Questions regarding comparator

[hayowazzup]

Hi all,

I would like to ask a few question about regarding opamp as comparator.




1. Why is the High Output Voltage not equal to the Low Output?
2. How can Low Output reach below 10V ?
3. Which parameter in the datasheet gives the info of the Maximum voltage the output can reach up to, with respect to the Vcc?

Thank you

 

[umesh49]

Its depend on comparator. It will always have interal drop out votlage. Look at the data sheet, internal drop output w.r.t. negative rail should be defined less than internal drop out w.r.t positive rail.

 

[keith1200rs]

1. Because most opamps don't have rail-rail outputs. The LM324 is one of them.

2. Because it's a simulation and not necessarily accurate due to the models.

3. Look in the datasheet for 'output voltage range' or 'output voltage swing'. It may also be listed as 'output voltage high' and 'output voltage low'.

Keith