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本文介绍了一种改进的稳定宽频带交直流变换器。它主要由一孪生结型场效应管和一只低漂移运算放大器组成。具有稳定的平方律传输特性。当频率高达200兆赫、输出为0～0.5V时,其飘移小于0.1毫伏/小时,输入电容为6～10P~F,输入电导很小可不计。这种变换器还可作为两交流输入讯号的良好平衡差动变换器来使用。结合采用一些温度补偿技术,其温度系数可降到-O.1%/℃以下。
This article describes an improved stable wideband AC-DC converter. It is mainly composed of a twin junction field effect transistor and a low-drift op amp. Has a stable square law transmission characteristics. When the frequency of up to 200 MHz, the output is 0 ~ 0.5V, the drift is less than 0.1 mV / h, the input capacitance of 6 ~ 10P ~ F, the input conductance is small can be ignored. This converter can also be used as a good balance of two AC input signal differential transformer. Combined with some temperature compensation techniques, the temperature coefficient can be reduced to below -0.1% / ° C.