Is a bad practice make variations on power's tracks width in pcb?












3












$begingroup$


Its is about a circuit to source power and communicate with a car's key. I don't know exactly the current necessary, but I know that it is low, a few mA. The voltages are 5.5V and 3.3V.
The frequency of the signals are not high , a few units of KHz, something near 10kHz.



I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic. The signalized on the figure are GND, and VCC.



enter image description here






pcb-design







share|improve this question









$endgroup$

















    3












    $begingroup$


    Its is about a circuit to source power and communicate with a car's key. I don't know exactly the current necessary, but I know that it is low, a few mA. The voltages are 5.5V and 3.3V.
    The frequency of the signals are not high , a few units of KHz, something near 10kHz.



    I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic. The signalized on the figure are GND, and VCC.



    enter image description here






    pcb-design







    share|improve this question









    $endgroup$















      3












      3








      3


      1



      $begingroup$


      Its is about a circuit to source power and communicate with a car's key. I don't know exactly the current necessary, but I know that it is low, a few mA. The voltages are 5.5V and 3.3V.
      The frequency of the signals are not high , a few units of KHz, something near 10kHz.



      I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic. The signalized on the figure are GND, and VCC.



      enter image description here






      pcb-design







      share|improve this question









      $endgroup$




      Its is about a circuit to source power and communicate with a car's key. I don't know exactly the current necessary, but I know that it is low, a few mA. The voltages are 5.5V and 3.3V.
      The frequency of the signals are not high , a few units of KHz, something near 10kHz.



      I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic. The signalized on the figure are GND, and VCC.



      enter image description here






      pcb-design




      pcb-design






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 9 hours ago









      DanielDaniel

      18510




      18510






















          2 Answers
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          $begingroup$


          I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic.




          At 10 kHz (or probably even 10 MHz), the indicated trace width variations are not significant.



          It's pretty common to have this kind of feature in a design. Particularly when high currents are involved you might want the trace as wide as possible to minimize voltage drop, but need to narrow it down in certain areas to fit other traces or components. In a DC or low-frequency AC power track this will cause no problem as long as the narrow section is short (you could calculate the actual resistance effect and be sure it doesn't exceed your requirements).






          share|improve this answer









          $endgroup$





















            0












            $begingroup$

            I think the significance of trace length and geometry matters for higher frequencies where intereference from reflections can be critical. I think sub < 1 MHz designs shoud be still okay.






            share|improve this answer









            $endgroup$













            • $begingroup$
              This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
              $endgroup$
              – KingDuken
              8 hours ago










            • $begingroup$
              I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
              $endgroup$
              – ammar.cma
              8 hours ago












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            $begingroup$


            I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic.




            At 10 kHz (or probably even 10 MHz), the indicated trace width variations are not significant.



            It's pretty common to have this kind of feature in a design. Particularly when high currents are involved you might want the trace as wide as possible to minimize voltage drop, but need to narrow it down in certain areas to fit other traces or components. In a DC or low-frequency AC power track this will cause no problem as long as the narrow section is short (you could calculate the actual resistance effect and be sure it doesn't exceed your requirements).






            share|improve this answer









            $endgroup$


















              3












              $begingroup$


              I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic.




              At 10 kHz (or probably even 10 MHz), the indicated trace width variations are not significant.



              It's pretty common to have this kind of feature in a design. Particularly when high currents are involved you might want the trace as wide as possible to minimize voltage drop, but need to narrow it down in certain areas to fit other traces or components. In a DC or low-frequency AC power track this will cause no problem as long as the narrow section is short (you could calculate the actual resistance effect and be sure it doesn't exceed your requirements).






              share|improve this answer









              $endgroup$
















                3












                3








                3





                $begingroup$


                I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic.




                At 10 kHz (or probably even 10 MHz), the indicated trace width variations are not significant.



                It's pretty common to have this kind of feature in a design. Particularly when high currents are involved you might want the trace as wide as possible to minimize voltage drop, but need to narrow it down in certain areas to fit other traces or components. In a DC or low-frequency AC power track this will cause no problem as long as the narrow section is short (you could calculate the actual resistance effect and be sure it doesn't exceed your requirements).






                share|improve this answer









                $endgroup$




                I would like to know if variation on tracks's width like the signalized in red on the figure below are very problematic.




                At 10 kHz (or probably even 10 MHz), the indicated trace width variations are not significant.



                It's pretty common to have this kind of feature in a design. Particularly when high currents are involved you might want the trace as wide as possible to minimize voltage drop, but need to narrow it down in certain areas to fit other traces or components. In a DC or low-frequency AC power track this will cause no problem as long as the narrow section is short (you could calculate the actual resistance effect and be sure it doesn't exceed your requirements).







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered 8 hours ago









                The PhotonThe Photon

                86.8k398202




                86.8k398202

























                    0












                    $begingroup$

                    I think the significance of trace length and geometry matters for higher frequencies where intereference from reflections can be critical. I think sub < 1 MHz designs shoud be still okay.






                    share|improve this answer









                    $endgroup$













                    • $begingroup$
                      This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                      $endgroup$
                      – KingDuken
                      8 hours ago










                    • $begingroup$
                      I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                      $endgroup$
                      – ammar.cma
                      8 hours ago
















                    0












                    $begingroup$

                    I think the significance of trace length and geometry matters for higher frequencies where intereference from reflections can be critical. I think sub < 1 MHz designs shoud be still okay.






                    share|improve this answer









                    $endgroup$













                    • $begingroup$
                      This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                      $endgroup$
                      – KingDuken
                      8 hours ago










                    • $begingroup$
                      I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                      $endgroup$
                      – ammar.cma
                      8 hours ago














                    0












                    0








                    0





                    $begingroup$

                    I think the significance of trace length and geometry matters for higher frequencies where intereference from reflections can be critical. I think sub < 1 MHz designs shoud be still okay.






                    share|improve this answer









                    $endgroup$



                    I think the significance of trace length and geometry matters for higher frequencies where intereference from reflections can be critical. I think sub < 1 MHz designs shoud be still okay.







                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered 9 hours ago









                    ammar.cmaammar.cma

                    497312




                    497312












                    • $begingroup$
                      This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                      $endgroup$
                      – KingDuken
                      8 hours ago










                    • $begingroup$
                      I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                      $endgroup$
                      – ammar.cma
                      8 hours ago


















                    • $begingroup$
                      This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                      $endgroup$
                      – KingDuken
                      8 hours ago










                    • $begingroup$
                      I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                      $endgroup$
                      – ammar.cma
                      8 hours ago
















                    $begingroup$
                    This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                    $endgroup$
                    – KingDuken
                    8 hours ago




                    $begingroup$
                    This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
                    $endgroup$
                    – KingDuken
                    8 hours ago












                    $begingroup$
                    I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                    $endgroup$
                    – ammar.cma
                    8 hours ago




                    $begingroup$
                    I think the OP is worried about cross-talk which happens at almost all frequencies. However, my knowledege comes from reading High Speed Design guidelines and iterating through multiple designs.
                    $endgroup$
                    – ammar.cma
                    8 hours ago


















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