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Special Purpose Amplifiers

An instrumentation amplifier (IA) is a differential voltagegain device that amplifies the difference between the voltages existing at its two input terminals. The main purpose is to amplify small signals that may be riding on large common-mode voltages. It is an integrated circuit that internally has three operational amplifiers and several resistors. The key characteristics are high input impedance, high common-mode rejection, low output offset, and low output impedance. Instrumentation amplifiers are commonly used in environments with high common mode noise such as in data acquisition systems where remote sensing of input variables is required

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