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Complex filter and negativ frequency for x-scale for AC simulation

Chrisss

Hi,

I'm currenlty working on complex filter. This filter has been done by a design which left now.

So the first question is, someone told me that to get the Transfert function of this kind filter, I've to combine I way and Q way, but i found no information on complex tools in the calculator.

2nd question is about x-scale. The transfert function (following data found in the design report) is in negativ frequency domain. So my AC simulation is set with a start at -1GHz and end simulation at -1KHz.

During the simulation, no error message but when the AC window is open the x-scale is wrong, and when I try to change x-scale  manually and set -1GHz to -1KHz range, the start frequency is 1GHz.

Thanks in advance for your help.

BR,

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