OrCAD PSPICE mixed signal simulation

[vistapoint]

orcad simulation mixed

Hello,

When I tried to control an analog switch with logic circuit output, it shows a strange waveform. It seems the logic ouput only have 1s and 0s. How can I convert that into a specific voltage and drive an analog switch?

Thanks.

 

[papyaki]

dig_prim orcad

Hi,

You can add an open collector stage between the logic signal and the command pin off the analog switch like that :

 

[vistapoint]

mixed signal simulation orcad

The problem is solved in another way. It seems ORCAD-PSPICE can convert digital-analog level automatically. However, how to control the delay associated with each model? I used gates and DFFs from DIG_PRIM library, and I simulated at 1ns clock. It turned out the gates are too slow to responce and I have to slow down. I tried to edit the model but it seems complicated.