Hello,
I'm working on a project for the school, and my teacher want from me to use a real comparator instead of an OpAmp.
This comparator is LT1011 and it's use like an hysteresis non inverting comparator. So for me there is 2 thresholds.
I make a simulation on Ltspice (link down) to try to understand it but with not a good result.
That is the schema that my teacher is using. I calculated the 2 thresholds value and it was +/- 0,9V. But on the simulation that is not correct :
It is more like that we have only 1 threshold and i don't understand why.
Also, it goes only bewteen 0/9V, normally, it will goes to +/-9V...
By te way, the R3 resistance is a pull up resistor cuz the output of the comparator can just generate a 0.
If I compare the same value with an OpAmp, i got this :
We have clearly 2 thresholds here, so that's not a problem of value...
I did check the datasheet of the comparator, but it doesn't help me a lot...
Hope someone do know why
Chris
I'm working on a project for the school, and my teacher want from me to use a real comparator instead of an OpAmp.
This comparator is LT1011 and it's use like an hysteresis non inverting comparator. So for me there is 2 thresholds.
I make a simulation on Ltspice (link down) to try to understand it but with not a good result.
That is the schema that my teacher is using. I calculated the 2 thresholds value and it was +/- 0,9V. But on the simulation that is not correct :
It is more like that we have only 1 threshold and i don't understand why.
Also, it goes only bewteen 0/9V, normally, it will goes to +/-9V...
By te way, the R3 resistance is a pull up resistor cuz the output of the comparator can just generate a 0.
If I compare the same value with an OpAmp, i got this :
We have clearly 2 thresholds here, so that's not a problem of value...
I did check the datasheet of the comparator, but it doesn't help me a lot...
Hope someone do know why
Chris
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