In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote:> at my work we've a 128 channel 32 (or 34) bit AD converter !!Just curious: what is it used for ? -- :wq ^X^Cy^K^X^C^C^C^C
1pSec Jitter
Started by ●January 14, 2006
Reply by ●January 17, 20062006-01-17
Reply by ●January 17, 20062006-01-17
Ico wrote:> In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: > > >>at my work we've a 128 channel 32 (or 34) bit AD converter !! > > > Just curious: what is it used for ? >magnetoencephalography (MEG), functional brain imaging, by measuring the magnetic field form active neurons with squids. Stef
Reply by ●January 17, 20062006-01-17
In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote:> Ico wrote: >> In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: >> >>>at my work we've a 128 channel 32 (or 34) bit AD converter !! >> >> Just curious: what is it used for ? > > magnetoencephalography (MEG), functional brain imaging, > by measuring the magnetic field form active neuronsOk, that *is* a bit more high-tech then recording and playing a bit of music, I guess :) Interesting technology !> with squidsPoor squids! -- :wq ^X^Cy^K^X^C^C^C^C
Reply by ●January 17, 20062006-01-17
Stef Mientki wrote:> John Larkin wrote: > > On Mon, 16 Jan 2006 16:30:03 -0500, Spehro Pefhany > > <speffSNIP@interlogDOTyou.knowwhat> wrote: > > > > > >>On Mon, 16 Jan 2006 13:06:15 -0800, the renowned John Larkin > >><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >> > >> > >>>On 14 Jan 2006 18:34:13 -0800, bill.sloman@ieee.org wrote: > >>> > >>> > >>> > >>>>>Why do you need 1 ps jitter? > >>>> > >>>>I'd put my money on the "idiot manager" option. Idiot systems engineers > >>>>also exist - "we've got this circuit which introduces 99psec of jitter, > >>>>and the error budget is 100psec, so the clock can't introduce more than > >>>>1psec of additional jitter". > >>> > >>>Probably the same guy that was upgrading to a 32-bit CPU and needed a > >>>32-bit ADC to match. > >>> > >>>John > >> > >>bits ~= dB/6 > >> > >> > > > > > > So 32 bits is 192 dB. Isn't that just about the ratio of 1 atm to the > > threshold of hearing? > > Technici should be open minded: > "nothing is impossible untill it's proven" > at my work we've a 128 channel 32 (or 34) bit AD converter !!I didn't know that Radboud University was collaborating in the gravity wave detector experiments .... -- Bill Sloman, Nijmegen (even if I'm in Melbourne, Australia at the moment).
Reply by ●January 17, 20062006-01-17
Stef Mientki wrote:> Ico wrote: > > In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: > > > > > >>at my work we've a 128 channel 32 (or 34) bit AD converter !! > > > > > > Just curious: what is it used for ? > > > > magnetoencephalography (MEG), functional brain imaging, > by measuring the magnetic field form active neurons with squids.Working for Peter Hagoort? -- Bill Sloman, Nijmegen
Reply by ●January 17, 20062006-01-17
bill.sloman@ieee.org wrote:> Stef Mientki wrote: > >>John Larkin wrote: >> >>>On Mon, 16 Jan 2006 16:30:03 -0500, Spehro Pefhany >>><speffSNIP@interlogDOTyou.knowwhat> wrote: >>> >>> >>> >>>>On Mon, 16 Jan 2006 13:06:15 -0800, the renowned John Larkin >>>><jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: >>>> >>>> >>>> >>>>>On 14 Jan 2006 18:34:13 -0800, bill.sloman@ieee.org wrote: >>>>> >>>>> >>>>> >>>>> >>>>>>>Why do you need 1 ps jitter? >>>>>> >>>>>>I'd put my money on the "idiot manager" option. Idiot systems engineers >>>>>>also exist - "we've got this circuit which introduces 99psec of jitter, >>>>>>and the error budget is 100psec, so the clock can't introduce more than >>>>>>1psec of additional jitter". >>>>> >>>>>Probably the same guy that was upgrading to a 32-bit CPU and needed a >>>>>32-bit ADC to match. >>>>> >>>>>John >>>> >>>>bits ~= dB/6 >>>> >>>> >>> >>> >>>So 32 bits is 192 dB. Isn't that just about the ratio of 1 atm to the >>>threshold of hearing? >> >>Technici should be open minded: >> "nothing is impossible untill it's proven" >>at my work we've a 128 channel 32 (or 34) bit AD converter !! > > > I didn't know that Radboud University was collaborating in the gravity > wave detector experiments ....I think that's Leiden, we're just looking for brain waves. Stef
Reply by ●January 17, 20062006-01-17
In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote:> bill.sloman@ieee.org wrote: >> Stef Mientki wrote: >> >> I didn't know that Radboud University was collaborating in the gravity >> wave detector experiments .... > > I think that's Leiden, > we're just looking for brain waves.Heavy thoughts ? -- :wq ^X^Cy^K^X^C^C^C^C
Reply by ●January 17, 20062006-01-17
bill.sloman@ieee.org wrote:> Stef Mientki wrote: > >>Ico wrote: >> >>>In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: >>> >>> >>> >>>>at my work we've a 128 channel 32 (or 34) bit AD converter !! >>> >>> >>>Just curious: what is it used for ? >>> >> >>magnetoencephalography (MEG), functional brain imaging, >>by measuring the magnetic field form active neurons with squids. > > > Working for Peter Hagoort? >No, at the ID Stef
Reply by ●January 17, 20062006-01-17
On Mon, 16 Jan 2006 23:18:28 +0000, Glen Walpert wrote:> On Mon, 16 Jan 2006 13:55:42 -0800, John Larkin wrote: >>On Mon, 16 Jan 2006 16:30:03 -0500, Spehro Pefhany wrote: >>>On Mon, 16 Jan 2006 13:06:15 -0800, the renowned John Larkin wrote: >>>>On 14 Jan 2006 18:34:13 -0800, bill.sloman@ieee.org wrote: >>>>>> >>>>>> Why do you need 1 ps jitter? >>>>> >>>>>I'd put my money on the "idiot manager" option. Idiot systems engineers >>>>>also exist - "we've got this circuit which introduces 99psec of jitter, >>>>>and the error budget is 100psec, so the clock can't introduce more than >>>>>1psec of additional jitter". >>>> >>>>Probably the same guy that was upgrading to a 32-bit CPU and needed a >>>>32-bit ADC to match. >>> >>>bits ~= dB/6 >> >>So 32 bits is 192 dB. Isn't that just about the ratio of 1 atm to the >>threshold of hearing? > > Yep, 20 uPa RMS to 1 ATM or 101 kPa RMS is 0 to 194 dB SPL; from the > lowest threshold of hearing for sensitive youngsters to sound levels > on the launchpad during a large rocket launch, way into the nonlinear > region. Now if we could only find a microphone and preamp to cover > the entire range ...I'd think that when you get to a rocket launch or a large bomb blast, you probably won't need to worry too much about preamplifying the signal... ;-) Cheers! Rich
Reply by ●January 17, 20062006-01-17
On Tue, 17 Jan 2006 10:48:10 +0000, Ico wrote:> In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: >> Ico wrote: >>> In comp.arch.embedded Stef Mientki <S.Mientki-nospam@mailbox.kun.nl> wrote: >>> >>>>at my work we've a 128 channel 32 (or 34) bit AD converter !! >>> >>> Just curious: what is it used for ? >> >> magnetoencephalography (MEG), functional brain imaging, >> by measuring the magnetic field form active neurons > > Ok, that *is* a bit more high-tech then recording and playing a bit of > music, I guess :) Interesting technology ! > >> with squids > > Poor squids!Stef probably means SQUIDs. ;-) Cheers! Rich
