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BigBoss is right. ADS isn't concerned with input power level for s-parameter simulation. When you actually build it and measure it tho, you need to apply an input power from the Network Analyzer that is low enough such that your amp is operating in the linear region, such that you measure the...
In order to get a better S11 and maintain your NF, you need to use inductive source degeneration. So, a pretty standard, typical LNA in cadance would be a cascode configuration with a small inductance at the source of the bottom device and some inductance at the gate of the bottom device should...
The easiest way would be to set up your spreadsheet to fit a touchstone .s2p file format, then copy and paste it into a text file using notepad (wordpad doesn't do this well) and then run it in ADS.
The other way would be to convert S11 from DB to magnitude (10 ^ (dB_value / 20) ) and then...
Hmm ... The way I would do it is to have the coax start on the side of the radiation box and place the waveguide port on that face. So make the radiation box big enough such that the coax is in the middle of the face of the box. Then make the coax long enough and de-embed to the pin.
Also...
It sounds like you want the s-parameters of the structure by itself, in which case you would de-embed to the edge of the probe.
As far as different lengths of coax giving you different S11, I think that your coax might not be long enough in the first place. I'm thinking that you used a...
If you connect ports 1 and 2 to the VNA, you'll get S11, S12, S22, and S21, but you need all the other ports to be terminated in 50 ohms. Like what biff44 said, connect up the VNA in all the possible configurations until you've measured all the parameters in the S-matrix.
Then, you can take...
I'm confussed on what you did in Momentum. Did you define your substrate, set it up, and then define and set up the mesh before you simulated your s-parameters?
I went ahead and setup your schematic as shown in the first jpg and simulated it in ADS and momentum by just importing it directly to the layout and setting up momentum and then running momentum. My ADS simulation matches yours. However, my momentum simulation is in line with my ads simulation...
Judging by the picture of the schematic, it doesn't seem like you've used the MSTEP block under TLines-Microstrip.
Your conductor goes from width, 'w' to width, 'wc' and this difference in width creates some more parasitic capacitance that isn't realized in the regular ADS simulation. You...
I am trying to conduct some nonlinear simulations in ADS to find IP2, IP3, etc ... I know that one of the main ways to do this is by using a nonlinear model of the amp and doing some harmonic balance and such, but my problem is that I do not have a model.
All I have is measured s-parameters for...
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