about comparator simulation(Ioh,Vol)

[holddreams]

https://www.st.com/stonline/products/literature/ds/4065.pdf

The above is a comparator datasheet.

I have some questions:

1.on page 3, There are two parameters:IOH,VOL,
Anyone can tell me how to simulation these two parameters?
And why not VOH,VOL? or why not IOH,IOL?

2.for a camparator circuit,phase margin is necessary or not?I think phase margin only in feedback circuit.


Thanks.

 

[gajen]

Apply input voltage difference between true and complement of +1V and apply 3V at output. Then measure current sink inside the circuit. This will give IOH

Similarly apply negative input voltage and supply a 6mA current to the output pin, and measure the voltage on output node. This will give VOL.

From application diagram this is only nmos driven and you cannot drive a high voltage from this circuit. So VOH cannot be defined here. But IOL can be defined for this circuit for a particular voltage driven at the output.

 

[holddreams]

Thanks a lot!