how to simulate a LNA in mwoffice?

I am simulating a LNA with mwoffice,fistly,I design the topology of the circuit and make the variables with arbitary initial value,then i make the Gain,NF,etc.then i simulate the cicuit. But the result is not satisfied. is this related to the initial value of the variables,or any other reasons.
who can give me some good advice or tell me some skills about how to use mwoffice.
thank you very much

Realy I don't have tested Noise analisis on MWOffice, but a college has tell me to be realy care about it, fase noise and some other analisis has incoherent results. I think he test 5.0 version.

Even, I have a analisis for a LNA at 1.75 GHz, I wiil look for it and post (If I was able to find it),

TaPa

I'm design some LNA in MWO and results was good (I'm using the ATF-54143 as input stage). But the design must be a very accurate - You must input the topology very detailed. Don't trust the MWO microstrip models - it works good only in simple cases and only on low freq. Use the EM-simulation to simulate the complex microstrip structures. Also - use the measured S-parameters of transistor if it is possible - many vendors provides the non-accurate S-matrix in datasheet. The measured NF (on my opinion) always greater than calculated, but the measured NF always greater than the true NF.

Best regards,
Kit-the-great

Hi all one question to kit-the-great.
How do you work, usally ?

Do you use MWO to do approximately design of your microstripstructures
and then you go to Em-simulations to find out the truth.
Can you then do an optimization in CST ?
Kindest regards,
StoppTidigare

Usually my work consist of this steps:
1. Design the non-accurate simulation, using the MS models.
2. Optimize this model using the MWO optimizer.
3. In cases of complex MS structures I'm replace this by MWO EM-structures and do manual optimization of this (it's not so hard as can seems). The using of CST simulation makes a sense only if You simulate a multilayer structure (4 or more layers).

But another problem is correct modeling of components (capacitance, resistors etc.). I'm use the eq. schemes that have been restored from measured data - it's allowed me to use this components in optimization process immediately.

Best regards,
Kit-the-great