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Why is resistor needed in ADC circuit

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This figure shows an ADC.

My question: Why there is resistor (R) connecting to inverting pin of each OPAMP.

Are they really necessary? In my opinion, they can be removed because you will have to compare the
voltage at non-inverting pin to the voltage at inverting pin anyway. And that is enough for converting
analog Vin to digital signal.

So what’s the point for having those resistors?

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