Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
EVM system design/calculation - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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