本文对一种FM—AM直接变换器电路作了定量分析。在考虑二极管非线性特性影响的条件下,导出了斜率滤波器输出电压与频偏的关系式以及微分增益和微分相位的计算公式。利用计算机对上述特性进行了一系列计算,并由此得出为了减少失真应如何选择工作状态的几点结论。 In this paper, a quantitative analysis of a FM-AM direct converter circuit. Based on the consideration of the nonlinearity of the diode, the relation between the output voltage of the slope filter and the frequency offset and the formulas of differential gain and differential phase are derived. A series of calculations were made on the above characteristics by computer, and some conclusions about how to choose the working state in order to reduce the distortion were obtained.