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valkas [14]
3 years ago
9

An OP AMP has CMRR = 100 dB and open-loop gain =250000. Determine the common mode gain ACM

Physics
1 answer:
Lera25 [3.4K]3 years ago
4 0

Answer:

ACM = 2.5

Explanation:

The common mode rejection ratio, is a parameter that is used to measure the ability of an Operational-Amplifier, to reject or eliminate the noises of same polarity. The common mode rejection ratio is given by the following formula:

CMMR = AV/ACM

for the value of CMMR in deciBels (dB), the formula becomes:

CMMR = 20 log(AV/ACM)

where,

CMMR = Common Mode Rejection Ratio = 100 dB

AV = Open Loop Gain = 250000

ACM = Common Mode Gain = ?

Therefore,

100  = 20 log (250000/ACM)

100/20 = log (250000/ACM)

10⁵ = 250000/ACM

ACM = 250000/10⁵

<u>ACM = 2.5</u>

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--------

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