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kahei
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What is the use of Difference and Instrumentation Amplifier?
http://en.wikipedia.org/wiki/Instrumentation_amplifier"An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with input buffers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment.
A difference amplifier is a type of operational amplifier (op-amp) circuit that amplifies the difference between two input signals. An instrumentation amplifier is a more specialized type of difference amplifier that has additional features to improve accuracy and reduce noise in measurement applications.
Instrumentation amplifiers typically have higher common mode rejection ratio (CMRR), lower input offset voltage, and better stability compared to difference amplifiers. This makes them more suitable for precise measurement and data acquisition systems.
An instrumentation amplifier typically consists of three op-amps and a few precision resistors. The first op-amp amplifies the difference between the two input signals, while the second op-amp buffers this signal and adds gain. The third op-amp is used as a feedback loop to adjust the gain and ensure high CMRR.
Both types of amplifiers are commonly used in precision measurement and data acquisition systems, sensor signal conditioning, and medical equipment. They are also used in audio and communication systems for noise reduction and signal amplification.
If you require high accuracy and precision in your measurements, an instrumentation amplifier would be the better choice. However, if your application does not require such high precision, a difference amplifier may be sufficient and more cost-effective.