Simulation with SIMPLIS digital devices is 10 to 20 times faster than
with SIMPLIS classic digital devices for circuits which have a large number
of digital components. Other benefits of using the SIMPLIS digital devices
include the following:
- Digital clock frequencies can be much higher than the switching
frequency of the power supply.
- SIMPLIS digital devices effectively reduce overall power supply
simulation complexity by using high-level macro models, such as counters,
adders, multipliers, etc.
- The simulation speed of digitally controlled power supplies is
as fast as those with comparable analog functionality.
Simulation speed increases the more you isolate SIMPLIS digital content
from the analog circuit. Some general rules apply:
- In general, simulations run faster if you use SIMPLIS digital devices
as much as possible.
- As much as possible, minimize the number of interfaces
across the analog-digital component boundary by designing your
circuitry to isolate "large Islands" of digital content.
A ground-reference pin is not required for SIMPLIS digital components
within this digital island if they are not connected to any analog
components.
- Strategically, cross from the analog-to-digital and digital-to-analog
domains in as few places as possible. In typical SIMPLIS circuits,
the boundary from analog to digital would be crossed at the analog-to-digital
converters in the design; and the digital-to-analog boundary would
be crossed at the output of the pulse-width modulator (PWM).
- Finally, use logic gates instead of analog switches to implement
digital functionality.