Noise is a typical problem confronting many isolation applications.Isolation products such as analog isolation amplifiers,optocouplers, transformers and digital couplers, are usedin applications to transmit signals across a high voltagebarrier while providing galvanic separation between twogrounds. Burr-Brown’s isolated analog amplifiers and digitalcouplers use one of three coupling technologies in theirisolation products, each having its own set of advantages anddisadvantages in noisy environments. These technologiesare inductive coupling, capacitive coupling and optical coupling.Isolation amplifiers and digital couplers are used fora variety of applications including breaking of ground loops,motor control, power monitoring and protecting equipmentfrom possible damage. An understanding of the designtechniques used to transmit signals across the isolationbarrier, as well as an understanding of the sources of noise,allows the users to quickly identify design and layout problemsand make appropriate changes to reduce noise totolerable levels.
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