本文在对相位噪声的概念、产生及其相关测量方法研究的基础上，设计出一种低噪声频率变换电路。

This paper presents a new type of low noise frequency conversion circuit based on the research of phase noise conception, generation as well as relativity measurement method.

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相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。

Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.

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该文系统地讨论二极管工作在开关特性下所组成电路的频率变换的工作原理。

This paper tries to discuss the work principle of frequency transformation on the circuit where diodes work on on-off speciality.

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