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A: Most op amp feature a 90 Db noise ratio rejection. For a 741c it varies from 70 to 90 Db ideally the bigger the number the better.

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Why it is desirable for an op amp to have a high CMRR?

A high CMRR prevents the opamp from passing undesirable common mode signals.


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CMRR is common mode rejection ratio. it is the ratio of Differential gain to common mode gain. CMRR=Ad/Ac


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Decibel (dB) is a unit for expressing the Common-Mode Rejection Ratio (CMRR) because CMRR is typically expressed in terms of the logarithm of the ratio of the common-mode input voltage to the differential mode input voltage. Using decibels allows for easier comparison and understanding of the CMRR values, especially since CMRR values can span a wide range. It also simplifies calculations involving CMRR.


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Why is the unit of CMRR?

pseudo