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refer the "Specifying digital power supplies" in PSpice user's guide. This section details out the how the digital gate power supply are controlled and how can you customize it. Below is brief note on customization.
To change the CD4000_PWR power supply to 12 volts, referenced to ground:
1. Place an instance of the PARAM pseudo-part from SPECIAL.OLB.
2. Create a new PARAM property as follows: CD4000_VDD = 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 this property 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), 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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