New to ADS-trouble with PIN diode switch simulation

[gmetaxas]

Hello everybody, I am new to ADS and I am trying to simulate a switching PIN diode.
Please refer to the attached schematic. I have set the ParamSweep block so that the diode is reverse biased. The crossed-out block is the ADS model of Skyworks SMP1320-075LF PIN diode that I have downloaded from their website; I tried using an ideal (or close to that) model of ADS and even that did not work; in all cases, I keep getting the capacitors connected to ground even with the diode reverse-biased. I plot S(2,1) vs. freq. and see that the response is identical regardless of the diode bias.
What am I doing wrong here? Please advise.

 

[FvM]

Node V_DIODE_A is shorted to ground by voltage source "Logic1".

You may want to use the 2.3k resistor to isolate the voltage source by changing it's position in the circuit. Or preferably use a series choke for RF isolation.

 

[gmetaxas]

Dear FvM, thanks for your suggestion. I changed the position of the resistor in the circuit as you suggested and now everything works as it is intended to.