How to model PLL Fractional N Syntesizer

Hello Everyone I try to model Fractional n pll with AWR Microwave Office my uestion is how can I model fractional n PLL synthesizer with AWR Schematic section not VSS ANyone know please help me

thanks in advance

You really want to model it at transistor level (MWO circuit simulation) instead of block level (VSS system simulation)?

not really I just want to model analog device's PLL in schematic section. I have s parameter result of it and is there any block define p1dB phase noise loop filter ,phase detector, frequency divider...I am just thinking it's possible or not

Mr. Muehlhaus

These elements are in the "system blocks" palette, so I think you will need the VSS license to use them.

Ok thnaks for the info MR. Muehlhaus I will check on that

I recommend you to simulate your Fractional Synthesizer in Matlab Simulink.There are tons of scripts and modelling block in it..

Ok Bigboss I think I must try to figure out how to import matlab script into the awr mwo schematic

Thanks bigboss for the info

You don't have to use MW Office ( of course you can use but not necessary )
You should "MatLab Simulink" to predict the characteristics of a Fractional PLL.Simulink is a Matlab tool and it's designed for system/behavioural/general purpose system simulations.
VSS has also very fine simulation design guide for PLLs, it's of course also used..