User`s guide

14 Mixed Analo

/Di

ital Simulation

resistance) subcircuit parameter values are also obtained from

the same I/O model.

After the interface subcircuit calls, PSpice A/D inserts one or

more interface power supply subcircuits. The subcircuit name is

specified in the I/O model for the digital primitive at the

interface. In the above example, PSpice A/D inserted

DIGIFPWR, which is the power supply subcircuit used by all

TTL device models in the model library. DIGIFPWR creates the

global nodes $G_DPWR and $G_DGND, which are the default

nodes used by each TTL device.

**** Generated AtoD and DtoA Interfaces ****

* Analog/Digital interface for node 1

* Moving X1.U1:.A from analog node 1 to new digital node

* 1$AtoD

X$1_AtoD1 1 1$AtoD $G_DPWR $G_DGND AtoD_STD

+ PARAMS: CAPACITANCE= 0

* Moving X2.U1:.A from analog node 1 to new digital node

* 1$AtoD2

X$1_AtoD2 1 1$AtoD $G_DPWR $G_DGND AtoD_STD

+ PARAMS: CAPACITANCE= 0

* Analog/Digital interface for node 2

** Moving X1.U1.Y from analog node 2 to new digital node

* 2$DtoA

X$2_DtoA1 2$DtoA 2 $G_DPWR $G_DGND DtoA_STD

+ PARAMS: DRVL=0 DRVH=0 CAPACITANCE=0

* Analog/Digital interface power supply subcircuit

X$DIGIFPWR 0 DIGIFPWR

.END ;(end of AtoD and DtoA interfaces)

ure 15-2

Simulation Output for Mixed Analog/Digital

Circuit