双增益对数中频放大器

介绍了一种用于动目标显示雷达接收机的性能优良的双增益对数中频放大器，讨论了其电路的特点和调试方法。给出了单级电路原理图和利用Electronics Workbench5.0c仿真调试后的单级幅频特性与整机幅频特性图，通过分析估算了放大器电路的性能指标，并指出存在的问题。

关 键 词 增益; 电路; 对数放大器; 中频放大器

Abstract This paper presents a good double gained logarithmic IF amplifier. It can be used for the radar receiver that displays the moving target. The circuit property and the adjusTIng method are discussed in this paper. It also provides the unit circuit diagram and the total output characterisTIc with Electronics Workbench 5.0c.It gives some targets for funcTIon of circuit and points out some problems.

Key words gain; logarithmic amplifier; intermediate-frequency amplifier