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PSpice User Guide Mixed analog/digital simulation October 2019 652 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. nodes, which are processed by PSpice A/D to create the circuit fragment shown in the PSpice A/D representation. After interface generation, node 1 is a purely analog node, connecting the resistor, transistor, and the analog inputs of both AtoD subcircuits. Node 2 is also a purely analog node, connecting the resistor and the analog output of the DtoA interface. You can see that PSpice A/D inserted two new digital nodes, 1$AtoD and 1$AtoD2, which connect the outputs of the AtoD interfaces to the inverter inputs. It also created one digital node, 2$DtoA, to connect the output of U1 to the digital input of the DtoA interface. The interface subcircuits PSpice A/D automatically generates are listed in the simulation output file under the section named Generated AtoD and DtoA Interfaces. For the example in Figure 15-1, this section would appear in the simulation output file as shown in Figure 15-2 below. Figure 15-1 Mixed analog/digital circuit before and after interface generation. schematic representation PSpice A/D representation