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Ptolemy cosimulation

Question asked by ucbzp on Feb 1, 2005
Latest reply on Feb 11, 2005 by EKALBASI

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I need to use the Ptolemy with Envelope simulation and I have some problems. The device in the PA is modeled using TOM model. In the test,I send a CW wave to the PA. I tried it in Envelope simulation and cosimulation of Envelope and Ptolemy (the CW signal is generated in Ptolemy and SpectrumAnalyzer is used to look at the signal). The results (output power level) are very different. Thanks.

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EKALBASI Feb 8, 2005 7:27 AM
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Potential mistakes in such simulation would be the improper use of resistors such that in one case same matchings are not duplicated.
Having said that I wonder why someone wants to send a CW signal through a transistor level block using Ptolemy?
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ucbzp Feb 10, 2005 5:18 AM
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I used the CW signal to test how well the Cosimulation matches with the Env simulation. I never used the Cosim before and I would like to know how much I can trust the results.

In my setup, for both cases I used 50 ohm load. Is there any other possible reasons? Thanks.
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EKALBASI Feb 11, 2005 3:44 AM
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There are a number of potential sources. The key is how accurate you are doing your circuit simulation (Envelope/HB). Also the time step you choose could impact the results. In either case, it would be hard to say what the problem is w/o the simulating the circuit.
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Ptolemy cosimulation

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