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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Differential output of RF transceiver - 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: Frequency Synthesizer IC
Tue Apr 05, 2005 8:48 am
Has anyone worked with synthesizer
ICs of "Silicon Laboratories"?
Is Silicon Laboratories better than
National Semiconductors and Analog Devices?
Who has worked with Si4133?
Thanks for help.
Re: Frequency Synthesizer IC
Unread postPosted: Thu Apr 07, 2005
Has anyone worked with
synthesizer ICs of "Silicon Laboratories"?
Is Silicon Laboratories
better than National Semiconductors and Analog Devices?
Who has worked
with Si4133? Thanks for help.
Their normalized noise contribution
of the chip (dectector,dividers,etc) is about the same. If you are interested
in using an internal VCO (although the Si4133 is not truely internal,
you need external tuning components) then the Si4133 will work for you.
You you want good phase noise aided by a "nice" external VCO, you have
more flexibility with the national or analog devices parts. National
is generally cheaper than Analog Devices, and the later parts released
by National competes well with analog devices in performance. Other
factors such as max RF freq, max detector freq, divider resolution,
etc, may determine who you use.
I don't work for any of these
Unread postPosted: Thu Apr 07, 2005 10:55 am
my experience with ADF4360 synthersizers with integrated VCO, their
phase noise performance is less compared to a synthesizer with independent
VCO. The main advantage is of course less board space.
If you can
afford board space I would recommend to choose the good old technique
of discrete VCO and discrete PLL IC.