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HB analysis results with different SELECT options

EngrZM

hi

i am simulating a balun with its input/output matching network through HB analysis (using SNP file). While simulating I am getting two different values let’s say V1 and V2. Through SELECT options (" Terminal / Terminal and V- Reference Terminal / Instance with 2 terminals / Port (fixed R(port)) ") i got similar result (value V1) but using " Net (specify R) / Differential Nets (Specify R) " i am getting another same result (value V2). The value V2 is consistent with the time domain waveform simulated through HB analysis. Can anyone please guide me about the reason or mistake that I am possibly making.

 

Thanks

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  • Andrew Beckett
    I can only imagine that your port impedance isn't 50 ohms or at least doesn't match the value on the direct plot form. The terminal versions use the current through the pin and the voltage on the pin to work out the power; the "port" option retrieves the simulated port impedance and uses that with the voltage to compute the power. The "net" options use the specified port impedance (on the form) to compute the power from the voltage measured.
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  • Andrew Beckett
    I can only imagine that your port impedance isn't 50 ohms or at least doesn't match the value on the direct plot form. The terminal versions use the current through the pin and the voltage on the pin to work out the power; the "port" option retrieves the simulated port impedance and uses that with the voltage to compute the power. The "net" options use the specified port impedance (on the form) to compute the power from the voltage measured.
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