差分放大器是一种特殊的直接耦合放大器，它能有效的抑制零点漂移；它的基本

差分放大器是一种特殊的直接耦合放大器，它能有效的抑制零点漂移；它的基本性能是放大差模信号、抑制共模信号；常用共模抑制比来表征差分放大器对共模信号的抑制能力；稳流电阻的增加可以提高共模抑制比；但稳流电阻不能太大，因此采用恒流源取代稳流电阻，从而进一步的提高共模抑制比。同时，要求电路两边的元器件完全对称，即两管型号相同、特性相同、各对应电阻值相等。为了改善差分式直流放大电路的零点漂移，利用了负反馈能稳定工作点的原理。

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结果 (英语) 1: [复制]

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Differential amplifier is a special direct-coupled amplifier, which can effectively suppress zero drift; its basic performance is to amplify differential mode signals and suppress common mode signals; common mode rejection ratio is commonly used to characterize the ability of differential amplifiers to suppress common mode signals ; The increase of the constant current resistance can improve the common mode rejection ratio; but the constant current resistance cannot be too large, so a constant current source is used to replace the constant current resistance, thereby further improving the common mode rejection ratio. At the same time, the components on both sides of the circuit are required to be completely symmetrical, that is, the two tubes have the same model, the same characteristics, and the corresponding resistance values. In order to improve the zero drift of the differential DC amplifier circuit, the principle that negative feedback can stabilize the operating point is used.

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结果 (英语) 2:[复制]

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Differential amplifier is a special direct coupling amplifier, which can effectively suppress zero-point drift, its basic performance is to amplify the differential mode signal, suppress the common mode signal, common mode suppression ratio is often used to express the common mode amplifier's ability to suppress the common mode signal, the increase of steady-flow resistance can improve the common-mode suppression ratio, but the steady-flow resistance can not be too large, so the use of constant current source instead of steady-flow resistance, thereby further improving the common mode suppression ratio. At the same time, the components on both sides of the circuit are required to be completely symmetrical, that is, the two tubes are the same model, the characteristics are the same, and the corresponding resistance values are equal. In order to improve the zero-point drift of differential DC amplification circuit, the principle that negative feedback can stabilize the working point is used.

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结果 (英语) 3:[复制]

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正在翻译中..

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