Designer’s Guide Community

vp1953

Senior Member

Offline

Posts: 172

sigma delta modulators for PLL
Jul 05^th, 2010, 11:38am

I am looking for material to understand the working of sigma delta modulators for fractional PLL's. Specifically my interest is in MASH type 3 order or higher. It is very difficult to come across references that discuss this and so if anyone can point to any relevant references, it will be greatly appreciated.

Also was wondering what are the �tools out there that can help with the design (e.g. Matlab)?

Thank you in advance

Back to top

IP Logged

raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: sigma delta modulators for PLL Reply #1 - Jul 5^th, 2010, 8:15pm hi, start with dean book and mean while just read about sigma delta modulator basics(for this you can refer any basic ADC book) Thanks, Rajasekhar
Back to top	IP Logged

vp1953 Senior Member Offline Posts: 172	Re: sigma delta modulators for PLL Reply #2 - Jul 6^th, 2010, 10:04am Hi Rajasekhar, Dean's book discusses only a first order SDM. Most ADC's use an analog SDM, not the purely digital SDM's used for dithering in frac plls. I am looking for material on digital SDM with order at least 3. Thank you.
Back to top	IP Logged

Mayank Community Fellow Offline Posts: 334	Re: sigma delta modulators for PLL Reply #3 - Jul 6^th, 2010, 9:00pm Refer "Understanding Delta-Sigma Converters" by Richard Schreier & Gabor C. Temes. You will get MASH 1-1, 1-1-1, 2-1 & so on structures which are commonly used today. --M
Back to top	IP Logged

vp1953 Senior Member Offline Posts: 172	Re: sigma delta modulators for PLL Reply #4 - Jul 7^th, 2010, 8:59am Hi Mayank, Thank you very much for the reference. This is what i was looking for.
Back to top	IP Logged

Lex

Senior Member

Offline

Posts: 201
Eindhoven, Holland

Re: sigma delta modulators for PLL
Reply #5 - Aug 20^th, 2010, 2:19am

Mayank wrote on Jul 6^th, 2010, 9:00pm:

Refer �"Understanding Delta-Sigma Converters" by Richard Schreier & Gabor C. Temes.

You will get MASH 1-1, 1-1-1, 2-1 & so on structures which are commonly used today.

--M

Is the book you mention better than this one:

Delta-Sigma Data Converters: Theory, Design, and Simulation by Steven R. Norsworthy, Richard Schreier, and Gabor C. Temes

For the latter one I hear it is very detailed on different implementations of SDM, and is quite brief on the basic stuff. How is that with the one you mention?

Back to top

IP Logged