Summary:
The solid state DC current sources available on the market are not suitable for applications in low noise measurement systems because of the high level of low-frequency noise introduced in the measurement chain. The most important cause of low-frequency noise in such instruments is the solid state device used as a voltage reference (usually a Zener diode). This problem has been solved, in the instrument described in this paper, by using a new circuit topology in which the solid-state voltage reference has been substituted by a low-noise battery. The instrument, capable of supplying a current as high as 100 mA, is characterized by a low-frequency noise level some orders of magnitude lower than that of similar commercial instrumentation.
Keywords: Batteries, circuit noise, circuit synthesis, current supplies, dc generators, noise.
JCR Impact Factor and WoS quartile: 5,600 - Q1 (2022)
DOI reference:
https://doi.org/10.1109/19.728794
Published on paper: February 1998.
Citation:
C. Ciofi, R. Giannetti, V. Dattilo, B. Neri Ultra low-noise current sources. IEEE Transactions on Instrumentation and Measurement. Vol. 47, nº. 1, pp. 78 - 81, February 1998.
