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logarithmic time step in a transient simulation

Question asked by DEPAOLA on Aug 7, 2006
Latest reply on Aug 8, 2006 by wrivas

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Hi All!
do someone know if it is possible to setup a transient simulation where the time is swept logarithmically?
Thanks for the help

Francesco

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wrivas Aug 8, 2006 1:13 AM
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I really think that is not posible with current time domain simulation technology. In general either the simulator determines its own time step or you use a fixed time step.

There may be another way however to address the problem. What kind of application do you have in mind and how would a logaritmic time scale help you?
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DEPAOLA Aug 8, 2006 1:30 AM
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Hi wrivas,
thank you for the reply.
I will try to describe to you my problem.
I need to access a data file (through a DAC) that contains time dependent values of a resistor. This file is build from a matlab code and its first column is time while the second is the value of resistance. Unfortunately, the time on the first column is not linear but it is logarithmic. That's why I need to sweep it logarithmic also in the ADS transient analysis so that I can refer to the proper line of thr file by using the variable "timestep".
I hope I was clear. If not please ask me for more info.
Thanks again

Francesco
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wrivas Aug 8, 2006 1:37 AM
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If you are using a DAC (data access component) you do not need to sweep time in the same values as the data. The reason is that the DAC will interpolate the data to determine the value it needs. The DAC has access to several interpolation method (i.e. linear, cubic, etc.). I would worry about having enough data points to accurately be able to interpolate. Let us know if you are successful with this.
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logarithmic time step in a transient simulation

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