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DC measurement errors due to auto-zeroed amplifier noise

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3 Author(s)
F. N. Trofimenkoff ; Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada ; I. G. Finvers ; J. W. Haslett

An empirical fit to the noise voltage source spectrum of an auto-zeroed operational amplifier is used to calculate the variance in the measurement of the amplifier's dc input voltage or its input offset voltage. Convenient closed-form solutions for the variance and hence the normalized standard error are obtained. This allows the selection of the integration time required to achieve a desired accuracy in the measurement of the dc voltage if the low-frequency noise plateau is known or to measure the low-frequency noise plateau using a simple circuit and dc voltage measurements

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:45 ,  Issue: 1 )