(一)引言限幅器是这样的非线元件,当其输入信号振幅达到某一定值时(门限值)其输出信号振幅就不随信号而变,因此在调频接收机以及其他的设备中常采用它来限制干扰。最常用的限幅器电路有五极管限幅电路及双三极管限幅电路,后者在工作时没有栅流,而且限幅作用也较前者好,但是关于双三极管限幅器的分析与计算,目前所做的工作尚不多,而且也不完善,只提供了限幅器振幅特性的计算,至于电路参量及电子管工作状态与振幅特性的关 (A) Introduction Limiter is such a nonlinear element, when the amplitude of the input signal reaches a certain value (threshold) its output signal amplitude does not vary with the signal, so FM receivers and other devices are often used It limits the interference. The most commonly used limiter circuits are the pentode limiter circuit and the dual triode limiter circuit, which have no gate current during operation and have a better limiting effect than the former. However, the analysis and calculation of the dual triode limiter , The current work done is not yet much, but also not perfect, only provides amplitude limiting amplitude characteristics of the calculation, the circuit parameters and the working state of the tube and amplitude characteristics of the