引言限幅放大器广泛应用于电子战系统,它把幅值电平不同的输入信号转变成幅值电平恒定或近似恒定的输出信号。因为输入电平可能在一个宽范围内变化,例如50到70分贝,所以放大器的小信号增益必须足够大,以便提供所需要的输出电平。这种放大器可以用在许多功能部件中,包括瞬时频率测量接收机、频率存储器回路和数字射频存储器等。在有些情况下,需要限幅放大器的输出波形不失真地再现输入波形。对普通的限幅放大器来说,这并不 Introduction Limiting amplifiers are widely used in electronic warfare systems. They convert input signals with different amplitude levels into output signals with constant or nearly constant amplitude levels. Because the input level can vary over a wide range, such as 50 to 70 dB, the amplifier’s small signal gain must be large enough to provide the desired output level. This amplifier can be used in many features, including instantaneous frequency measurement receiver, frequency memory circuit and digital radio frequency memory. In some cases, the output waveform of the limiting amplifier is required to reproduce the input waveform without distortion. This is not true for normal limiting amplifiers