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对数放大器是一种实时的动态范围压缩装置,具有很强的抗过载和抗杂波干扰能力,因此它在雷达机、电子对抗设备、计算机、通信机和测量仪器等技术领域中得到了广泛的应用。在放大器中获得对数振幅特性的基本方法有二:改变单级放大倍数;各级输出连续相加(又分为串联和并联相加两种方式)。前者在理论上可以获得准确的对数振幅特性,但对单级特性有严格要求,因而在实际上只能近似实现。根据各级输出连续相加的原理,可使用没有对数特性的单级去构成对数放大器。经适当设计后可获得足够高的对数精度,并且性能稳定,制作方便,调整容
Logarithmic amplifier is a real-time dynamic range compression device, with strong anti-overload and anti-clutter capability, so it has a wide range of technical fields of radar, electronic countermeasures equipment, computers, communicators and measuring instruments Applications. In the amplifier to obtain the basic characteristics of the logarithmic amplitude of two ways: to change single-stage magnification; continuous output at all levels (again divided into series and parallel add two ways). The former theoretically can get accurate logarithmic amplitude characteristics, but the stringent requirements of the single-stage characteristics, and thus can only be achieved in reality. Based on the principle of successive additions at all levels, a logarithmic amplifier can be constructed using a single stage without logarithmic characteristics. Properly designed to obtain high enough logarithmic accuracy, and stable performance, easy to manufacture, adjust the capacity