[time-nuts] fast freq. synthesis schemes

[BriMDavis at aol.com]

Luis wrote:
>
>  I'm looking for the schemes used on the frequency synthesizers
> that change frequency in few microseconds time (or less)
<snip>
>
>  Does anyone know of some paper or tech notes from
> some instrument or modules that show block diagrams
> of such?
>
 
 I've never done much with fast PLL's, but here's some references
for direct analog and direct digital synthesizers:
 
-----------
 
 One of the "classic" synthesizer books that covers direct
synthesis techniques is available in a reasonably priced 
paperback reprint ( but the photos aren't as nice as I 
recall from the original hardcover ):
 
 Frequency Synthesizers: Theory and Design, Third Edition
Vadim Manassewitsch 
Wiley-Interscience
_http://www.amazon.com/Frequency-Synthesizers-Theory-Vadim-Manassewitsch/dp/
0471772631/_ 
(http://www.amazon.com/Frequency-Synthesizers-Theory-Vadim-Manassewitsch/dp/0471772631/) 
 
-----------
 
My favorite DDS book reprints many of the classic DDS papers:
 
 Direct Digital Frequency Synthesizers
V. Kroupa (ed)
IEEE Press
_http://www.amazon.com/Direct-Digital-Frequency-Synthesizers-Venceslav/dp/07
80334388_ 
(http://www.amazon.com/Direct-Digital-Frequency-Synthesizers-Venceslav/dp/0780334388) 
 
-----------
 
Another good reprint to have on hand, but not specific to
your fast-switching question, is the following:
 
 Phase Noise in Signal Sources (Theory and Application)
W. P. Robins 
Peter Peregrinus Ltd / IEE
_http://www.amazon.com/Phase-Signal-Sources-Theory-Application/dp/086341026X
/_ 
(http://www.amazon.com/Phase-Signal-Sources-Theory-Application/dp/086341026X/) 
 
-----------
 
 This web page about the HP 51xx family includes some HP direct synthesis 
app notes and articles:
 
 _http://www.hpmemory.org/news/5100/hp5100_page_00.htm_ 
(http://www.hpmemory.org/news/5100/hp5100_page_00.htm) 
_http://www.hpmemory.org/an/pdf/an_96.pdf_ 
(http://www.hpmemory.org/an/pdf/an_96.pdf) 
 
-----------
 
 Rick Karlquist's UFFC papers are a great read on direct synthesizer
topology, albeit geared towards a specific application:
 
_http://www.karlquist.com/FCS95.pdf_ (http://www.karlquist.com/FCS95.pdf) 
_http://www.karlquist.com/FCS96.pdf_ (http://www.karlquist.com/FCS96.pdf) 
 
-----------
 
 For IEEE/UFFC members, the UFFC archive is a good resource for 
synthesizer design info:
 
  _http://www.ieee-uffc.org/main/publications/fcs/index.asp_ 
(http://www.ieee-uffc.org/main/publications/fcs/index.asp) 
 
-----------
 
 The basic Comstron frequency plan is summarized in their 1988 patent:
 
  _http://www.google.com/patents?id=bgA7AAAAEBAJ&dq=4725786_ 
(http://www.google.com/patents?id=bgA7AAAAEBAJ&dq=4725786) 
 
 The Comstrons make great lab synthesizers, and are often available
cheap on e$ay but I'd advise keeping a spares unit on hand for
troubleshooting and repair.
 
-----------
 

have fun,
Brian