At this time, I would like to analyze the performance of the LM2903B-Q1.
I did some manual calculations and simulations (with SIMetrix) to make sure the simulation result.
To make the context, I try to simulate the comparator with V input range from 1 [V] to 32 [V] and this graph show the duty cycle (%) in every 1 [V] differences.
However, the results are quite different. I get linear correlation from manual calculation but for simulation is a linear type but with step value.
for example:
| V input | Manual Calculation duty cycle | Simulation duty cycle |
| 11 [V] | 39.18% | 44% |
| 12 [V] | 40.93% | 44% |
| 13 [V] | 42.69% | 44% |
| 14 [V] | 44.44% | 44% |
| 15 [V] | 46.19% | 44% |
| 16 [V] | 47.95% | 50% |
| 17 [V] | 49.70% | 50% |
| 18 [V] | 51.45% | 56% |
| 19 [V] | 53.20% | 56% |
| 20 [V] | 54.96% | 56% |
| 21 [V] | 56.71% | 56% |
Although the results have the same behavior (same gradient) I want to know the cause, do you familiar what the factors affect the simulation results? Why the simulation result is step value instead of linear?
green line: simulation result
orange line: manual calculation
Thank you in advance
