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A differential amplifier amplifies the difference signal between its two inputs, while rejecting the common mode signal that might be present relative to circuit ground. Operational amplifiers are great for this purpose. With a sufficiently high open loop gain, the Comon Mode Rejection Ratio (CMRR) is excellent. This is done to reject the common mode voltage that is developed in the signal cable, a twisted-pair cable, often caused by noise or AC current in the vicinity of the cable run. Applications include differential microphones, reducing hum, or small signal sensor monitors, often over a large distance such as in a process control application. The differential amplifier is also much easier to setup for a specific gain, as well as to setup for a particular frequency response, because its input impedance is so high, and because its bridge mode operation is very easy to use.

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