Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Mixed analog/digital simulation October 2019 649 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. 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. Creating a secondary CD4000, TTL, or ECL power supply Designs using CD4000, TTL, or ECL parts may require power supply voltages in addition to the default 5.0 volts supplied by the standard CD4000_PWR power supply part. To create a secondary power supply for any one of the CD4000, TTL, or ECL technologies, you must place the appropriate power supply part and create user-defined nodes with a new voltage value. Note: Designs with TTL and ECL parts rarely require secondary power supplies. If needed, however, you can use this procedure to add a secondary power supply for TTL and ECL parts. To create and use a secondary CD4000 power supply with nodes MY_VDD and MY_VSS and a voltage of 3.5 volts: 1. Place the CD4000_PWR power supply and modify the appropriate pin properties as follows: VOLTAGE = 3.5V PSPICEDEFAULTNET = MY_VDD PSPICEDEFAULTNET = MY_VSS 2. Select a CD4000 part in the schematic to which the new power supply should apply, then change the appropriate pin properties as follows: