another board
in [Design]
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From: Nico Coesel on 17 Oct 2009 10:52 John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >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. > >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. Spartan 6 looks nice. Too bad they don't come in PQ208 packages. >The Brat did the layout; not bad for a psychology/softball/beer pong >major. Well, some people can do PCB layouts and others can't. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... "If it doesn't fit, use a bigger hammer!" --------------------------------------------------------------
From: Joerg on 17 Oct 2009 15:14 John Larkin wrote: > On Fri, 16 Oct 2009 18:39:14 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> John Larkin wrote: >>> On Fri, 16 Oct 2009 18:57:05 -0600, don <don> wrote: >>> >>>> John Larkin wrote: >>>>> 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 >>>>> >>>> Which CAD program did he use ?? >>>> >>>> don >>> She. Boys don't play softball in college. It's PADS, version 5. >>> >> Do you think she'll take over the biz some day when you decide to retire? > > I don't think I'll _decide_ to retire. But I offered it to her and she > thought about it for about 19 milliseconds and said yes. > Great! > I have a technical guy I might involve, too. All I want is a desk and > a workbench over in the corner, and a lucrative buyout contract. > Probably to get the money for the Jeep back that she bought from your generous college funding :-) Maybe they let you set up one of the Tek sampling scopes at Zeitgeist ... -- 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 16:35 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
From: John Larkin on 19 Oct 2009 16:37 On Sat, 17 Oct 2009 14:52:24 GMT, nico(a)puntnl.niks (Nico Coesel) wrote: >John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >> >>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. >> >>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. > >Spartan 6 looks nice. Too bad they don't come in PQ208 packages. We've come to prefer BGA packages. Placement/soldering yield is better than leaded parts. In fact, we've had zero BGA problems, if you don't count the one that was placed 90 degrees off. John
From: Jan Panteltje on 19 Oct 2009 17:31
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! |