# Voltage-gain Amplifier Model

Discussion in 'Homework Help' started by mihosal, Apr 6, 2012.

1. ### mihosal Thread Starter New Member

Apr 6, 2012
2
0
Hello !!! I am attending a seminar in eectronics which has weekly exercises and labs.

In this week's exercises, there is one that i could not achieve to deal with.

So, I would like to ask for your help if it could be easy for you to deal with this exercise and help me filnish the assignment.

The exercise appears in the pdf file attached !!

PS: THe Id if it is not appeared well is 0.18499498 Amperes

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2. ### panic mode Senior Member

Oct 10, 2011
1,328
305
don't mean to be rude but you are asking too much. it is unlikely that someone will do your homework for you. offering assistance is one thing but not doing everything. you need to try the exercise and ask specific question. the example is very simple, needs hardly anything above ohms and kirchoff's law. even equation for Id is given.

example: finding Vo
you know Vdd, RL and Id, (hint: just apply KVL)

3. ### mihosal Thread Starter New Member

Apr 6, 2012
2
0
I am sorry You are not rude, but maybe i don't explain well !!! I just can't figure out the Δu0. The others I found it out, i thing that were apeared in pdf. I have found both V0 and Id, and trying a lot of figuring out the Delta u0 but can't achieve a result. !! Actually I need help only in this part, i the Delta u0

4. ### panic mode Senior Member

Oct 10, 2011
1,328
305
Id is correct. solving KVL for gate circuit gives quadratic equation and two solutions:
Id=0.185A
Id=0.2262A
first one is correct because second one creates too large voltage drop on Rs and transistor drops out of saturation.

but how did you get 96.5V for Vo when Vdd=120V and Id=0.185A and RL=100 Ohm?