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对数放大器在信号压缩、增益控制、非线性记录、乘除运算、指数运算等都有很广泛的用途。由一个通用运算放大器和晶体管组成的对数放大器,由于其精度差、温漂大,故只能在一些要求不高的地方使用;由两个以上运算放大器组成的对数放大器,如经过精心挑选元器件,仔细调试,精度可达到三级至四级水平,但温度漂移还是较大;近几年推出的集成对数放大器模块,由于将对数电路的集成运算放大器和外围元器件第二次密封集成在一起,减少了
Logarithmic amplifier has a very wide range of uses in signal compression, gain control, nonlinear recording, multiplication and division, exponential operation. A logarithmic amplifier consisting of a general purpose op amp and a transistor can only be used in places where it is less demanding due to its poor accuracy and drift. A logarithmic amplifier consisting of more than two op amps, Components, careful debugging, the accuracy can reach the level of three to four, but the temperature drift is still large; in recent years the introduction of integrated logarithmic amplifier module, the logarithmic circuit due to the integrated operational amplifier and peripheral components for the second time The seals are integrated and reduced