How can i know Vds in advance before simulation?

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SUMMARY

Understanding the drain-source voltage (Vds) is crucial for ensuring MOSFETs operate in the saturation region. If Vds is lower than the saturation voltage (Vdsat), the transistor may inadvertently operate in the linear region, leading to performance issues. Calculating Vds can be achieved using circuit theory principles, particularly in common source amplifiers with a drain resistor. For accurate results, it is essential to analyze the specific circuit configuration being used.

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Tesla Gwon
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i think this question is very important.
We must know Vds to make MOSFETs in saturation region.
if not, there would always be possibilities that a transistor falls in a linear region as Vds is lower than Vdsat.

Of course, i can calculate Vds in a CS AMP with a drain resistor.
I mean, in the other configurations, we should also know Vds.

How can i calculate it?
 
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Well you need to use your circuit theory knowledge and solve for Vds.
Also you can show as a circuit that you have a problem with.
 

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