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acmp566 noisey output

Question asked by RossAtkinson on Jul 30, 2012
Latest reply on Oct 23, 2012 by RossAtkinson

Hi I am using a ACMP566 comparator powered by +5v and -5V. The ouputs are terminated to -2V with 50ohms resistors. the input are temained to less than 50ohms.

The input is a 250M signal sinewave type pulse. It is feed to both compaitors. the first comparator the signal is compared with -100mV DC and work fine.

The second is feed via a divide by 2 to the +ve input and a 4ns delayed version of the orginal signal is feed to the -ve input. The output of the comparator is very noisey, why? and how do I improve this,