This geometry gives maximum common mode rejection between the two pairs.
2.
The common-mode rejection ratio is defined as:
3.
The standard measure of this defect is called the common-mode rejection ratio ( denoted CMRR ).
4.
An IC instrumentation amplifier typically contains closely matched laser-trimmed resistors, and therefore offers excellent common-mode rejection.
5.
This common mode rejection is an important benefit of differential signal processing and can be reduced to one in some differential circuit implementations.
6.
Suitable for off-ground measurements to the breakdown voltage of the isolation barrier, and exhibits superb common mode rejection ( > 120 db ).
7.
Suitable for off-ground measurements up to the breakdown voltage of the isolation barrier, and exhibits very good common mode rejection ( 100 db typical ).
8.
In the typical 741 op amp, the common-mode rejection ratio is 90 dB, implying an open-loop common-mode voltage gain of about 6.
9.
The technique has something in common with what electrical engineers call " common-mode rejection, " and is also found in the balanced lines used in audio equipment.
10.
In instrumentation systems, the use of differential inputs with high common mode rejection ratio, to minimise the effects of induced AC signals on the parameter to be measured, is widespread.
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