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引言近代的无线电技术常常要求在很宽的频带内(例如几百兆赫的频宽)进行放大。通常的电子管放大器受到了输入及输出电容的限制。为了比较各种电子管用作宽带放大器的优劣,我们常常采用所谓电子管的优良度Ⅱ这样一种参量.
Introduction Modern radio technologies often require amplification over a wide frequency band (eg, a few hundred megahertz). The usual tube amplifiers suffer from input and output capacitance limitations. In order to compare the advantages and disadvantages of various tubes used as broadband amplifiers, we often use the so-called goodness of the tube Ⅱ such a parameter.