ADG612 Spice model error: Ron/Roff greater than 1/Gmin

Hi May,

Thank you for your suggestions.

I would agree that it is not ideal to have the drain nodes connected, but this is actually the reason for the simulation in the first place due to constraints in how the part must fit into a larger design. The goal of the simulation is to see if the bandwidth for the output is large enough to fit the design requirements in spite of the resultant output capacitance from the tied-together drains.

However, I tried your suggestion, disconnecting the drains and tying the irrelevant drains to ground. I also show a representative load here of 1k to ground, just for the purpose of the simulation. See the attached schematic (apologies for the messiness, just hacking it up here). Unfortunately, I get the same errors in the PSpice simulation, this "Ron or Roff greater than 1/Gmin for VSwitch..." error (see above).

Thanks again for your help,

JR

Hi May,

Thank you for your suggestions.

I would agree that it is not ideal to have the drain nodes connected, but this is actually the reason for the simulation in the first place due to constraints in how the part must fit into a larger design. The goal of the simulation is to see if the bandwidth for the output is large enough to fit the design requirements in spite of the resultant output capacitance from the tied-together drains.

However, I tried your suggestion, disconnecting the drains and tying the irrelevant drains to ground. I also show a representative load here of 1k to ground, just for the purpose of the simulation. See the attached schematic (apologies for the messiness, just hacking it up here). Unfortunately, I get the same errors in the PSpice simulation, this "Ron or Roff greater than 1/Gmin for VSwitch..." error (see above).

Thanks again for your help,

JR