Hi Vasile, Thanks for these explanations, I understood every of them ! Next time I'll try to design a PCB, I'll remember these.
Have a good rest :) Cheers, Seb 2010/5/20 vasile surducan <[email protected]> > > > On Thu, May 20, 2010 at 10:36 AM, Sebastien Lelong < > [email protected]> wrote: > >> Hi Vasile, >> >> 2010/5/20 vasile surducan <[email protected]> >> >> >>> If ground planes could be OK, power supply route thickness could be to >>> small (it is denitely too small for the power section of your design). >>> >> >> At which point power supply routes become "normal" routes ? I mean I >> understand routes coming from power supply need to be thick enough, but >> while it supplies all the PCB, it'll become thinner and thinner, right ? I >> guess it depends on components, is there any rule to compute thickness ? >> >> > > The basic rule is: > - define aggressors (highest noisy, highest supply current), use all route > to aggressors as short and as thick as possible, mount aggressors as closed > to the lowest impedance point (which is the power supply) > - define standard circuits, dimension the route size computing the current > required for supply and the copper section (there are plenty trace > calculators on the web) > - define sensitive circuits (ultra high impedance amplifiers, very fast > comparators etc) and route the supply trace in accordance with the circuit > specific ( ultra high impedance needs route shielding, teflon isolation > points, etc, very fast comparators are aggressors and need special care to > keep low the power supply impedances near the IC, etc) > - define RF circuits and use special RF technique for routing them > > >> Power supply and ground routes must be treated as analog paths even for >>> digital designs. >>> >> >> Do you mean analog paths should be quite thick ? >> > > Analog paths in the sense of analog input route in a a microcontroller does > not need to be thick, however choose the size of an analog path at least > double than for a digital (ie digital 10mil, analog 20mil). > > >> Can you tell me more ? >> > > not today, I'm already tired... > >> >> >> Cheers, >> Seb >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<jallib%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/jallib?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<jallib%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
