Hi:
The HP 5100 provides extremely fast frequency transitions. It was used to
generate a 2 to 30 MHz sweep that was close to phase coherent. See:
http://www.prc68.com/I/HP5100.shtml
No PLLs used, just arithmetic.
Have Fun,
Brooke Clarke
http://www.prc68.com
[email protected] wrote:
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
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