Orcad simulation problem

[DimaA]

orcad mixed analog/digital

I'm trying to simulate a simple frequency divider by usinf D-Flip-Flop, but I get strange output. I guess the simulator doesn't know the initial state of flip-flop. Is there a way to solve the problem?

 

[papyaki]

options simulations settings orcad

Hi,

You need to disconnect CLR pin from +5vdc and connect it to a reset signal. This reset can be another STIM source which is at 0 for several microsecond and then goes to 1 for the rest of the time.

 

[Karthikeya]

in toolbars ->power pins ....u can find 'high' and 'low' pins.
use these to insert a high or a low digital input for simulation
or use STIM .................

regards

 

[Jack// ani]

No analog power supply is used in digital circuit. Put HI/LOW ports instead!! And for simulation setting window you have to initialize the state of the flip flop.

Hope this helps

 

[DimaA]

And for simulation setting window you have to initialize the state of the flip flop.

How exactly I do it? I didn't find such an option in simulation settings window

 

[Jack// ani]

Hope you will understand everything after looking at this.......

 

[papyaki]

Hi,

This also works fine, by using mixed analog/digital simulation. Dont forget to set IC = 0V in C1's parameters

 

[tomanorbi]

Go to the Simulation Settings-Options and click to Gate-level Simulation and Initialize all flip-flops to 0 or 1. This setting you have to do.