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Forum How do you implement a Single Point Ground in Eagle?

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How do you implement a Single Point Ground in Eagle?

ddamron over 15 years ago

I'm involved in a circuit I'm trying to develop that requires a single point ground.

This circuit is a high current Driver, and the datasheet for the chip I'm using strongly urges the use of a single point ground.

Let me explain...

High Voltage / Current coming into the board, first hits a 100uF electrolytic to suppress spikes.

I need to basically separate my grounds as if they are two signals, ie one for 'logic', and the other for 'drivers'.

The datasheet specifies to join the two grounds at the cap.

Is there any way to force this by using different signals? ie GND vs GNDA

Regards,

Dan Damron

0 huayuliang over 15 years ago

may be you can do it like this:

add a wire on the board editor near to your GND pad or wire, and rename its network to GND.
then you have a new GND wire and no need do it on schematic.
further, if you Ripup the wire that just added, you can get airwire, so you can route it as a new signal.

hope this can help you.
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0 coflynn over 15 years ago

I've just made a library component that is basically two small SMD pads besides each other (connected) for doing the multiple grounds & ensuring they are only connected at once point.

DRC complains a bit but once you ignore that part once in a design you should be ok..
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0 e14 Contributor over 15 years ago

Another option would be to use a single ground plane and draw wires on the restrict layer to make the two circuits meet at a single point.

Brad Avenson
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0 jerryb1 over 15 years ago

What I do is draw the schematic with separate grounds as required with different names, connect them using a resistor with zero ohms. Place that resistor where you want(at the cap). After routing is completed then you can replace the resistor with a trace or actually put in a 0 ohm resistor.
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