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记录单个生物细胞电活动的微电极技术正在迅速发展,要求生物电放大器相应发展,本文描述为此设计的一个新型放大器.由于采用辨差迭联电路和整个放大器的深度负反馈,放大器的主要性能如下:输入阻抗-10~(11)欧并联1微微法(最佳补偿时),辨差率大于10~4,漂移200微伏/30分,频率响应为0——200千赫(-2分贝),栅流小于2×10~(-12)安.由于上述特点,本放大器的性能优于国际上通用的所谓“电生理实验用阴极输出器”.本放大器在我所生物实验室中使用了三年多,实践证明它工作稳定,性能良好.
Microelectrode technology, which records the electrical activity of a single biological cell, is rapidly evolving, requiring a corresponding development of the bioelectric amplifier. This article describes a new amplifier designed for this purpose. Due to the deep negative feedback of the differential amplifier and the entire amplifier, the main performance of the amplifier As follows: input impedance -10 ~ (11) European parallel 1 pico-law (best compensation), the resolution is greater than 10 ~ 4, drift 200 microvolts / 30 minutes, the frequency response is 0-200 KHz Decibel), the gate current is less than 2 × 10 ~ (-12) Ann.Because of the above characteristics, the performance of the amplifier is better than the international so-called “electrophysiological experiments with the cathode output device.” The amplifier in my biological experiment Room used for more than three years, the practice has proved that it is stable, good performance.