Hallo, is there anybody who can help me to find out the scheme of a 16-bit delta-sigma adc? I have already made some searches into google but I don't have found interesting informations. Many Thanks Marco Toschi
Sigma-Delta A/D
Started by ●October 28, 2005
Reply by ●October 29, 20052005-10-29
Marco, This any good? http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 Ciao, Syms. "Marco" <marcotoschi@nospam.it> wrote in message news:djtebp$m2k$1@nnrp.ngi.it...> Hallo, > is there anybody who can help me to find out the scheme of a 16-bit > delta-sigma adc? > > I have already made some searches into google but I don't have found > interesting informations. >
Reply by ●October 30, 20052005-10-30
"Symon" <symon_brewer@hotmail.com> wrote in message news:4363c605$0$41142$14726298@news.sunsite.dk...> Marco, > This any good? > http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 > Ciao, Syms. > "Marco" <marcotoschi@nospam.it> wrote in message > news:djtebp$m2k$1@nnrp.ngi.it... >> Hallo, >> is there anybody who can help me to find out the scheme of a 16-bit >> delta-sigma adc? >> >> I have already made some searches into google but I don't have found >> interesting informations. >> > >Very Good!!! Many Thanks Marco
Reply by ●October 30, 20052005-10-30
"Symon" <symon_brewer@hotmail.com> wrote in message news:4363c605$0$41142$14726298@news.sunsite.dk...> Marco, > This any good? > http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 > Ciao, Syms. > "Marco" <marcotoschi@nospam.it> wrote in message > news:djtebp$m2k$1@nnrp.ngi.it... >> Hallo, >> is there anybody who can help me to find out the scheme of a 16-bit >> delta-sigma adc? >> >> I have already made some searches into google but I don't have found >> interesting informations. >> > >Now I'm trying to implement the sigma delta a/d. The range of my analog input will be from 0 to 3.3V Here the scheme of delta sigma modulator: _______ ________ __________ Analog In --|diff.amp.|---|Integrator|---|Comparator|----> dig.filter --| | | | |with gnd | | | | | ________ | ---------| 1-bit dac|------------------------- | | It's not clear the function of 1-bit DAC. If it's only 1 bit it should be as a switch, so, in my case, a comparator connected to ground. And also diff.amp should be a comparator? I think I'm making a mistake. Could you explain where is wrong? Many Thanks Marco
Reply by ●October 30, 20052005-10-30
Marco skrev:> "Symon" <symon_brewer@hotmail.com> wrote in message > news:4363c605$0$41142$14726298@news.sunsite.dk... > > Marco, > > This any good? > > http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 > > Ciao, Syms. > > "Marco" <marcotoschi@nospam.it> wrote in message > > news:djtebp$m2k$1@nnrp.ngi.it... > >> Hallo, > >> is there anybody who can help me to find out the scheme of a 16-bit > >> delta-sigma adc? > >> > >> I have already made some searches into google but I don't have found > >> interesting informations. > >> > > > > > > > Now I'm trying to implement the sigma delta a/d. > The range of my analog input will be from 0 to 3.3V > > Here the scheme of delta sigma modulator: > > _______ ________ __________ > Analog In --|diff.amp.|---|Integrator|---|Comparator|----> dig.filter > --| | | | |with gnd | > | > | > | > | ________ | > ---------| 1-bit dac|------------------------- > | | > > It's not clear the function of 1-bit DAC. If it's only 1 bit it should be as > a switch, so, > in my case, a comparator connected to ground. > And also diff.amp should be a comparator? > > I think I'm making a mistake. > > Could you explain where is wrong? > > Many Thanks > Marcoyour scheme is hard to read, you probably used tabs instead of spaces. the DAC should output 0v and 3.3V, your comparator should have a 3.3/2= 1.65V reference -Lasse
Reply by ●October 30, 20052005-10-30
langwadt@ieee.org wrote:> Marco skrev: > > >>"Symon" <symon_brewer@hotmail.com> wrote in message >>news:4363c605$0$41142$14726298@news.sunsite.dk... >> >>>Marco, >>>This any good? >>>http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 >>>Ciao, Syms. >>>"Marco" <marcotoschi@nospam.it> wrote in message >>>news:djtebp$m2k$1@nnrp.ngi.it... >>> >>>>Hallo, >>>>is there anybody who can help me to find out the scheme of a 16-bit >>>>delta-sigma adc? >>>> >>>>I have already made some searches into google but I don't have found >>>>interesting informations. >>>> >>> >>> >> >>Now I'm trying to implement the sigma delta a/d. >>The range of my analog input will be from 0 to 3.3V >> >>Here the scheme of delta sigma modulator: >> >> _______ ________ __________ >>Analog In --|diff.amp.|---|Integrator|---|Comparator|----> dig.filter >> --| | | | |with gnd | >>| >> | >>| >> | ________ | >> ---------| 1-bit dac|------------------------- >> | | >> >>It's not clear the function of 1-bit DAC. If it's only 1 bit it should be as >>a switch, so, >>in my case, a comparator connected to ground. >>And also diff.amp should be a comparator? >> >>I think I'm making a mistake. >> >>Could you explain where is wrong? >> >>Many Thanks >>Marco > > > your scheme is hard to read, you probably used tabs instead of spaces. > the DAC should output 0v and 3.3V, your comparator should have a 3.3/2= > > 1.65V reference > > -Lasse >To answer another of Marco's questions, the diff. amp should not be a comparator. It must have a linear output and will usually be based on an op. amp. Regards, John
Reply by ●October 30, 20052005-10-30
"John Monro" <johnmonro@optusnet.com.au> wrote in message news:4364b60d$0$30257$afc38c87@news.optusnet.com.au...> langwadt@ieee.org wrote: >> Marco skrev: >> >> >>>"Symon" <symon_brewer@hotmail.com> wrote in message >>>news:4363c605$0$41142$14726298@news.sunsite.dk... >>> >>>>Marco, >>>>This any good? >>>>http://www.maxim-ic.com/appnotes.cfm/appnote_number/1870 >>>>Ciao, Syms. >>>>"Marco" <marcotoschi@nospam.it> wrote in message >>>>news:djtebp$m2k$1@nnrp.ngi.it... >>>> >>>>>Hallo, >>>>>is there anybody who can help me to find out the scheme of a 16-bit >>>>>delta-sigma adc? >>>>> >>>>>I have already made some searches into google but I don't have found >>>>>interesting informations. >>>>> >>>> >>>> >>> >>>Now I'm trying to implement the sigma delta a/d. >>>The range of my analog input will be from 0 to 3.3V >>> >>>Here the scheme of delta sigma modulator: >>> >>> _______ ________ __________ >>>Analog In --|diff.amp.|---|Integrator|---|Comparator|----> dig.filter >>> --| | | | |with gnd >>> | >>>| >>> | >>>| >>> | ________ >>> | >>> ---------| 1-bit dac|------------------------- >>> | | >>> >>>It's not clear the function of 1-bit DAC. If it's only 1 bit it should be >>>as >>>a switch, so, >>>in my case, a comparator connected to ground. >>>And also diff.amp should be a comparator? >>> >>>I think I'm making a mistake. >>> >>>Could you explain where is wrong? >>> >>>Many Thanks >>>Marco >> >> >> your scheme is hard to read, you probably used tabs instead of spaces. >> the DAC should output 0v and 3.3V, your comparator should have a 3.3/2= >> >> 1.65V reference -Lasse >> > > To answer another of Marco's questions, the diff. amp should not be a > comparator. It must have a linear output and will usually be based on an > op. amp. > > > Regards, > John >Is it possible to use 2 LVDS pins? Marco
Reply by ●October 30, 20052005-10-30
An.In --|diff.amp.|--|Integrator|--|Comparator|-+- dig.filt
+-| | | | |with gnd | |
| |
| ________ |
------------| 1-bit dac|-------------------
| |
Sorry, I hope this would be more clear
Reply by ●October 30, 20052005-10-30
You could see a clear picture at the following link: http://www.maxim-ic.com/images/appnotes/1870/A237Fig04.gif The integrator can be made with a 1-bit accumulator? And differential amplifier can be made using a IBUFDS? Many Thanks Marco
Reply by ●October 31, 20052005-10-31
Marco schrieb:> Hallo, > is there anybody who can help me to find out the scheme of a 16-bit > delta-sigma adc?Look for US Patents 6,351,145 and 6,246,258 at http://patft.uspto.gov/ They are about implementing ADCs by using differential FPGA inputs as analog comparators. Kolja Sulimma
