4-bit Flash ADC LSB Error

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SimpleKCLSimpleKVL

Joined Mar 3, 2019
11
Hello,

I am working on 4-bit Flash ADC which has 1 GS/s and 0 - 1.2 V reference voltage. Comparator of the adc is two-stage op-amp, its gain is around 80 dB. As you can see on the graph attached, I gave ramp function from the input, first comparator doesn't give high output properly. I tried to change design parameters of the comparator but I couldn't cope with it. Could you please tell what should I change ? Thank you in advance.
 

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