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?
worked with Si4133? Thanks for help.
Post subject: Re: Frequency Synthesizer IC
Thu Apr 07, 2005 10:37 am
Has anyone worked with synthesizer ICs of "Silicon Laboratories"?
Is Silicon Laboratories better than National Semiconductors and
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
From 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