PCB multiple designs surcharge
in [Embedded]
|
Prev: Lab-Standard 49-Port USB Hub
Next: I2C vs SPI
From: John Larkin on 8 Feb 2010 21:51 On Mon, 08 Feb 2010 18:15:51 GMT, Jan Panteltje <pNaonStpealmtje(a)yahoo.com> wrote: >On a sunny day (Mon, 08 Feb 2010 08:59:49 -0800) it happened John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in ><uqf0n5p6kgusok8alc5p2lmq6ke9s26e7v(a)4ax.com>: > >>>Nice, anything above 1GHz or so will probably remain magick to me :-) >> >>To me, too. I haven't the nonlinear device models, the EM software >>tools, or the brute intelligence to predict how some of this stuff >>will behave. So a mixture of instinct, experience, and experiment will >>have to do. >> >>>I simply do not have the equipment to measure that stuff. >> >>I started with flea-market Tek gear, a 547 scope and a 1S2 >>TDR/sampler, about $120 total. Nowadays you can get an 11801 mainframe >>and a 20 GHz TDR/sampling head for around $1500. >> >>ftp://jjlarkin.lmi.net/1S2.jpg > >Nice, at least they had decent knobs beack then :-) >Knobs have evolved faster then us humans, maybe a few generations onward people >will have little forked fingers to toggle those tiny levers :-) > > >>The 11801 is a beast, but it works beautifully. This one is displaying >>a 1 GHz square wave from the successful pin driver circuit on my >>multiple-circuit board, under the Mantis. The sampling head is on an >>extender cable so it can snug right up to the DUT. >> >>ftp://jjlarkin.lmi.net/DSC01371.JPG > >It is a nice big screen, but the edges of the waveform are rounded, >not a real square wave. >< 10GHz bandwidth? The scope is 20 GHz, 17 pS spec'd risetime. It's my pin driver circuit that's slow. Here it is as a product: http://www.highlandtechnology.com/DSS/T860DS.html The undershoot is my bad on the pcb layout. I'll fix that some day. John
From: Jan Panteltje on 9 Feb 2010 08:34 On a sunny day (Mon, 08 Feb 2010 18:51:08 -0800) it happened John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in <r7j1n5p6gklqdoihr5je38hpo7cd3vt9os(a)4ax.com>: >>>ftp://jjlarkin.lmi.net/DSC01371.JPG >> >>It is a nice big screen, but the edges of the waveform are rounded, >>not a real square wave. >>< 10GHz bandwidth? > >The scope is 20 GHz, 17 pS spec'd risetime. It's my pin driver circuit >that's slow. Here it is as a product: > >http://www.highlandtechnology.com/DSS/T860DS.html > >The undershoot is my bad on the pcb layout. I'll fix that some day. > >John Yes, that is what I mean, I could do a board with those speeds, but have no way to check it. Well I have not personally had a request for anything like that, I will keep you in mind if it happens. For equipment, before such a fast scope, on my wish list would be a good *cheap* spectrum analyser Got an email from Altera today, about ASTA and their FPGAs. If I understand it right, that could mean eliminating a PC mobo... and then there are those 18 Gbits / second serial links sigh... http://www.altera.com/education/webcasts/videos/videos-sata-soc-solutions-40nm.html
From: Spehro Pefhany on 15 Feb 2010 14:02
On Sun, 14 Feb 2010 19:51:44 -0800 (PST), the renowned 1 Lucky Texan <alckytxn(a)swbell.net> wrote: >On Feb 14, 8:36�pm, "JosephKK"<quiettechb...(a)yahoo.com> wrote: >> First, remind them just what you are paying them for. >> Then it is time to try some other vendors, just to find out. > >Yeah, a coupla good approaches with 'negotitations' like this are to >ask them "If you were in my position, how would you feel about pricing >like this?" > >also, "Why are you trying so hard to never do business with me again?" The nice thing about combined designs is that you're unlikely to be in all that much of a hurry (otherwise you'd not have bothered combining) so there is time to shop around or ask for a quotation then not place the order if they don't want to do business. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |