How to connect GND=0V to the outside of circuit (PAD) in symmetrical supply power

[Tahirmis_ic]

Hi everyone,

To have a symmetrical supply power of my design, I have put the VDDA to +1.65 (techno AMC c35 3.3V) and VSSA to -1.65V. And I have several blocs that have one node to GND=0V (for example the positive input of the integrator amp-op). As I have finished the circuit layout, I want to add I/O pads to finalize my circuit. I have different types of pads offered in the PDK : for the power I/O AVDD3ALLP and AGND3ALLP and for the signals I/O APRIOP. I don't know how should I consider GND=0V ? as a supply ? or as a signal ? How should I connect GND=0 to the outside?

Thank you,

 

[Tahirmis_ic]

The Gnd connected to the NI input of my bloc amplifier is considered as a reference equals to 0 V. So, I think that I should to connect it as a signal using I/O APRIOP PAD!

 

[BradtheRad]

Is your load located on or off the pcb? The load is where you connect a power-carrying 0V ground wire. If the load is off the pcb, then the pcb may not need to have a power-carrying 0V ground wire on it.

for example the positive input of the integrator amp-op

Yes, this needs a 0V ground wire. It is a good idea to keep it separate from a power-carrying ground wire, in case the pcb has both.

- - - Updated - - -

0V ground is the node between your power sources.