Full Model and Characterization of Noise in Operational Amplifier

Author

Giusi, Gino ; Crupi, Felice ; Pace, Calogero ; Magnone, Paolo

Author_Institution

Dipt. di Elettron., Inf. e Sist., Univ. of Calabria, Rende

Volume

56

Issue

1

fYear

2009

Firstpage

97

Lastpage

102

Abstract

In this paper, we propose a method to fully characterize noise in operational amplifiers (op-amps). The method allows the extraction not only of the spectra of the equivalent input current noise (EICN) and equivalent input voltage noise generators but also of their cross-correlation coefficients, which are routinely discarded in noise analysis of op-amps. The method is applied to extract all noise parameters of the low-noise bipolar-input op-amp OP27 and is validated through noise measurements in a test circuit. A key finding is that neglecting the cross-correlation coefficient between the two EICN generators can lead to severe errors in noise analysis.

Keywords

electric noise measurement; equivalent circuits; noise generators; operational amplifiers; EICN spectra; cross-correlation coefficients; equivalent input current noise; equivalent input voltage noise generator; low-noise bipolar-input op-amp OP27; noise analysis; noise measurement; op-amp noise characterization; operational amplifier noise model; test circuit; Circuit noise; Circuit testing; Error analysis; Integrated circuit modeling; Integrated circuit noise; Low-noise amplifiers; Noise generators; Noise measurement; Operational amplifiers; Voltage; Cross correlation; noise measurements; noise model; operational amplifiers (op-amps);

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2008.927011

Filename

4774065