another board
in [Design]
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From: Jim Thompson on 19 Oct 2009 17:37 On Mon, 19 Oct 2009 13:35:12 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sat, 17 Oct 2009 11:15:55 GMT, Jan Panteltje ><pNaonStpealmtje(a)yahoo.com> wrote: > >>On a sunny day (Fri, 16 Oct 2009 17:48:23 -0700) it happened John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in >><o64id55qciubeulpeqepl0ci85ed1hebs5(a)4ax.com>: >> >>> >>>ftp://jjlarkin.lmi.net/Board39.jpg >>> >>>This is an 8-layer mixed-signal thing. On the left is a PCIe interface >>>to a Kontron mini-ITX sbc. >>> >>>Upper-right is a cluster of five spread-spectrum switching regulators, >>>all inductor isolated from everything coming and going. I may slice >>>some ground planes around there just to terrify Joerg. >>> >>>The brown pour is where the pipeline ADC is, differential fed from the >>>two SMB connectors to its right. >>> >>>This also has a couple of 128 Ms/s arbs and tons of various digital >>>i/o things and some DDR2 dram to feed the arbs, and a programmable >>>microengine to fire shots. The FPGA is a Spartan 6/45, which we >>>actually have now. >>> >>>The Brat did the layout; not bad for a psychology/softball/beer pong >>>major. >>> >>>John >> >>Yea, but does it work? > >It's not built yet. Of course it will work, hopefully the rev A etch. > >John > Thanks so much for providing ample data for a troll-feeder filter. -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 |
From: John Devereux on 19 Oct 2009 17:50 Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> writes: > On Mon, 19 Oct 2009 13:35:12 -0700, John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sat, 17 Oct 2009 11:15:55 GMT, Jan Panteltje >><pNaonStpealmtje(a)yahoo.com> wrote: >> >>>On a sunny day (Fri, 16 Oct 2009 17:48:23 -0700) it happened John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in >>><o64id55qciubeulpeqepl0ci85ed1hebs5(a)4ax.com>: >>> >>>> >>>>ftp://jjlarkin.lmi.net/Board39.jpg >>>> >>>>This is an 8-layer mixed-signal thing. On the left is a PCIe interface >>>>to a Kontron mini-ITX sbc. >>>> >>>>Upper-right is a cluster of five spread-spectrum switching regulators, >>>>all inductor isolated from everything coming and going. I may slice >>>>some ground planes around there just to terrify Joerg. >>>> >>>>The brown pour is where the pipeline ADC is, differential fed from the >>>>two SMB connectors to its right. >>>> >>>>This also has a couple of 128 Ms/s arbs and tons of various digital >>>>i/o things and some DDR2 dram to feed the arbs, and a programmable >>>>microengine to fire shots. The FPGA is a Spartan 6/45, which we >>>>actually have now. >>>> >>>>The Brat did the layout; not bad for a psychology/softball/beer pong >>>>major. >>>> >>>>John >>> >>>Yea, but does it work? >> >>It's not built yet. Of course it will work, hopefully the rev A etch. >> >>John >> > > Thanks so much for providing ample data for a troll-feeder filter. If your intention is not just to filter out people you class as "liberals", but also anyone who ever replies to someone who you think is a "liberal"... I think you'll find that is pretty much everyone :) -- John Devereux
From: Joerg on 19 Oct 2009 18:00 Jan Panteltje wrote: > On a sunny day (Mon, 19 Oct 2009 13:35:12 -0700) it happened John Larkin > <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in > <8ajpd5p5q7r1nsg7pukve6nap126fv5ke6(a)4ax.com>: > >>>> The Brat did the layout; not bad for a psychology/softball/beer pong >>>> major. >>>> >>>> John >>> Yea, but does it work? >> It's not built yet. Of course it will work, hopefully the rev A etch. >> >> John > > Once I designed a circuit with some digital and also some analog audio on it. > Gave the diagram to a (very good actually) PCB design house, for prototype print. > When testing it found a noise from the digital in the audio. > The differential audio lines were not kept together (as I told them to do), > but one went for a detour.... > It is very difficult if you are not an electronics designer very familiar with > the circuit's operation to make a good PCB. > psychology and softball does not help a bit, may work for digital, to a point, > but for very low level signals it would be a real miracle if it all worked as > intended. > Same for RF stuff. > And [talking of miracles] again I did not win the lotto! > Thou shalt not release a design without at least a final Gerber check. I have a very seasoned layouter but still we go through 5-10 rounds of Gerber checks on every layout. Minor stuff but needs to be done. It's so easy for an important drill size or something to fall through the cracks. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: John Larkin on 19 Oct 2009 18:28 On Mon, 19 Oct 2009 21:31:20 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >On a sunny day (Mon, 19 Oct 2009 13:35:12 -0700) it happened John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in ><8ajpd5p5q7r1nsg7pukve6nap126fv5ke6(a)4ax.com>: > >>>>The Brat did the layout; not bad for a psychology/softball/beer pong >>>>major. >>>> >>>>John >>> >>>Yea, but does it work? >> >>It's not built yet. Of course it will work, hopefully the rev A etch. >> >>John > >Once I designed a circuit with some digital and also some analog audio on it. >Gave the diagram to a (very good actually) PCB design house, for prototype print. >When testing it found a noise from the digital in the audio. >The differential audio lines were not kept together (as I told them to do), >but one went for a detour.... >It is very difficult if you are not an electronics designer very familiar with >the circuit's operation to make a good PCB. Yes. That's why the circuit designer must stay very close to the layout. >psychology and softball does not help a bit, may work for digital, to a point, >but for very low level signals it would be a real miracle if it all worked as >intended. We pass PCB file ownership back and forth, and talk about things a lot. I'd do that with any layout person. I re-routed the PCIe lines and a bunch of clocks, and did the power switcher section myself, and played around with the bypassing. Two more people will review the schematic and layout, too. This board is a real mix of technologies and functions. >Same for RF stuff. >And [talking of miracles] again I did not win the lotto! Even when you win you usually lose. It's designed that way. John
From: YD on 19 Oct 2009 23:25
Late at night, by candle light, John Devereux <john(a)devereux.me.uk> penned this immortal opus: >Jim Thompson <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> writes: > >> On Mon, 19 Oct 2009 13:35:12 -0700, John Larkin >> <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 17 Oct 2009 11:15:55 GMT, Jan Panteltje >>><pNaonStpealmtje(a)yahoo.com> wrote: >>> >>>>On a sunny day (Fri, 16 Oct 2009 17:48:23 -0700) it happened John Larkin >>>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in >>>><o64id55qciubeulpeqepl0ci85ed1hebs5(a)4ax.com>: >>>> >>>>> >>>>>ftp://jjlarkin.lmi.net/Board39.jpg >>>>> >>>>>This is an 8-layer mixed-signal thing. On the left is a PCIe interface >>>>>to a Kontron mini-ITX sbc. >>>>> >>>>>Upper-right is a cluster of five spread-spectrum switching regulators, >>>>>all inductor isolated from everything coming and going. I may slice >>>>>some ground planes around there just to terrify Joerg. >>>>> >>>>>The brown pour is where the pipeline ADC is, differential fed from the >>>>>two SMB connectors to its right. >>>>> >>>>>This also has a couple of 128 Ms/s arbs and tons of various digital >>>>>i/o things and some DDR2 dram to feed the arbs, and a programmable >>>>>microengine to fire shots. The FPGA is a Spartan 6/45, which we >>>>>actually have now. >>>>> >>>>>The Brat did the layout; not bad for a psychology/softball/beer pong >>>>>major. >>>>> >>>>>John >>>> >>>>Yea, but does it work? >>> >>>It's not built yet. Of course it will work, hopefully the rev A etch. >>> >>>John >>> >> >> Thanks so much for providing ample data for a troll-feeder filter. > >If your intention is not just to filter out people you class as >"liberals", but also anyone who ever replies to someone who you think is >a "liberal"... > >I think you'll find that is pretty much everyone :) He'll sit fat and happy that the world has finally come to agree with him. Never give it a thought that there's at most a couple of dozen posts daily, and always by the same handful of peeps. - YD. -- Remove HAT if replying by mail. |