Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
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Below are all of the forum threads, including all
the responses to the original posts.
Post subject: EVM system design/calculation
postPosted: Mon Jun 13, 2005 6:54 am
Joined: Mon Jun 13, 2005 6:49 am
Do any of
you have a recomendation regarding what software to us for making a
link budget showing expected EVM (error vector magnitude).
Should be data like drive level, phase/amplitude ripple in filter, compression
point of amplifier and frequency error in mixer
Unread postPosted: Mon Jun 13, 2005 12:59 pm
Most "budgets" have an assumption of linearity hiding in them somewhere.
The essence of EVM is that the greatest portion results from non-linearity.
In fact, the EVM of a signal from different amplifiers with the same
third-order intercept point can vary significantly.
(and I think you'll need it) !
Unread postPosted: Mon Jun 13, 2005 1:15 pm
Try systemview from eaglware-elanix