Community PCB Design & IC Packaging (Allegro X) PSpice Digital vs. Analog Implementation in PSPICE

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Digital vs. Analog Implementation in PSPICE

jconradTI

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?

Thanks,

Joseph

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  • +1

    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.

Reply
  • +1

    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.

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