 3rd, 2009, 11:31pm:Is it because at baseband, that means a lot of samples?
I had no difficulty to do it so far but I have doubts that I am doing something wrong.
I can't understand what you mean. Which do you mean "true baseband" or "equivalent baseband" ?
memomemomemo wrote on Nov 3rd, 2009, 11:31pm:So is it right modeling?
Show me "signal attributes" of each node, e.g. signal type, sampling rate, etc. You can show them easily in Simulink.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1233929450memomemomemo wrote on Nov 3rd, 2009, 11:31pm:How come can use a rf blockset at passband?
Or is it possible to integrate the circuit s2p models like this in the model?
I can't understand what you mean.
Describe with correct terminologies.
Equivalent lowpass model is not used in the following.
See
http://www.designers-guide.org/Forum/YaBB.pl?num=1245687123You have to make clear followings.
- True Baseband Signal
- Representation of RF Bandpass Signal as Equivalent Baseband Signal
- Representation of RF Bandpass Signal as True RF Bandpass Signal
About phase noise of RF Bandpass Signal, it is impossible to treat it as "Representation of RF Bandpass Signal as True RF Bandpass Signal".
It might be impossible to treat "s2p" file in "True RF Bandpass Signal" as far as you use the following "RF Blockset".
RF Blockset>Physical>Input/Output Ports>Input Port
RF Blockset>Physical>Input/Output Ports>Output Port
RF Blockset>Physical>Black Box Elements>General Passive Network
Instead, create real coefficients FIR model to express S21 as true RF Bandpass model.
Ptolemy can treat "s2p" in both "Equivalent Baseband Signal" and "True RF Bandpass Signal" seamlessly.
Ptolemy calculate complex coefficietns FIR model for former case and real coefficients FIR model for latter case.