Electrical Engineering

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme

the differential amplifier is substracting an input with a delayed input and outputing a tiny difference to the integrator and that is confusing. So as mentioned in the title, how does the differential amplifier behave or whats is its role?

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What is the role of the differential amplifier in a delta sigma converter?

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