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instrumentation amplifier |
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instrumentation amplifier [‚in·strə·men′tā·shən ′am·plə‚fī·ər]
(electronics) An amplifier that accepts a voltage signal as an input and produces a linearly scaled version of this signal at the output; it is a closed-loop fixed-gain amplifier, usually differential, and has high input impedance, low drift, and high common-mode rejection over a wide range of frequencies. Instrumentation amplifier A special-purpose linear amplifier, used for the accurate amplification of the difference between two (often small) voltages, often in the presence of much larger common-mode voltages, and having a pair of differential (usually high-impedance) input terminals, connected to sources Vin1 and Vin2; a well-defined differential-mode gain ADM; and a voltage output Vout, satisfying the relationship given in the equation below. It ![]() Instrumentation amplifiers are used to interface low-level devices, such as strain gages, pressure transducers, and Hall-effect magnetic sensors, into a subsequent high-level process, such as analog-to-digital conversion. See Amplifier, Differential amplifier, Pressure transducer, Strain gage How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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