Demodulation of Radio Frequency Interference in CMOS Operational Amplifiers

Franco FIORI  Paolo S. CROVETTI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.11   pp.2309-2319
Publication Date: 2003/11/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
operational amplifier,  harmonic distortion,  Volterra series,  radio frequency interference,  electromagnetic interference (EMI),  

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Summary: 
In this paper a second order Volterra series model of an operational amplifier (opamp) circuit is presented. Such a model is suitable to the investigation of the rectification and demodulation effects of radio frequency (RF) interference superimposed on the nominal input signals and on the power supply voltage of an opamp. On the basis of the new model, some design criteria to improve the immunity of opamps to RF interference are proposed. Model predictions are verified by comparison with experimental test results.