User_from_the_Earth
Newbie level 2
Hi all:
I have an issue trying to simulate a file based Mixer in VSS AWR simulation Software.
I have modeled the mixer using the file based model. I use the spur table provided by the manufacturer to give this information to VSS.
Ok, so the point is although it is working it doesn't work as it should:
We know that the output voltage of a mixer will be: (K/2)*V_1*V_2
Where K are the device losses and V_1 and V_2 are the LO and RF inputs.
Ok. So, if we use two inputs of 10dBm and -10dBm and we consider K=0 we should have an output of -40dbm.
(Output_voltage)^2 /2r = 20log(output_voltage) - 10log(100)=> -40dBm
Ok, nice. I don't have this level at the mixer output (and, of course, it is specified a 0dBc for this harmonic in the spur table). I have a -30dBm level.
On the other hand I don't really understand what is the "GCONV" parameter exactly. Is it the 20log(k/2) parameter directly? Is it only K? The MWO help doesn't say much about it.
One extra issue:
When I was making some modifications in order to be able to understand what is the issue and what is K exactly, I made some modifications and it reports a warning message:
"MIXER_F.A4 : Estimated signal gain is 0 because the 1,-1 product is not being generated. The MODE parameter may be incorrect for the input and LO center frequencies."
Ok, I guess that maybe it is failing due to the 0 losses parameter (K=0) I used in the probe. But it doesn't make much sense because it says that "The Mode parameter may be incorrect for the input and LO center freq"
BTW: f1=300Mhz f2=255Mhz fout=5Mhz MODE= diff.
I tried to solve it using other posts (BTW: nice books in one of the threads, thanks), MWO help and google in general, but I can't make it.
Thanks to all of you.
Best regards.
PS: In the real simulation I'm not using this GCONV=0 value. It is only to check how this VSS model works.
I have an issue trying to simulate a file based Mixer in VSS AWR simulation Software.
I have modeled the mixer using the file based model. I use the spur table provided by the manufacturer to give this information to VSS.
Ok, so the point is although it is working it doesn't work as it should:
We know that the output voltage of a mixer will be: (K/2)*V_1*V_2
Where K are the device losses and V_1 and V_2 are the LO and RF inputs.
Ok. So, if we use two inputs of 10dBm and -10dBm and we consider K=0 we should have an output of -40dbm.
(Output_voltage)^2 /2r = 20log(output_voltage) - 10log(100)=> -40dBm
Ok, nice. I don't have this level at the mixer output (and, of course, it is specified a 0dBc for this harmonic in the spur table). I have a -30dBm level.
On the other hand I don't really understand what is the "GCONV" parameter exactly. Is it the 20log(k/2) parameter directly? Is it only K? The MWO help doesn't say much about it.
One extra issue:
When I was making some modifications in order to be able to understand what is the issue and what is K exactly, I made some modifications and it reports a warning message:
"MIXER_F.A4 : Estimated signal gain is 0 because the 1,-1 product is not being generated. The MODE parameter may be incorrect for the input and LO center frequencies."
Ok, I guess that maybe it is failing due to the 0 losses parameter (K=0) I used in the probe. But it doesn't make much sense because it says that "The Mode parameter may be incorrect for the input and LO center freq"
BTW: f1=300Mhz f2=255Mhz fout=5Mhz MODE= diff.
I tried to solve it using other posts (BTW: nice books in one of the threads, thanks), MWO help and google in general, but I can't make it.
Thanks to all of you.
Best regards.
PS: In the real simulation I'm not using this GCONV=0 value. It is only to check how this VSS model works.