building ADS PIN diode model

Hi,

I want to make a variable attenuator by using MA4FCP200 Flip Chip PIN Diode. Data sheet for this diode is here: http://www.macomtech.com/datasheets/MA4FCP200.pdf. I saw in a journal paper they made a variable attenuator with this PIN diode. But I am unable to make a pin diode in ADS with the given value in the data sheet. some of the parameters of this PIN diode which is written in the data sheet are not available in ADS. like Un= 900 cm^2/V-sec, Cj0= 0.03 pF, Cjmin= 0.02 pF, etc. Can some one please help me?

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