一个复杂系统的各个部件,通常都是由各个部件对简单输入信号的影响来定义的,实际上也正是这样规定各个部件的技术条件,因而系统对简单输入信号的性能比较容易确定。 然而,当系统的输入是复杂(实)信号,特别是系统里有限幅器、行波管放大器等非线性器件的时候,情况迥异。可以有许多折衷办法,但简单的经验法则不再适用。重要 The components of a complex system are usually defined by the influence of each component on the simple input signal. In fact, the technical conditions of each component are defined in this way. Therefore, the system can easily determine the performance of simple input signals. However, the situation is different when the system inputs are complex (real) signals, especially non-linear devices such as limiters and traveling wave tube amplifiers in the system. There are many trade-offs available, but simple rules of thumb no longer apply. important