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Accurate and detailed noise calculations for operational amplifier circuits using MATLAB are proposed. The analysis of the basic op amp circuits (inverting, non-inverting and differential circuits) is performed taking into account the specifics of current and voltage amplifiers. The MATLAB function m-files are developed to predict the noise. The following characteristics are calculated: total output spot noise voltage; total equivalent input spot noise voltage; noise power; integrated noise with its two components, 1/f noise voltage and equivalent white noise voltage; noise figure. Data sheets are only needed to use programs for the particular circuit configuration. The results are verified with the PSpice simulator. The proposed MATLAB noise functions give the possibility of investigating the noise behavior of the basic analog blocks, which are characterized by accuracy and simplicity.
Date of Conference: 13-16 May 2004