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Below are all of the forum threads, including all
the responses to the original posts.
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.