What is the CMRR in decibels (dB) for a typical 741C op-amp? Given the typical open-loop differential gain for the 741C is 200,000 and the typical commonmode gain is 6.3.
The Common Mode Rejection Ratio (CMRR) is defined as the ratio of the differential gain to the common-mode gain.
CMRR = Differential gain / Common-mode gain
CMRR = 200,000 / 6.3
CMRR = 31,746
To express this value in decibels (dB), we can use the formula:
CMRR(dB) = 20log10(CMRR)
CMRR(dB) = 20log10(31,746)
CMRR(dB) = 90.2 dB
Therefore, the CMRR of a typical 741C op-amp is approximately 90.2 dB.
To calculate the Common Mode Rejection Ratio (CMRR) in decibels (dB) for a typical 741C op-amp, you can use the following formula:
CMRR (dB) = 20 * log10 (differential gain / common-mode gain)
Given that the typical open-loop differential gain for the 741C is 200,000 and the typical common-mode gain is 6.3, we can substitute these values into the formula:
CMRR (dB) = 20 * log10 (200,000 / 6.3)
Now let's calculate the CMRR:
CMRR (dB) = 20 * log10 (31,746.03)
Using a calculator to compute the logarithm:
CMRR (dB) ≈ 20 * 4.5
CMRR (dB) ≈ 90 dB
Therefore, the CMRR of a typical 741C op-amp is approximately 90 decibels (dB).