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Invisible power pins on opamp fail to connect to global net

John Davies
I have a library of opamps that I use for teaching, which includes capture symbols and pspice models. All worked well with release 16.2 but two problems have arisen in 16.3. The first is that I hide the power pins using the "Pin Visible" check box in the Pin Properties dialog box. Power is provided through power symbols called V+ and V- somewhere in the circuit, which create global nets. This no longer works in 16.3. Now I have to make the pin visible using the same dialog box. It is not necessary to draw a wire to the pin, just to make it visible; it then connects to the global net. I am not sure whether this is part of the enhanced power pins features in release 16.3 or whether it is a bug.
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  • From a quick test with 16.2.s003 Jul 8 2009, this did not work in 16.2 either, global power nets are created and connected for the PCB netlist formats but not for the PSpice netlist. Equally, if you create a PCB netlist, there will be no V+ / V- nets, apart from the device pins since the PSpiceOnly property will get the sources removed from a PCB netlist.

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  • From a quick test with 16.2.s003 Jul 8 2009, this did not work in 16.2 either, global power nets are created and connected for the PCB netlist formats but not for the PSpice netlist. Equally, if you create a PCB netlist, there will be no V+ / V- nets, apart from the device pins since the PSpiceOnly property will get the sources removed from a PCB netlist.

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