Why is the CMRR of an op amp is-amp defined in such a way?

Why is the CMRRCMRR of an op amp-amp defined as \$20\log(A_d/A_c)\$?

I know that the value of \$A_d\$ is far greater than \$A_c\$, so we take the log, but why we are we multiplying 20 with it?

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edited Sep 8, 2015 at 16:20

Why CMRR of an OPAMPop amp is defined in such a way?

Why is the CMRR of an OPAMP isop amp defined as 20log(Ad/Ac)\$20\log(A_d/A_c)\$?

I know that the value of Ad\$A_d\$ is far greater tha Acthan \$A_c\$, so we take the log , but why we are multiplying 20 with it?

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Why CMRR of an OPAMP is defined as 20log(Ad/Ac)?

I know that the value of Ad is far greater tha Ac , so we take the log , but why we are multiplying 20 with it?

`

Why is the CMRR of an op amp defined as \$20\log(A_d/A_c)\$?

I know that the value of \$A_d\$ is far greater than \$A_c\$, so we take the log, but why we are multiplying 20 with it?

Source Link

asked Sep 8, 2015 at 15:59

Why CMRR of an OPAMP is defined as 20log(Ad/Ac)?

I know that the value of Ad is far greater tha Ac , so we take the log , but why we are multiplying 20 with it?

`

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