I am really confused between two parameters in the comparator. The Propagation delay and the Response time.
I understand that the Propagation delay is the delay from input to output of a digital gate switch and the Response time is how quickly a comparator changes output based on an input change.
But I don't know which parameter I have to take into consideration when I choose particular comparator given that my input signal has frequency of 500 MHz.
knowing that not all comparators datasheets provide both parameters value.
Is the 500MHz signal digital or analog (sinewave)? Generally you would want the response/delay time to be less than 1/2 the cycle period or 1ns for a 500MHz signal. That requires a very fast comparator.
That's correct. Response time, however, is the time, which is necessary for an input signal to stay in an input range, which logically would cause an output change. I.e. the time necessary to accept such change. Usually shorter than the prop. delay time.