[time-nuts] fast freq. synthesis schemes
Brooke Clarke
brooke at pacific.net
Wed Oct 21 02:19:25 UTC 2009
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
BriMDavis at aol.com 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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