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ADS VtLFSR_DT Taps and Seeds

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natnoraa

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Hi everyone,

I have designed a simple QPSK transmitter to test the ACPR and EVM of my PA.

However, I have some trouble with the component VtLFSR_DT in ads. (https://cp.literature.agilent.com/litweb/pdf/ads2004a/ccsrc/ccsrc0518.html)

Apparently the taps and seed will affect my results and I am still lost after looking at the guide as I am an RF guy.

Could someone please let me know what sort of values should i put in them for my simulation?

And in the event that if it is a BPSK, how should i go about doing it? changing the tstep to 1/(1*symbolrate)?

Thanks for the advice in advance

qpsk.JPG

Best Regards,
Aaron
 

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