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离子选择性微电极是测量生物细胞中离子活度的新型工具。近年来,已研制成了多种离子的PVC液膜微电极。微电极的尖端直径小至1微米,甚至0.1微米,电极的内阻高达10~(11)Ω以上。因此需要非常良好的绝缘及高输入阻抗的测试仪器。国产FW-1型微电极放大器的输入阻抗为10~(12)Ω,还不能同10~(10)Ω以上的微电极配合使用。为了提高微电极的测量精度,本工作研制了微电极阻抗转换器。该转换器的输入阻抗为10~(14)Ω,输出阻抗小于1Ω。设计中采用特殊的电源自举电路,使工作电压浮动,大辐度提高了输入
Ion-selective microelectrodes are new tools for measuring ion activity in biological cells. In recent years, has developed a variety of ions of PVC liquid film microelectrode. Microelectrode tip diameter as small as 1 micron, or even 0.1 microns, the electrode resistance as high as 10 ~ (11) Ω. This requires very good insulation and high input impedance test equipment. Domestic FW-1 type micro-electrode amplifier input impedance of 10 ~ (12) Ω, can not be used with the 10 ~ (10) Ω above the microelectrode. In order to improve the measurement accuracy of the microelectrode, this work developed a microelectrode impedance converter. The converter input impedance of 10 ~ (14) Ω, the output impedance is less than 1Ω. The design uses a special power bootstrap circuit, so that the operating voltage fluctuations, high-intensity input increased