Electronic Devices - Oscillator Circuits - Discussion
Discussion Forum : Oscillator Circuits - General Questions (Q.No. 45)
45.
Referring to this figure, calculate the amplification gain with feedback for the following circuit values: R1 = 80 k
, R2 = 20 k, Ro = 10 k, RD = 61 k, and gm = 4000 μS.
, R2 = 20 k, Ro = 10 k, RD = 61 k, and gm = 4000 μS. 
Discussion:
3 comments Page 1 of 1.
Sadullah said:
1 decade ago
What do you solve this question?
Anomie said:
7 years ago
Get RL by getting the parallel of RD Ro and R1+R2.
Then the gain is A = gmRL,
Then get the feedback B = R2/(R1 + R2),
For the final gain with feedback Acl = A/(1+BA).
Then the gain is A = gmRL,
Then get the feedback B = R2/(R1 + R2),
For the final gain with feedback Acl = A/(1+BA).
Freed said:
7 years ago
A = -gmRD where RD = Rd//Ro => 61k//10k.
B = R1/(R1+R2) = -0.2 because negative feedback.
Acl = A/(1+BA) = -4.36.
B = R1/(R1+R2) = -0.2 because negative feedback.
Acl = A/(1+BA) = -4.36.
(2)
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