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采用前置微电流放大器和可编程增益放大器两级运放,实现电离规离子流的可编程增益放大,以满足在真空度迅速变化且动态范围较宽时对真空度的快速准确测量。介绍了微弱电流信号的放大原理、器件选择原则、单片机控制可编程增益放大器的实现方法、电路抗干扰措施等,并给出了部分测试结果。本文设计的电离规离子流放大电路具有增益动态范围宽、精度高、响应速度快等优点,为托卡马克装置的真空度快速测量系统中离子流测量电路提供了设计参考。
A preamplifier and a programmable gain amplifier are used to amplify the programmable gain of the ionization ion flow to meet the rapid and accurate measurement of the degree of vacuum when the degree of vacuum changes rapidly and the dynamic range is wide. Introduced the weak current signal amplification principle, the principle of device selection, SCM programmable gain amplifier implementation methods, circuit anti-interference measures, and gives some of the test results. In this paper, the design of ionization ion current amplification circuit with gain wide dynamic range, high precision, fast response, etc., for the tokamak device rapid measurement of vacuum ion current measurement circuit provides a reference design.