Question on MOSFET modes of operation

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SUMMARY

The discussion centers on the modes of operation of MOSFETs, highlighting discrepancies between various online resources, particularly videos and tutorials. The participant emphasizes the reliability of written sources like Electronics Tutorials and Wikipedia for foundational knowledge. They assert that understanding the operational principles of MOSFETs is crucial for effective design, while the manufacturing process is not necessary for practical application.

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Helena Wells
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I just came across some videos on youtube which aren't correct or so I think
I have studied the modes of the MOSFETs from this site https://www.electronics-tutorials.ws/transistor/tran_6.html however in many videos such as this : they don't agree with each other.Which is correct and which isnt?
 
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There are many videos on the internet that get wrong.
Videos are usually a waste of time.

Refer to wikipedia for introductory information.

Understanding an electronic component, so you can use it in a design, does not require you understand the process used in it's manufacture.
 
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Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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