Source follower : Vout max/min , SR, Rout

[dinow]

rout of source follower

I really need help in solving the following question. It is a source follower and we have to find Vout max/min , neg SR, positive SR, and Rout.

Please help me out

I have attached the image below and in the attachment

[/img]

 

[gingerjiang]

Vout,min=-2.5+Vsg
Vout,max=200uAx10kOhm
SR+=200uA/50pF
SR- is very large
Rout=1/gm

 

[dinow]

Hello, Could you please help me in a more elaborate answer please? I really appreciate your assistance

 

[gingerjiang]

when input Vin reach to -2.5, output voltage is lowest, at the time the current 200uA flow through the MOS and the resistor 10kOhm
when input Vin reach to +2.5, output voltage is highest, the MOS cuts off, the current 200uA flow into the resistor 10kOhm
when input Vin step from -2.5 to +2.5, SR+ equal to the current which flow through the MOS formerly divided by the capacitor 50pF(the current can be less than 200uA)
when input Vin step from +2.5 to -2.5, the MOS reach to ON state from Cut-off state, and can draw very large current, so SR- is very large
for the MOS work in saturation region, the output resistor is 1/gm approximately
good luck

 

[HenNavarre]

isnt vout, min = -2.5+vsd,sat?