MOS管的栅极和漏极短接有什么用
MOS管的栅极和漏极短接有什么用 你确定是GD栅漏极?有一部份应用是把GS短路作为恒流源 补充一下,是PMOS GS短接和GD短接一样,D,S本身就是对称的;最好有个图看看; kevinzcp 发表于 2012-7-7 09:07 static/image/common/back.gif你确定是GD栅漏极?有一部份应用是把GS短路作为恒流源
书上的图是这样接的 没见过这样用的,MOS管主要作用是放大,开关·····
楼主不妨结合电路分析 相当于二极管的作用,具有导通压降低的特点 little_Monkey 发表于 2012-7-7 23:35 static/image/common/back.gif
相当于二极管的作用,具有导通压降低的特点
是否可以说是为MOS管的栅极提供一个偏置呢 spli 发表于 2012-7-7 23:33 static/image/common/back.gif
没见过这样用的,MOS管主要作用是放大,开关·····
楼主不妨结合电路分析 ...
这样用的很多哦,在运放里面用的很多,用作差分放大的恒流源 depending on the application. for example, it can be used as a voltage reference (aka an amplified mosfet), or as a variable capacitor, etc.
millwood0 发表于 2012-7-8 08:24 static/image/common/back.gif
depending on the application. for example, it can be used as a voltage reference (aka an amplified m ...
例如在恒流源中具体是怎么工作的呢?这样接有什么好处呢? 这个是在IC内部的用法吧? 分立的MOSFET中间那个极和源极接到一起了,没法这样用了. 例如在恒流源中具体是怎么工作的呢?这样接有什么好处呢?
using the mosfet as a voltage reference or using it as a regulator?
a mosfet, once it starts conducting, will have almost constant Vgs. This is particularly true for mosfets with low Rds. So you can use them as a voltage reference in place of zeners. Vgs is typically < 2v for logic level mosfets and 3.5 - 4v for regulator mosfets.
a mosfet can also be used as a regulator, just as you would with a bjt.
millwood0 发表于 2012-7-10 00:43 static/image/common/back.gif
using the mosfet as a voltage reference or using it as a regulator?
a mosfet, once it starts cond ...
thanks.... 相当于二极管使用 你确定是MOSFET,一般只有JFET才这样用。
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