Question: Transfer Function

Hi Guys,

I am trying to do the following and here is the issue:

> System*Transfer*Functions;
Power Stage Transfer Function:
> He := s^2/`ωn`^2+s/(`ωn`*Qn)+1;
>
Compensation Netwrok Transfer Function:
> Av := gm*(1+s/`ωcz1`)(1+s/`ωcz2`)/((Cc+Rc)*s*(1+s/`ωcp`));

>
Loop Transfer Function:
> Loop := Vref*RL*(1+s/`ωesr`)*Av/(Vout*Ri*(1+s/`ωp1`)*He);

> sys3 := TransferFunction(Loop);

Warning, transfer-function(s) are not rational-polynomial(s) in s

 

I want to do the TF and Bode Plot for this complex system... 

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