Source Follower Large Signal - MOSFET amplifier

[krtica]

I'm still not very confident in analyzing circuits. Here's what I know:

1) v_o=v_IN - v_T
2) id=k/2*(v_IN-v_T)^2
3) v_o=v_S-(k/2)(v_IN-v_T)^2*RS
4) v_o = v_S-id*Rs

iDS = v_o/RS
The answer I chose in the photo was based off of other online discussions. I'm very confused and don't have the slightest idea as to where to go. Any ideas appreciated.

 

[rude man]

I'm still not very confident in analyzing circuits. Here's what I know:

1) v_o=v_IN - v_T
2) id=k/2*(v_IN-v_T)^2
3) v_o=v_S-(k/2)(v_IN-v_T)^2*RS
4) v_o = v_S-id*Rs

iDS = v_o/RS



The answer I chose in the photo was based off of other online discussions. I'm very confused and don't have the slightest idea as to where to go. Any ideas appreciated.

Equations 3 and 4 are wrong. Note that Vo and Vs are the same voltage!

I would look carefully at eq. 2 ...

 

[rude man]

I'm still not very confident in analyzing circuits. Here's what I know:

1) v_o=v_IN - v_T
2) id=k/2*(v_IN-v_T)^2
3) v_o=v_S-(k/2)(v_IN-v_T)^2*RS
4) v_o = v_S-id*Rs

iDS = v_o/RS



The answer I chose in the photo was based off of other online discussions. I'm very confused and don't have the slightest idea as to where to go. Any ideas appreciated.

Oh, BTW your answer is correct also. But for the given circuit, you don't know Vo.