hysteresis of latch comparator?

[melodyseu]

comparator latch

Hi everybody
How to realize hysteresis to a latch comparator? Any good methord or any good paper are welcome

Thanks very much!

 

[niezimei]

latch comparator

add hysteresis to the pre-amplify stage.

 

[liuyonggen_1]

latch hysteresis circuit

In general, there are two ways to reach hysterises
the first approach is using a one-stage comparator ,Allen's book give an example.
the second is you can use a one or two stage comparator followed by a smitter.

 

[fanrong]

hysteresis in a comparator

Make positive feedback loop .
Positive feedback is needed if your want hysterysis .

 

[melodyseu]

latching comparator

Thank you very much for your kind suggestions
But is there anyway to add hysteresis to the latch stage, for example the latch in the figure below?

 

[liuyonggen_1]

hysteresis latch circuit

try to make the width-length ratio of M9 and m10 different.
two tips to form a hysteresis:
the first is positive feedback.
the second is that the circuits for two cases(vp>vn and vp<vn) are different.

 

[yellff]

latch hysteresis

But I think a latch comparator with a good preamplifer stage,then it is not a
hystersis comparator,it is q high speed comparator