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help with PLL

Question asked by cato on Jul 31, 2011
greetings,

I am trying to simulate a RF PLL (costas loop) demodulator.  I am new to ADS, and I have been learning a lot, but I can't figure out how to get it to work.  I am stuck on two things.

1.  I am not sure how to create a PSK signal to put into my costas loop.  I have been trying to create a sub-project to make the modulator, but I can't get anything to work.  do I have to use a VCO, or can I just make a variable to flip between phases (0, 90, 180, ect)?

2.  I am not sure how to do a simulation where I can just look at the time-domain RF signal (as if I was looking at an oscilloscope).  how does one do this?

Thanks,
Cato  

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