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  3. 2 names on the same net

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2 names on the same net

LSAUGE
LSAUGE over 3 years ago

Good morning,

For a project, I have a force and a sense line that are connected to the same point. Is there a way in OrCAD Capture to differentiate these two lines (different names), even if they are technically on the same net ? It would be easier to differentiate them in the layout then.

Thanks in advance,

Loïc

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  • EnottonE
    0 EnottonE over 3 years ago

    For these purposes, I use specially created components in the form of resistors of sizes 0603 or 0805, I call them "net short" on the schematic diagram. On the PCB, they look like smd resistors, but there is a shape under them, it will need to assign the "net short" property, select circuit 1, then circuit 2 and execute the "complete net short" command from the context menu by right-clicking.

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  • LSAUGE
    0 LSAUGE over 3 years ago in reply to EnottonE

    I still have a small problem : when I place my component, there is no problem, the two pads are connected together:

    But when I try to connect one of the component pad to another component, the trace between the pad breaks :

    Do you know why it behaves like this ? I can short the pad together again but if there is another solution, I'm all hear.

    Have a nice day,

    Loïc

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  • excellon1
    0 excellon1 over 3 years ago in reply to LSAUGE

    HI,

    If you need to connect two different nets then that can be done with a zero ohm resistor. This does not mean the pads on the resistor are joined together with a trace. "There Not" , The physical resistor component is performing that shorting function.

    By way of an example. Suppose you needed to join the following nets. GND and AGND in your circuit then you use a zero ohm resistor. On your board the resistor gets installed which makes the connection.
    There will be no trace between the two pins.

    It is a bad idea to use "Net-Short" to fool the pcb to accept a connection between two nets because this will not match the schematic.

    Golden rule in any design is the PCB Has to match exactly the schematic. The reason is if an engineer looks at the schematic there is the assumption that what he sees on the schematic will be on the PCB.
    If the PCB is different then you got a time bomb on your hands in particular if an eco is needed later on.

    I highly recommend you don't use "Net Shorts" in the PCB Editor. Just let the zero ohm resistor perform the function that the schematic is trying to convey instead of shorting pins instead !.

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  • excellon1
    0 excellon1 over 3 years ago in reply to LSAUGE

    HI,

    If you need to connect two different nets then that can be done with a zero ohm resistor. This does not mean the pads on the resistor are joined together with a trace. "There Not" , The physical resistor component is performing that shorting function.

    By way of an example. Suppose you needed to join the following nets. GND and AGND in your circuit then you use a zero ohm resistor. On your board the resistor gets installed which makes the connection.
    There will be no trace between the two pins.

    It is a bad idea to use "Net-Short" to fool the pcb to accept a connection between two nets because this will not match the schematic.

    Golden rule in any design is the PCB Has to match exactly the schematic. The reason is if an engineer looks at the schematic there is the assumption that what he sees on the schematic will be on the PCB.
    If the PCB is different then you got a time bomb on your hands in particular if an eco is needed later on.

    I highly recommend you don't use "Net Shorts" in the PCB Editor. Just let the zero ohm resistor perform the function that the schematic is trying to convey instead of shorting pins instead !.

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