A few days ago I watched an excellent Agilent WEB Cast regarding sampling signals using ADC devices basically. This was focused around Agilent Equipment but the principals presented some very interesting possibilities that could be applied to any electronic project that involves an ADC.
The video describes more than you will need to know about Nyquest principals and sampling etc
Did you know that by UNDER sampling you could effectively demodulate an AM Signal, well your not alone, I did not know either, now I do and can not wait to try it
here is a link to the WEB Cast : on-demand recording , You will need to provide a bit of info but the video is well worth the effort.
and the Slides: http://www.home.agilent.com/upload/cmc_upload/All/10July2014WebcastSlides.pdf
Oh and if your into HIGH END ADC's and DACs in the form of rack equipment have a look at these puppies,
8 Chan, 12bit 2Ghz input frequency ADC http://cp.literature.agilent.com/litweb/pdf/5990-8507EN.pdf
12 bit multichannel 12Gsample AWG http://cp.literature.agilent.com/litweb/pdf/5990-7516EN.pdf
4Ghz Logic analyser U4154A Logic Analyzer Data Sheet
pretty impressive stuff
Enjoy
