Hi there,
I am struggling with the required circuit design which should latch its output if the signal (from range +/-10VDC) reaches +/-1V (or a certain predefined threshold). I have a circuit showing the unipolar design using voltage comparators but I need this for both signal polarities at the input.

Any idea about how to design the required circuit? It doesn't have to be this particular circuit, any other proposal is also welcome.

Thanks in advance

 

Is this a school/college assignment?

 

Nah. I have an RF phase and magnitude comparator built around AD8302 and would like to implement protection in case that phase difference goes out of 2 deg.
I am thinking about making a full wave precision rectifier before this latching circuit.

 

The LM339 has four independent comparators. So you can create another circuit to sense the negative limit. The comparator outputs are open collector so a wired OR scheme should work.