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参数的测量如前节所示,某些参数是按小信号测量的。假定把图3的等效电路用于这些测量。过渡时间T_e 附录中指出,过渡时间与本征的截止频率f_a和外部的“f_T”有关。T_e在一实验室制作的特殊电桥~8上进行测量,如图6所示,此电桥的信号频率为5兆周。
Measurement of parameters As shown in the previous section, some parameters are measured as small signals. It is assumed that the equivalent circuit of Figure 3 is used for these measurements. The transition time T_e indicates in the appendix that the transition time is related to the intrinsic cutoff frequency f_a and the external “f_T”. T_e was measured on a laboratory-made special bridge ~ 8, as shown in Figure 6, where the signal frequency of this bridge was 5 trillion cycles.