Based on the speciality of transistors non-linearity, using maths method, this article analyses the cause of whistle of frequency conversion circuit and provides method to eliminate.

本文根据晶体管非线性元件的特点，利用数学推导方法，从基础上分析了变频工作啸叫的原因，并提出了消除方法。

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This paper analyses the internal circuit of XTR101 and derives its maths model, and introduces the using method of several kinds of current transmitter thereof.

本文对XTR101的内部线路进行分析，推导出其数学模型，并据此介绍几种电流变送器的使用方法。

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Based on the theory of ISAR, using simple maths methods, the method of using arbitrary times polynomial simulation for the nonlinearity testing of LFM signal is studied for the first time.

从基本的ISAR成像知识出发，运用简单的数学方法，首次对用任意次曲线来模拟扫频非线性曲线的方法进行了研究。

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