Hello everyone ! I made a two layer pcb in which there are analog &
digital ics so , I made two gnd signals naming AGND & GND . Now I want to
connect these two signals at only at the gnd pin of power connector. When
I tried to naming these signals in Eagle I can give only one name to that
net , But don't want That ? I want separate signals.
The net lines on your schematic represent an electrical connection and once
you connect 2 nets together they are automatically merged into a single net
which can only have one name. Most, if not all, ECAD s/w works like that.
So, how do you solve the common problem of 2 or more ground nets that need
to be connected together at a single point? Well, here's how I do it, but
I'm not saying it's the best or the only solution 
- on the schematic, stick to separate nets and connect only one net to your
power pin (e.g. the GND net)
- on the schematic add a 2-pin jumper part, connect pin 1 to GND and pin 2
to AGND
- when routing the PCB, place the jumper with pin 1 as close as possible to
your power GND pin.
- route the entire board and run a DRC once finished, correct DRC errors if
any until the board is OK
- now "violate" the design rules by shorting pins 1 & 2 of the jumper. Be
aware that this will generate a DRC clearance error, but simply ignore it.
If you dont want to use the jumper principle just leave GND and AGND as 2
separate nets on the schematic and connect only GND to your power pin. When
routing the PCB, add a via with net name AGND somewhere close to the power
pin and route the AGND net, including the via. Again, when routed 100% and
DRC errors free, "violate" the design rules and connect AGND also to your
power pin by routing a trace from the via to the power pin. Alternatively,
delete the via and connect the open AGND track simply to the power pin.
If anybody here knows of a better or simplier way to solve this common
problem, I too would be very happy to hear about it
Cheers,
Robert
"Hemant" <mhamalhemant@gmail.com> wrote in message
news:g0bftc$1hj$1@cheetah.cadsoft.de...
Hello everyone ! I made a two layer pcb in which there are analog &
digital ics so , I made two gnd signals naming AGND & GND . Now I want to
connect these two signals at only at the gnd pin of power connector. When
I tried to naming these signals in Eagle I can give only one name to that
net , But don't want That ? I want separate signals.
The net lines on your schematic represent an electrical connection and once
you connect 2 nets together they are automatically merged into a single net
which can only have one name. Most, if not all, ECAD s/w works like that.
So, how do you solve the common problem of 2 or more ground nets that need
to be connected together at a single point? Well, here's how I do it, but
I'm not saying it's the best or the only solution
- on the schematic, stick to separate nets and connect only one net to your
power pin (e.g. the GND net)
- on the schematic add a 2-pin jumper part, connect pin 1 to GND and pin 2
to AGND
- when routing the PCB, place the jumper with pin 1 as close as possible to
your power GND pin.
- route the entire board and run a DRC once finished, correct DRC errors if
any until the board is OK
- now "violate" the design rules by shorting pins 1 & 2 of the jumper. Be
aware that this will generate a DRC clearance error, but simply ignore it.
If you dont want to use the jumper principle just leave GND and AGND as 2
separate nets on the schematic and connect only GND to your power pin. When
routing the PCB, add a via with net name AGND somewhere close to the power
pin and route the AGND net, including the via. Again, when routed 100% and
DRC errors free, "violate" the design rules and connect AGND also to your
power pin by routing a trace from the via to the power pin. Alternatively,
delete the via and connect the open AGND track simply to the power pin.
If anybody here knows of a better or simplier way to solve this common
problem, I too would be very happy to hear about it
Cheers,
Robert
"Hemant" <mhamalhemant@gmail.com> wrote in message
news:g0bftc$1hj$1@cheetah.cadsoft.de...
Hello everyone ! I made a two layer pcb in which there are analog &
digital ics so , I made two gnd signals naming AGND & GND . Now I want to
connect these two signals at only at the gnd pin of power connector. When
I tried to naming these signals in Eagle I can give only one name to that
net , But don't want That ? I want separate signals.
