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. 1978 Jan;49(1):52.
doi: 10.1063/1.1135251.

Low-noise amplification of voltage and current fluctuations arising in epithelia

W Van Driessche  1 , B Lindemann
Affiliations

Low-noise amplification of voltage and current fluctuations arising in epithelia

W Van Driessche et al. Rev Sci Instrum. 1978 Jan.

Abstract

Two low-noise differential input amplifiers designed for voltage and current fluctuation measurements in epithelia are described. The first one uses a matched pair of low-noise transistors and is particularly suited for low-frequency current and voltage noise measurements in frog skin and other preparations with impedances below 1 kOmega. The second one is designed around a matched pair of JFETs and can also be used for higher source impedance. Performance is demonstrated with Na(+) current power density spectra obtained from frog skin with the transistor-input stage.

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