Electronic Devices - Oscillator Circuits - Discussion
Discussion Forum : Oscillator Circuits - General Questions (Q.No. 11)
11.
Referring to this figure, calculate the voltage gain without feedback for the following circuit values: RD = 4 k
, RS = 1 k, RF = 15 k, and gm = 5000 μS.
, RS = 1 k, RF = 15 k, and gm = 5000 μS. 
Discussion:
6 comments Page 1 of 1.
Ece said:
1 year ago
-gm*RD.
= (-5000×10^-6)*(40×10^3)
= -20.
= (-5000×10^-6)*(40×10^3)
= -20.
Claudi said:
1 year ago
How did this (-20) came? Please explain to me.
Ind said:
5 years ago
It's negative since it is in common source configuration, similar to BJT's common emitter configuration which shifts the input signal by 180 degrees.
Mae said:
9 years ago
Why it is negative?
Tricky said:
9 years ago
How this comes gain with feedback formula?
Xxx said:
1 decade ago
Gain without feedback = -gm*RD.
Gain with feedback = A (vf) =-gmRD (RF/ (RF+gm*RDRS) ).
Gain with feedback = A (vf) =-gmRD (RF/ (RF+gm*RDRS) ).
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