Modeling of EMI propagation in switched-capacitor ΣΔ A/D converter

Author

Cristaldi, David J R ; Giustolisi, Gianluca

Author_Institution

DIEES, Univ. di Catania, Catania

fYear

2008

fDate

Aug. 31 2008-Sept. 3 2008

Firstpage

1241

Lastpage

1244

Abstract

In this communication a model of the propagation of electromagnetic interference (EMI) in sigma-delta A/D converters is developed. After a discussion about the EMI injection points, the model takes into consideration EMI injected into the feedback path and coming from the voltage reference circuit. The model reveals that EMI are demodulated, thanks to a multiplication with the output signal, and, under certain circumstances, may fall into the baseband thus affecting the overall signal-to-noise ratio (SNR) and the precision of the A/D converter. The model is validated by means of simulation and excellent agreement is obtained between expected data and simulation results.

Keywords

electromagnetic interference; sigma-delta modulation; switched capacitor networks; EMI propagation; electromagnetic interference; sigma-delta A/D converters; signal-to-noise ratio; switched-capacitor SigmaDelta A/D converter; voltage reference circuit; Baseband; Communication switching; Delta-sigma modulation; Electromagnetic interference; Electromagnetic modeling; Electromagnetic propagation; Feedback circuits; Signal to noise ratio; Switching converters; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2008. ICECS 2008. 15th IEEE International Conference on

Conference_Location

St. Julien´s

Print_ISBN

978-1-4244-2181-7

Electronic_ISBN

978-1-4244-2182-4

Type

conf

DOI

10.1109/ICECS.2008.4675084

Filename

4675084