what does this F means in Digital output

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root2hell

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i am performing an OR operation on two waveforms shown in attached image.
but i am getting "F" on falling edge.
why is this happening.
and how to overcome this problem.
 

I think, you should have reviewed the PSpice reference, chapter about digital devices first.

"F" means falling edge. If it's a problem depends on your usage of the circuit.
 
Slow edge (slow rise- and fall-time) would be my description of the red waveform in your original post.
 

You don't need to remove the low-pass, but you shouldn't send the low-pass filtered signal to a digital gate. Or if you do, you must be aware of unpredictable output signals.
 

OR'ing these two analog signals into a HC logic device simply delays the falling (F) edge only.

However if any ripple exists it will be amplified and may cause multiple transitions on the falling edge.

What is the intent?
 

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