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cool paper on dithering

Started by John Larkin December 14, 2016
John Larkin wrote:
> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=38&ved=0ahUKEwjG19u1n_TQAhVnrlQKHRUMAEc4HhAWCEgwBw&url=https%3A%2F%2Fwww.cscamm.umd.edu%2Fprograms%2Focq05%2Fadams%2Fadams_ocq05.pdf&usg=AFQjCNFFz_m97QqzWywq87nBJJ5uONIk0A&bvm=bv.141320020,d.cGc&cad=rja > > or maybe > > http://tinyurl.com/zhlgolz
It's easy to eliminate the garbage from a google search link: <https://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf>
> This has some really interesting ideas about extending DAC resolution > with scrambled thermometer codes and such. Some class-D audio stuff, > too. > > I've got to take time to study this; there are a lot of ideas here. > > I want to make a 16-bit multi-channel, maybe 5 MHz, arbitrary waveform > generator, and I have some nice, fast (120 MHz) 14-bit dual DACs in > stock, DAC2904s. They have speed to burn, so I should be able to > dither them up to 16 bits. I can't do simple (wiggle the LSB) > delta-sigma, because the DNL of the DACs is 4 LSBs p-p, so the dither > has to be big enough to smooth out DNL errors too. This will involve > noise shaping of the dither pattern, sort of like a high-order > delta-sigma, where you push the dither spectrum up so the final analog > 5 MHz lowpass filter kills the noise you add. > > I'm playing with that in LT Spice, which is admittedly a clumsy tool > for this sort of thing. > > I have a huge respect, and some envy, for people who are really good > with this signals+systems stuff. I do have a copy of "Signals and > Systems for Dummies." > > > > >
-- Never piss off an Engineer! They don't get mad. They don't get even. They go for over unity! ;-)
On Thu, 22 Dec 2016 21:09:18 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net> wrote:

>John Larkin wrote: >> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=38&ved=0ahUKEwjG19u1n_TQAhVnrlQKHRUMAEc4HhAWCEgwBw&url=https%3A%2F%2Fwww.cscamm.umd.edu%2Fprograms%2Focq05%2Fadams%2Fadams_ocq05.pdf&usg=AFQjCNFFz_m97QqzWywq87nBJJ5uONIk0A&bvm=bv.141320020,d.cGc&cad=rja >> >> or maybe >> >> http://tinyurl.com/zhlgolz > > >It's easy to eliminate the garbage from a google search link: > ><https://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf> > >
Cool. How? -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
John Larkin <jjlarkinxyxy@highlandtechnology.com> writes:

> On Thu, 22 Dec 2016 21:09:18 -0500, "Michael A. Terrell" > <mike.terrell@earthlink.net> wrote: > >>John Larkin wrote: >>> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=38&ved=0ahUKEwjG19u1n_TQAhVnrlQKHRUMAEc4HhAWCEgwBw&url=https%3A%2F%2Fwww.cscamm.umd.edu%2Fprograms%2Focq05%2Fadams%2Fadams_ocq05.pdf&usg=AFQjCNFFz_m97QqzWywq87nBJJ5uONIk0A&bvm=bv.141320020,d.cGc&cad=rja >>> >>> or maybe >>> >>> http://tinyurl.com/zhlgolz >> >> >>It's easy to eliminate the garbage from a google search link: >> >><https://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf> >> >> > > Cool. How?
Looks like I use the "google search link fix" firefox addon. I expect there are others. -- John Devereux
Den fredag den 30. december 2016 kl. 19.49.09 UTC+1 skrev John Larkin:
> On Thu, 22 Dec 2016 21:09:18 -0500, "Michael A. Terrell" > <mike.terrell@earthlink.net> wrote: > > >John Larkin wrote: > >> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=38&ved=0ahUKEwjG19u1n_TQAhVnrlQKHRUMAEc4HhAWCEgwBw&url=https%3A%2F%2Fwww.cscamm.umd.edu%2Fprograms%2Focq05%2Fadams%2Fadams_ocq05.pdf&usg=AFQjCNFFz_m97QqzWywq87nBJJ5uONIk0A&bvm=bv.141320020,d.cGc&cad=rja > >> > >> or maybe > >> > >> http://tinyurl.com/zhlgolz > > > > > >It's easy to eliminate the garbage from a google search link: > > > ><https://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf> > > > > > > Cool. How? >
I used foxit so pdfs show up in downloads, there you can right-click copy link adress
On Fri, 30 Dec 2016 20:47:15 +0000, John Devereux
<john@devereux.me.uk> wrote:

>John Larkin <jjlarkinxyxy@highlandtechnology.com> writes: > >> On Thu, 22 Dec 2016 21:09:18 -0500, "Michael A. Terrell" >> <mike.terrell@earthlink.net> wrote: >> >>>John Larkin wrote: >>>> https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=38&ved=0ahUKEwjG19u1n_TQAhVnrlQKHRUMAEc4HhAWCEgwBw&url=https%3A%2F%2Fwww.cscamm.umd.edu%2Fprograms%2Focq05%2Fadams%2Fadams_ocq05.pdf&usg=AFQjCNFFz_m97QqzWywq87nBJJ5uONIk0A&bvm=bv.141320020,d.cGc&cad=rja >>>> >>>> or maybe >>>> >>>> http://tinyurl.com/zhlgolz >>> >>> >>>It's easy to eliminate the garbage from a google search link: >>> >>><https://www.cscamm.umd.edu/programs/ocq05/adams/adams_ocq05.pdf> >>> >>> >> >> Cool. How? > >Looks like I use the "google search link fix" firefox addon. I expect >there are others.
That works great. Thanks. -- John Larkin Highland Technology, Inc lunatic fringe electronics