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LTC6752 imbalanced Duty Cycle

Category: Hardware
Product Number: ltc6752

Hey, 

I'm using LTC6752 comparator 

By inserting the minus input 1v dc

And to the plus input a signal 0.25 and 1.75 volt (so the average voltage is 1)

The signal is at 75MHz

But the signal at the output has an ruined duty cycle 

Approximately 53% &47%

Do you have any solution for this problem?

The problem is solving when I'm changing the average voltage from 1 to other value