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抑制电声产品噪声的方法（下）三、减小放大电路噪声的措施１．采用适当的电路（１）变压器耦合当信号源的电阻很小，不能通过调整输入晶体管的工作点以获得最佳噪声系数，就可采用变压器耦合。它是解决信号源电阻Ｒｓ小于最佳源电阻Ｒｓｏｐｔ噪声匹配问题方法之一。变压...
Suppression of electro-acoustic noise products (below) Third, to reduce the noise amplifier circuit 1. Use the appropriate circuit (1) transformer coupling When the signal source resistance is very small, you can not adjust the input transistor operating point for the best noise figure, you can use the transformer coupling. It is one of the ways to solve the noise matching problem that the signal source resistance Rs is less than the optimum source resistance Rsopt. Transformer ...