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Is a bad practice make variations on power's tracks width in pcb?
The Next CEO of Stack OverflowBypass capacitors needed in low-frequency digital logic systems?VCC trace routing on a two-layer board with TQFP chipPCB and trace design for high-speed TTLReturn current in 8 Layer stackupRouting a buck/boost DC/DC converterProper GND pours for two-layer PCBs?Restrict area trouble in EagleDetails on PCB layout for microcontrollerPCB layout: am I doing local power nets correctly?Choosing the right stackup for 6 or 8 layers
$begingroup$
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.
pcb-design
asked 7 hours ago
DanielDaniel
18510
$endgroup$
add a comment |
$begingroup$
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.
pcb-design
asked 7 hours ago
DanielDaniel
18510
$endgroup$
add a comment |
$begingroup$
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.
pcb-design
asked 7 hours ago
DanielDaniel
18510
$endgroup$
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.
pcb-design
pcb-design
asked 7 hours ago
DanielDaniel
18510
asked 7 hours ago
DanielDaniel
18510
asked 7 hours ago
DanielDaniel
18510
asked 7 hours ago
DanielDaniel
18510
asked 7 hours ago
DanielDaniel
18510
18510
add a comment |
add a comment |
2 Answers
2
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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).
answered 6 hours ago
The PhotonThe Photon
86.8k398202
$endgroup$
add a comment |
$begingroup$
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.
answered 7 hours ago
ammar.cmaammar.cma
497312
$endgroup$
$begingroup$
This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
$endgroup$
– KingDuken
7 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
6 hours ago
add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
active
oldest
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active
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active
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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).
answered 6 hours ago
The PhotonThe Photon
86.8k398202
$endgroup$
add a comment |
$begingroup$
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).
answered 6 hours ago
The PhotonThe Photon
86.8k398202
$endgroup$
add a comment |
$begingroup$
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).
answered 6 hours ago
The PhotonThe Photon
86.8k398202
$endgroup$
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).
answered 6 hours ago
The PhotonThe Photon
86.8k398202
answered 6 hours ago
The PhotonThe Photon
86.8k398202
answered 6 hours ago
The PhotonThe Photon
86.8k398202
answered 6 hours ago
The PhotonThe Photon
86.8k398202
86.8k398202
add a comment |
add a comment |
$begingroup$
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.
answered 7 hours ago
ammar.cmaammar.cma
497312
$endgroup$
$begingroup$
This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
$endgroup$
– KingDuken
7 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
6 hours ago
add a comment |
$begingroup$
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.
answered 7 hours ago
ammar.cmaammar.cma
497312
$endgroup$
$begingroup$
This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
$endgroup$
– KingDuken
7 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
6 hours ago
add a comment |
$begingroup$
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.
answered 7 hours ago
ammar.cmaammar.cma
497312
$endgroup$
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.
answered 7 hours ago
ammar.cmaammar.cma
497312
answered 7 hours ago
ammar.cmaammar.cma
497312
answered 7 hours ago
ammar.cmaammar.cma
497312
answered 7 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
7 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
6 hours ago
add a comment |
$begingroup$
This is a fair answer but is there anything to provide any proof? i.e. standard specifications that talk about track widths?
$endgroup$
– KingDuken
7 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
6 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
7 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
7 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
6 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
6 hours ago
add a comment |
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