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Article: IAs pull low-level signals out of noisy environments. (Instrumentation amplifiers) (Technology Update) (technical)
- Article from:
- EDN
- Article date:
- September 1, 1988
- Author:
CopyrightCOPYRIGHT 1988 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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IAs pull low-level signals out of noisy environments Unwanted noise can contaminate electronic signals and complicate their acquisition in various ways, so if you need to acquire a differential signal that is mixed with unwanted common-mode noise and voltage, consider using instrumentation amplifiers (IAs). They are high-gain dc-coupled differential amplifiers characterized by three traits: a single-ended output, high input impedance, and high common-mode rejection (CMR). Generally designers use these devices to amplify small differential signals coming from transducers that may generate large common-mode signals (Ref 1).
Fig 1 shows the noise sources that can ...