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对电子管超高频特性的详细计算和测量可证明,在工作频率较高而接近于输入电路的自然谐振频率时,管的有效输入电容随频率的增加而增加,这一效应使较宽通频带的分布放大器的实际截止频率低于原设计的截止频率,而且这一情况随设计频宽增加而愈益严重。本文提出一种新的利用mm′低通网络作为栅极和板极传输线的分布放大级。mm′网络可以较好地吸收电子管的杂散参数而使放大级实际的和设计的截止频率相符合。文中对这种放大级的特性进行了分析并给出截止频率为200和300MHz的分布放大级的实验结果。在制作较宽频带的分布放大器时应用mm′放大级可以简化设计手续。
Detailed calculations and measurements of the UHF characteristics of the tube demonstrate that the effective input capacitance of the tube increases with increasing frequency at high operating frequencies close to the natural resonant frequency of the input circuit, The actual cut-off frequency of the amplifier is lower than the cut-off frequency of the original design, and this situation becomes more and more serious as the design bandwidth increases. In this paper, a new distributed amplification stage using mm ’low-pass network as gate and plate transmission line is proposed. mm ’network can better absorb the stray tube parameters to make the amplifier stage and design of the actual cut-off frequency match. In this paper, the characteristics of this amplifier stage are analyzed and experimental results of distributed amplifier stages with cutoff frequencies of 200 and 300MHz are given. The use of mm ’amplification stages in the fabrication of wideband distribution amplifiers simplifies design.