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为了提高直流放大器的稳定性,目前多采用变流的方法。变流装置中以振动子用得較多。无論在高輸入阻抗及低輸入阻抗的放大器中应用振动子变流都能获得較好的效果。我們对振子式高輸入阻抗直流放大器进行了一些研究,要求能測量的极限灵敏度达到10~(-12)安培。在本文中首先分析了国产振动子在高输入阻抗下各种干扰电压的来源、測試及其消除的方法。列举出整套直流放大器的試驗結果,基本上可达到10~(-12)安培的灵敏度,并指出适当改变输入回路的参数还可提高放大器的灵敏度,最后采用負反饋的方法来提高放大器的稳定度。
In order to improve the stability of the DC amplifier, the current use of variable current method. In the converter device to use more vibrators. In both the high input impedance and low input impedance of the amplifier in the application of vibrating converter can get better results. We conducted some research on the oscillator-type high input impedance DC amplifier and required that the ultimate sensitivity of the measurement should be 10 ~ (-12) Amperes. In this paper, firstly, the sources, tests and elimination of various interference voltages of domestic vibrators under high input impedance are analyzed. The experimental results of the whole set of DC amplifier are listed, and the sensitivity of 10 ~ (-12) Amperes can be basically achieved. It is pointed out that changing the parameters of the input circuit properly can increase the sensitivity of the amplifier. Finally, the negative feedback method is adopted to improve the stability of the amplifier .