运算放大器的典型差分放大电路

运算放大器的典型差分放大电路英文回答：
Typical Differential Amplifier Circuit for Operational Amplifiers.
A differential amplifier is an electronic circuit that amplifies the difference between two input signals. It is often used in applications where it is necessary to amplify a small signal while rejecting common-mode noise.
The typical differential amplifier circuit for an operational amplifier consists of two input resistors (R1 and R2) and two feedback resistors (Rf), as shown in the diagram below.
[Image of a differential amplifier circuit]
The input signals are applied to the non-inverting and inverting inputs of the operational amplifier. The output
voltage is taken from the output of the operational amplifier.
The gain of the differential amplifier is determined by the ratio of the feedback resistors to the input resistors. The gain is given by the following equation:
Av = Rf/R1。

The common-mode rejection ratio (CMRR) of the differential amplifier is a measure of its ability to
reject common-mode noise. The CMRR is given by the
following equation:
CMRR = 20 log (Rf/R1)。

The differential amplifier is a versatile circuit that can be used in a variety of applications. It is often used in audio amplifiers, instrumentation amplifiers, and other applications where it is necessary to amplify a small signal while rejecting common-mode noise.
中文回答：
运算放大器的典型差分放大电路。

差分放大电路是一种放大两个输入信号之差的电子电路。

它经
常用于需要放大微弱信号同时抑制共模噪声的应用中。

运算放大器的典型差分放大电路由两个输入电阻器（R1 和 R2）和两个反馈电阻器（Rf）组成，如下图所示。

[差分放大电路图]
输入信号施加到运算放大器的非反相和反相输入端。

输出电压
从运算放大器的输出端获取。

差分放大器的增益由反馈电阻器与输入电阻器的比率决定。

增
益由以下公式给出：
Av = Rf/R1。

差分放大器的共模抑制比 (CMRR) 是衡量其抑制共模噪声的能
力的指标。

CMRR 由以下公式给出：
CMRR = 20 log (Rf/R1)。

差分放大电路是一种用途广泛的电路，可用于各种应用中。

它经常用于音频放大器、仪表放大器和其他需要放大微弱信号同时抑制共模噪声的应用中。