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.

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。

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The power supply module provides the control circuit, the drive of frequency conversion circuit, transaction circuit and DSP with different power supply.

电源模块为系统控制电路、变频驱动电路、变送电路、DSP芯片提供不同要求的电源。

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The principle of Thermistor-frequency conversion circuit used in temperature measurements is introduced in this paper.

本文介绍一种测温用的热敏电阻频率转换电路的工作原理。

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