How to Convert Bode plot - Magnitude (DB) to Resistance

Hi,

The followng circuit was created in Electrical Simscape.

I have the voltage sensor output to Scope 2 is set to 'Output Measurement' and the signal generator line is set to 'Input Perturbation'.

So the intent is with the transfer function, I plot the resistance in magnitdue portion of the plot.

I select from the top menu 'Analysis' > 'Control Design' > 'Linear Analysis' and then from the pop-up menu, I select 'Bode Plot'.

So I expect to see the magnitude in resistance along the Y-axis (V / I). However, I see the magnitude plot in db instead.

How can I convert the bode plot 'Magnitude' to resistance and not in db?

I think I have to use something like the 'db2mag function'. But how do I implement that in the circuit?

If I change the Y-xaxis to absolute using log scale, the values are not consistent with what I expect.

Any suggestions are appreciated.

[Gus]

I changed the plot from db to abs to illustrate that 'Mag (abs)' is also not consistent with what I would expect the resistance plot to be.

It should settle at around 48 ohms. Perhaps, there is an error somewhere in the circuit.

Answer 1

[Gus]

It's fine. I sorted out the issue. A termination resistor was missing from the circuit.

And I realize now that the 'db2mag'function can be realized just by right clickiing on the bode plot and then going to the appropriate menu, changing the Y-axis from dB to Mag.

Still learingn each day.