Rail-to-rail op amp

Rail-to-rail op amp

Op amp input potential is higher than a certain value usually requires a negative power, and a certain value of the positive supply. After specially designed amplifier allows the input potential changes in the whole interval from negative supply to positive supply, and even slightly above or slightly below the positive supply negative supply is also allowed. This is referred to-rail operational amplifier (Rail-to-Rail) input of the operational amplifier.

Many op amp input or not allowed to reach power, the output can not reach the power supply or ground. If a rail to rail input and output, you can. (Of course, can not fully achieved, there is a little slight difference)
 
Many op amp input or not allowed to reach power, the output can not reach the power supply or ground.
If a rail to rail input and output, you can. (Of course, can not fully achieved, there is a little slight difference)
 
https://wenku.baidu.com/view/3dfb5a03a200a6c30c22590102020740be1ecde3.html

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Origin www.cnblogs.com/zhiqiang_zhang/p/11444064.html