[SOLVED] Hysteresis Comparator .TRAN and .DC simulations results not exactly equal? why?

[allennlowaton]

Good day guys.
I made a simulations (.TRAN and .DC) of the hysteresis comparator.
The results are shown below:

Transient: (VHL-VLH) = 283mV
DC : (VHL-VLH) = 250mV



The question now, what happened to the 33mV? Where it come from?

Any idea please. Thank you

 

[LvW]

Try another speed of the triangle during transient simulation - and you will most probably see a voltage difference even other than 283 mV. The reason is that during Tran analysis all time dependent elements (in particular: capacitances) are considered - opposite to the dc analysis. Thus, all delay effects of the realistic amplifier model influence the comparator response.

 

[allennlowaton]

I tried to simulate with a faster triangular wave and indeed, it produces a wider hysteresis value. Thank you LvW...