Do digital components/signals simulate faster than analog in PSPICE?
I'm asking because I have typically seen digital blocks implemented using analog functionality. For example, a digital block is still treated as analog signal by using a behavioral model to implement AND, BUF, INV, etc.
Trying to model a switching power supply (control loop and all) and typically there is a long simulation time, which is mostly due to the switching nature and small-time step needed. If I changed the implementation of the digital blocks so PSPICE treats them as true digital signals, would this speed up simulation time?
Digital blocks are implemented using analog functionality because it gives you a flexibility to parameterize output levels and delays. However in your case if you have switching power supply with a loopback modelled as digital, it may not help to speed up the simulation time. This may take care of few digital gates like AND,BUF etc but this will still involve A/D(input side of power supply) and D/A conversions, also the switching nature and small step size will be required. These factors will again lead to a longer simulation time.
Hope this helps.