Operational Amplifiers运算放大器英语翻译

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Operational Amplifiers(运算放大器)

A person working with an op-amp does not ordinarily need to be concerned with its internal construction. It is helpful ,however,to have some general understanding of what the internal

circuitry accomplishes. This permits the user to see how the device performs and indicates some of its limitations as a function unit. 一个人与一个运算放大器工作并非通常需要与它的内部结构有关。这是有帮助的，不过，有一些什么样的内部电路完成大致的了解。这允许用户看到如何执行，并指出该设备作为一个功能单位，它的一些局限性。

The internal circuitry of an op-amp can be divided into three functional units, Figure 8.4 shows a simplified diagram of the internal functional or an op-amp .Notice that each function is enclosed in a triangle .Electronic schematics use the triangel to denote the amplification function, This diagram shows that the op-amp has three basic amplification functions. These functions are general called stages of amplification. A stage of amplification contains one or more active devices and all the associated components needed to achieve amplification .

一个运算放大器的内部电路可以分为三个功能单元，图8.4显示了一个简化的内部功能图或一个运算放大器。注意，每个函数在一个三角形内。使用电子图表来表示的三角区放大功能，该图显示，运放有三


个基本的放大功能。这些功能是一般所谓的放大阶段。一个放大阶段包含一个或多个有源器件和所有相关的需要达到放大元件。

The first stage or input of an op-amp is usually a differential amplifier. This amplifier has two inputs, which are labeled V1 and V2 , it provides high gain of the signal difference applied to the two inputs and low gain for common signals to both inputs simultaneously. The input impedance is high to any applied signal. The output of the amplifier is generally two signals of equal amplitude and 180° out of phase. This could be described as a push -pull input and output. The output stage of an op-amp has a rather low output impedance and is responsible for developing the current needed to drive an external load. Its input impedance must be great enough that it does not load down the output the intermediate amplifier. The output stage can be an emitter-follower amplifier or two transistors connected in a complementary-symmetry configuration. Voltage gain is rather low in this stage with a sizable amount of current gain.

第一个阶段或一个运算放大器的输入通常是一个差分放大器。这种放大器的两个输入，，分别为V1和V2的，它提供了适用于两个输入和常见的信号增益，低两个输入信号的差异，同时高增益。放大器的输出信号一般是两个幅值相等，相位相差180°。这可以说是一个推挽式输入和输出。一个运算放大器的输出级有一个相当低的输出阻

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