AnsweredAssumed Answered

DRC friendly symbol creation - pin type

Question asked by milostnik on Jan 25, 2018
Latest reply on Jan 29, 2019 by phiet

Hello Folks,


The new symbol editor extended the possibility to add more specific pin types, as to improve on the DRC check performed on schematic.

One of the improvement is the introduction of the pin type attribute POWER and GROUND, that gets checked in design check.


On a digital chip there is simplicity: all that is powered by a positive tension gets the POWER attribute, while all that is connected to a reference plane or negative gets GROUND.


The dilemma that I have right now is on a OpAmp. Here the two power rails are connected to a power if there is a symmetrical power supply. But many times the negative power is connected to GND if there is only one power supply. In the second case the DRC will flag an error, as the POWER pin is connected to the GND in the schematic.


Since the library can have only one pin type attribute, I have a dilemma. Should I put POWER (as we have) or should I put GROUND as attribute to the pin type?



Has anyone got an idea on how to solve this dilemma?