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adding delay element to circuit

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I want to delay my signal by 1.5 ~ 2 nano second i tried to use two inverters but its doesn't give me large delay as i want.

The reason why i want to add delay

Im building receiver system and extracting clock using CDR to use it in the ADC

My eye diagram is wide open around 5 nano second but the rising edge of the extracted clock is at multiples of 3 nano seconds.

so i want delay the extracted clock by 1.5 ~ 2 nano seconds without affecting my clock

Eye diagram

extracted clock 


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