Hi, I am looking for information on how to extract circuit parameters. I have a system, and I can experimentally perform current and voltage measurements. For example, I can measure the voltage response of the system as a function of a given input pulse. In addition, I also have an equivalent circuit model to represent this system, composed of various resistors and capacitors. What I don't know is the resistance and capacitance values for the elements in my equivalent circuit model. I was wondering if there are tools, like SPICE tools, or methods to extract the circuit parameters that would fit the best my experimental data. I have a SPICE extraction tool, however it is designed to extract transistor parameters. I can't find tools that can extract general circuit parameters. I am not sure that I am being very clear, so please let me know if this is confusing, and if you have suggestions on tools and methods. Thanks a lot!