Van Driessche W, Lindemann B
Laboratorium voor Fysiologie, Universiteit te Leuven, BelgiumAbteilung fur Membranforschung an Epithelien, Second Department of Physiology, D6650 Homburg, West Germany.
Rev Sci Instrum. 1978 Jan;49(1):52. doi: 10.1063/1.1135251.
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.
描述了两款为上皮组织中的电压和电流波动测量而设计的低噪声差分输入放大器。第一款使用一对匹配的低噪声晶体管，特别适用于青蛙皮肤及其他阻抗低于1千欧的标本中的低频电流和电压噪声测量。第二款围绕一对匹配的结型场效应晶体管（JFET）设计，也可用于更高的源阻抗。通过使用晶体管输入级从青蛙皮肤获得的Na(+)电流功率密度谱展示了其性能。
