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Question regarding spice models for AD8138 and AD8139

Question asked by rkulkar1 on Jul 12, 2011
Latest reply on Aug 15, 2011 by charlyelkhoury



I am trying to simulate spice models. I get this error for both 8138 and 8139 spice models.


"The following branches form a loop of rigid branches (shorts) when added to the circuit."

( I can post which nodes and VCVS nodes for each model)


I'm using cadence virtuoso schematic entry and analog artist with spectre as my simulator.  This error indicates that the models may be incorrect, but I'm reluctant to jump to this conclusion as it happens with 2 amplifiers. Before I debug the problem by drawing out the entire netlist,I am wondering if I am missing something or if someone has seen this issue before.