How to implement the hysteresis of comparator

[tia_design]

Hi,

I'm going to design a continuous time comparator using non-compensated op amp. So, how to implemented hysteresis for this comparator. Remember the op amp itself will have some offset. Thanks!

 

[swicap]

dc sweep

 

[DenisMark]

1)Use small current sources in parallel with diff. pairs load. Switch between them thought MOS switches in dependence of output state.
2) Another kind of circuit u can see at the attached picture

 

[jluhzw]

Yes , DenisMark's ideas is good. The first one is so easy to finished.
You can set the size ratio of the M3 to M10 to set the hysteresis.Please refer the Allen' s book for the more information.