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# Mosfet Amplifiers

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These are practice tests and I really need to learn how to do them. Could you please help me understand and solve the entire problem? Any part of the bottom of any graph cutoff is merely a horizontal line showing ground w/ nothing else.

See the attached file.

##### Solution Summary

This solution is provided in 474 words. It uses voltage, branch currents, and step-by-step equations to find the answers to the problems.

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Unfortunately, I don't have a scanner, so I can't scan in my solution, so please bear with my typing. Full solution is as follows:

4A) Let's first define the gate voltage as VGATE, the drain voltage as VDRAIN, and the source voltage as VSOURCE (Different from Vs in the problem). Observe that the path with the 2 resistors is essentially a voltage divider, since for mosfets, no current goes into the gate. Hence, the way I solve this is, I first find the current in the path, which is I = 2Vs/(R1+R2). Then I find the gate voltage VGATE = ...