负反馈放大器的噪声分析

NOISE ANALYSIS OF NEGATIVE FEEDBACK AMPLIFIER

提出了采用方框图法分析负反馈放大电路的噪声,得出了负反馈不影响基本放大电路噪声性能的结论,简化了分析的步骤和复杂的计算。举例给出了方框图法分析的具体步骤。讨论了负载电阻噪声对负反馈放大电路噪声性能的影响。

A block-diagram based method for analysing the noise in a negative feedback amplifier is presented. It is shown that negative feedback has no effect on the noise property of a basic amplifier. As a result,the method simplifies the calculation and analysis for an amplifier. The analysis steps of using the method are given through an example. The effect of a load resistor noise on the noise property of a negative feedback amplifier is also discussed.