A Basic Study on Noise Source Modeling for a Very Low-Level DC Current Amplifier


IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.6   pp.1401-1407
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.6.1401
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Papers Selected from 2004 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2004))
DC amplifier,  negative feedback,  positive feedback,  noise model,  

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For the purpose of analyzing noise characteristics of a very low-level dc current amplifier using a high-ohmage resistor negative feedback circuit, we made some noise sources in the form of the electronic circuit simulation program PSpice with the C language program and simulated transient analyses of the very low-level dc current amplifier using the PSpice. As a result, it was observed that in terms of rise time and increases in the amplitudes of the noise voltage with or without positive feedback circuit, the behavior of output waveform of the simulated equivalent circuit was similar to that of the experimental circuit.