Sep 23, 2020
Differential Amplifier - Voltage Subtrator
A differential amplifier is basically an electronic amplifier, which has two sources of inputs and amplifies the contrast between those two
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Differential Amplifier - Voltage Subtrator
A differential amplifier is basically an electronic amplifier, which has two sources of inputs and amplifies the contrast between those two
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几个经典差动放大器应用电路详解
简介
经典的四电阻差动放大器 （Differential amplifier，差分放大器） 似乎很简单，但其在电路中的性能不佳。本文从实际生产设计出发，讨论了分立式电阻、滤波、交流共模抑制和高噪声增益的不足之处。
大学里的电子学课程说明了理想运算放大器的应用，包括反相和同相放大器，然后将它们进行组合，构建差动放大器。图 1 所示的 经典四电阻差动放大器非常有用，教科书和讲座 40 多年来一直在介绍该器件。
图 1. 经典差动放大器
该放大器的传递函数为：
若R1 = R3 且R2 = R4，则公式 1 简化为：
这种简化可以在教科书中看到，但现实中无法这样做，因为电阻永远不可能完全相等。此外，基本电路在其他方面的改变可 产生意想不到的行为。下列示例虽经过简化以显示出问题的本质，但来源于实际的应用问题。
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