Cooper LP800 Guia do Utilizador descarregar pdf (Página 436)

100

101

10 Mixed Analo

/Di

ital Simulation

Reset the power supply power and ground voltages as

required.

For any digital part instance that use the power supply must,

set its IPIN attributes to the power and ground node names

created by the secondary power supply.

Overridin

CD4000 power suppl

volta

throu

hout a schematic

Circuits using CD4000 parts often require power supply

voltages other than the default 5.0 volts supplied by the standard

CD4000_PWR power supply part. If needed, you can override

the power supply voltage for all CD4000 parts in a schematic.

The default power supply nodes used by CD4000 parts are

named $G_CD4000_VDD and $G_CD4000_VSS as created by

the power supply subcircuit CD4000_PWR. This supply

defaults to 5.0 volts. You can override the voltage across these

two nodes by defining values for the parameters named

CD4000_VDD and CD4000_VSS that are referenced by the

CD4000_PWR subcircuit definition.

For example, to change the CD4000_PWR power supply to 12

volts, referenced to ground, you would perform these steps:

Place an instance of the PARAM pseudocomponent from

special.slb.

Modify the PARAM attributes as follows:

NAME1 = CD4000_VDD

VALUE1 = 12.0V

DC4000_VSS is left at its default of 0 volts.

If the reference voltage also needs to be reset, the same method

can be used to define the CD4000_VSS parameter by setting the

NAME2 and VALUE2 attributes of the same PARAM instance.

For example, if you want the supplies to go between -5 volts and

+5 volts (a difference of 10 volts), you should set CD4000_VSS

to -5V and CD4000_VDD to +10V; as a result, CD4000_VDD

is 10 volts above CD4000_VSS, or +5 volts.

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