ADS Simulation Error

[aar51]

Hello,
I am getting the following error while simulating a RF Crossover ckt:

"Error detected by hpeesofsim during netlist flattening.
`TermG1': Value of `Z' should be positive."

 

[BigBoss]

The complex syntax is wrong. It has to be 0+j*138.564065.
ADS will give an error without Real Part.

 

[aar51]

The complex syntax is wrong. It has to be 0+j*138.564065.
ADS will give an error without Real Part.

I've tried that but it still shows the error. The only workaround I can think of is if I use a value close to zero, i.e. 0.00000000001, but that changes the desired result for frequencies higher than 1GHz.

 

[BigBoss]

Warning detected by hpeesofsim in InitializePorts() during circuit set up.
Port TermG2 re(Z) <= 0, possibly due to extrapolation; setting re(Z)=0.001.
So, re(Z) should be at least 0.001.

It will change the result because you're using pure inductive port that is unusual. Why it's so pure reactive ?
Is there any reason ?

 

[aar51]

Warning detected by hpeesofsim in InitializePorts() during circuit set up.
Port TermG2 re(Z) <= 0, possibly due to extrapolation; setting re(Z)=0.001.
So, re(Z) should be at least 0.001.

It will change the result because you're using pure inductive port that is unusual. Why it's so pure reactive ?
Is there any reason ?

No, there's no particular reason for using that. I needed to match the ports and usually I use this port and haven't run into any problems yet. What other port can I use?

 

[volker@muehlhaus]

Also, the load without real part will not take energy out of the system. I'm afraid you abuse S-parameters here, consider using AC simulation with the appropriate source and load types.

 

[aar51]

Also, the load without real part will not take energy out of the system. I'm afraid you abuse S-parameters here, consider using AC simulation with the appropriate source and load types.

This is just an intermediate part. I will add another TL where the load is then I'll match it with a proper load. But before that i need to validate my theory.

 

[volker@muehlhaus]

This is just an intermediate part. I

But S-parameter simulation doesn't make sense that way. I doubt that you will get anything useful from S-parameter simulation with 0 Ohm real part.