Amplifiers used in analog signal conditioning circuits are usually protected against electromagnetic interference (EMI) by means of filters placed at the PCB level. The literature is plenty of solutions aimed at keeping filters' attenuation as high as possible in the widest possible frequency range, but actually such filters are less effective than expected because of the parasitic elements introduced by interconnects, therefore EMI can be propagated into ICs causing temporary or definitive operation failures. This can be avoided inserting EMI filters at the IC level and/or using circuit topologies intrinsically immune to EMI. This paper shows that the immunity to RFI of analog circuits based on feedback opamps is significantly improved if input signals are chopped before being amplified.

An analog front end based on chopped signals highly immune to RFI / Fiori, Franco. - STAMPA. - (2015), pp. 98-101. (Intervento presentato al convegno Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2015 tenutosi a Taipei (TWN) nel may 2015) [10.1109/APEMC.2015.7175381].

An analog front end based on chopped signals highly immune to RFI

FIORI, Franco
2015

Abstract

Amplifiers used in analog signal conditioning circuits are usually protected against electromagnetic interference (EMI) by means of filters placed at the PCB level. The literature is plenty of solutions aimed at keeping filters' attenuation as high as possible in the widest possible frequency range, but actually such filters are less effective than expected because of the parasitic elements introduced by interconnects, therefore EMI can be propagated into ICs causing temporary or definitive operation failures. This can be avoided inserting EMI filters at the IC level and/or using circuit topologies intrinsically immune to EMI. This paper shows that the immunity to RFI of analog circuits based on feedback opamps is significantly improved if input signals are chopped before being amplified.
2015
978-1-4799-6668-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2626940
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