User`s guide

Definin
g
Power Supplies 3
-21
Definin
g
Power Supplies
For the Analo
g
Portion of Your
Circuit
If the analog portion of your circuit requires DC power, then you
need to include a DC source in your design. To specify a DC
source, use one of the following symbols.
For A/D Interfaces in Mixed-
Si
g
nal Circuits
Default di
g
ital power supplies
Every digital part supplied in the MicroSim libraries has a
default digital power supply defined for its A-to-D or D-to-A
interface subcircuit. This means that if you are designing a
mixed-signal circuit, then you have a default 5 volt digital power
supply built-in to the circuit at every interface.
Custom di
g
ital power supplies
If needed, you can customize the power supply for different
logic families.
For this source type... Use this symbol...
voltage VDC or VSRC
current IDC or ISRC
For this lo
g
ic family... Use this symbol...
CD4000 CD4000_PWR
To find out how to use these
symbols and specify their
attributes, see the followin
g
:
•
Setting Up a DC Stimulus on
page 9-5
• Using VSRC or ISRC
symbols on page 3-26
To find out how to use these
symbols and specify their di
g
ital
power and
g
round pins, see
Specifying Digital Power
Supplies on page 15-7.