场效应晶体管特点和作用

时间： 2024-05-11 来源：鲁晶官网

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场效应晶体管是一种通过电场效应控制电流的电子元件。它依靠电场去控制导电沟道形状，因此能控制半导体材料中某种类型载流子的沟道的导电性。那么场效应晶体管特点有哪些呢？下面我们来了解一下。

场效应晶体管特点：

1、场效应管是电压控制器件，它通过VGS来控制ID；

2、场效应管的输入端电流极小，因此它的输入电阻很大。

3、它是利用多数载流子导电，因此它的温度稳定性较好；

4、它组成的放大电路的电压放大系数要小于三极管组成放大电路的电压放大系数；

5、场效应管的抗辐射能力强；

6、由于不存在杂乱运动的少子扩散引起的散粒噪声，所以噪声低。

场效应晶体管作用是什么？

1、场效应管可应用于放大。由于场效应管放大器的输入阻抗很高，因此耦合电容可以容量较小，不必使用电解电容器。

2、场效应管很高的输入阻抗非常适合作阻抗变换。常用于多级放大器的输入级作阻抗变换。

3、场效应管可以用作可变电阻。

4、场效应管可以方便地用作恒流源。

5、场效应管可以用作电子开关。

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本文由三年不鸣转载自鲁晶官网，原文标题为:场效应晶体管特点有哪些，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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