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在放大电子管的阴极电路中,如图1所示,通常串连一固定电阻R_k以获得自给偏压.为了避免因接入R_k产生负反馈而降低放大器的增益,必须在该电阻两端并连一旁路电容器C_k,以减小阴极电路的交流阻抗.此时C_k的容纳2πfC_k应满足不等式 2πfC_k≥(2～3)S_(dk);(1) 其中S_(dk)是放大管的阴极动态互导率.通常三极管的S_(dk)比静态互导率S小2～3倍,而五极管的
In the cathode of the amplifier tube, a fixed resistor R_k is usually connected in series to obtain a self-bias voltage as shown in Fig. 1. In order to avoid reducing the gain of the amplifier due to the negative feedback generated by the access R_k, it must be connected at both ends of the resistor A bypass capacitor C_k, to reduce the AC impedance of the cathode circuit. At this time C_k accommodation 2πfC_k should meet the inequality 2πfC_k ≥ (2 ~ 3) S_ (dk); (1) where S_ (dk) Conductivity. Transistor usually S_ (dk) than the static mutual conductivity S small 2 to 3 times, and the pentode