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1 多β晶体管与线性与或门在开发高速硅集成电路的努力中,人们把注意力放在双极型集成电路上.双极型晶体管不仅由于其结电容较小而适合于高速工作,而且pn结的单向导通特性赋予它的发射结具有很强的逻辑功能.例如,TTL电路中的多射极输入管可方便地用于输入信号之相“与”,而ECL电路中的射极输出则可简单地用线接方式实现多个输出信号的相“或”.属于ECL电路变型的EFL电路则是充分利用发射极逻辑功能的典型,它的结构如图1(a)所示.图中输入管T_i的
1 Multi-β Transistors and Linear ORs In an effort to develop high-speed silicon integrated circuits, attention has focused on bipolar integrated circuits, which are not only suitable for high-speed operation due to their small junction capacitance, but also The one-way conduction characteristics of a pn junction endow it with a very strong logic function for its emitter junction. For example, a multi-emitter input tube in a TTL circuit can be conveniently used for the AND of an input signal while the emitter The output can simply be wired to achieve multiple output signal phase ORL. The ECL circuit variants of the EFL circuit is to take full advantage of the emitter logic function of the typical, its structure shown in Figure 1 (a) below. Figure input pipe T_i