sheldon wrote on Jul 17th, 2006, 12:06am: sorry, i haven't describe my specs in detail. my comparator is used in a chip. and it used to compare with a reference voltage. i need this compatator should "one side" hysteresis. it means when input rises from low to hign the switching point should equals reference voltage just like a normal comparator, while from high to low the hysteresis should take effect.
for getting "one side hys", i use a MOS switch. but this swtich will intruduce Ron which will vary with supply,Temp,and processes. so if using the resistor positive feedback, comparator will suffer from those. and need more area in my chip.