Question

hey guys have you done all the Midterm ?
for me is just missing Q4, Q5, Q6 ... Does anybody help me finish these ?
Q4 :
What is the expression for vOUT in terms of vIN, R, and b when vIN is greater than 0V?
What is the expression for vOUT in terms of vIN, VS, R, and b for this amplifier when vIN is greater than 0V?

Answer 1

first, (R*b)/(1+R*b)*vIN : second (VS*(1+R*b)-vIN)/(1+R*b)

Answer 2

Thank so much Malchiva !! .. Can you help me with Q5 and Q6 too ?

Answer 3

1)Vo* (R3-(B*R1*R3)+R1+R2+A*R2)/(R3-B*R1*R3)=VIN
2)i1=V0/(R3-B*R1*R3)
3)vo = vth
4)Rth=Vth/Isc

Answer 4

Q6: The circuit elements have the following values: Vin=15V, R1=0.5Ω, R2=1.5Ω, R3=5Ω, A=2 and B=1.5. is it formula of Q6 ?

Answer 5

yes

Answer 6

Thank you very much Vivek... I'll solve this.. after I'll say the answers here.. after can you check this out whether the values correct or not ?

Answer 7

ok

Answer 8

Vo = 3 ?

Answer 9

correct

Answer 10

I= 2.4 ?
vth= 3
Rth = 1.25 Ohm ?

Answer 11

not sure of Rth but other answers are correct.. just give it a try

Answer 12

yeah... you're right the Rth is not correct..

Answer 13

Do you know how can I solve it ?
and by the way.. you know how Can I solve the Q5 ?

Answer 14

a)vs-(r*iD)
b)-3*f*(Vgs^2)*R

Answer 15

try Rth to be 2

Answer 16

sorry, but it's no correct .. it's not 2

Answer 17

i dont know:(
got Q5?

Answer 18

and I only have one more chance.. because it's my final check right now on Q6

Answer 19

yeeah I got it .. thanks very much man

Answer 20

your values on Q5 is the same of mine ?

Answer 21

wat r ur values?

Answer 22

Here, VS=80V, R=1.5kΩ, and the transistor parameter f=2mAV3. The amplifier is biased with VIN=2V.

Answer 23

R is 3K

Answer 24

Rth is it 3 ? on Q6 ? are you sure.. because its my final check on Q6 :/

Answer 25

3k ?

Answer 26

sry its my r value in Q5

Answer 27

i'm not sure of Rth