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.
A practical opamp is designed to approach the characteristics of the ideal opamp as closely as possible. The open loop voltage gain of an ideal opamp is infinite, so while this is actually impossible to achieve practical opamps are built with as high an open loop voltage gain as possible.
CMRR
741 opamp
An opamp buffer circuit is one where the input signal is connected to the plus input, and the output is connected to the minus input. Within the performance limitations of the opamp, the output will track the input. The advantage of the buffer circuit is that is presents very little load impedance to the input signal, while providing a low impedance from the output to drive whatever circuitry is connected there.
Possibly Linear, in which case it means analog. The LM324 is an opamp.
A high CMRR prevents the opamp from passing undesirable common mode signals.
CMRR is common mode rejection ratio. it is the ratio of Differential gain to common mode gain. CMRR=Ad/Ac
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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A comparator is simply an opamp with a certain configuation of external circuitry ( a few components) that make it function as a comparator.
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