Electronic Devices - FET Amplifiers - Discussion
Discussion Forum : FET Amplifiers - General Questions (Q.No. 44)
44.
Referring to this figure, calculate Zo for VGSQ = –3.2 V.
362.52 
340.5
420.5
480.9
Discussion:
4 comments Page 1 of 1.
Via M said:
5 years ago
@Alyhoop.
rd = 1/Yon.
rd = 1/Yon.
Alyhoop said:
7 years ago
@Emdzey Molarn.
Why rd =1/25uS.
Why rd =1/25uS.
Emdzey Molarn said:
7 years ago
rd = 1/25uS = 40kΩ
gmo = 2*Idss/|Vp|.
= 2*16mA/4V = 8mS.
gm = gmo*(1-(Vgs/Vp)).
= 8mS*(1-(-3.2V/-4V)) = 1.6mS.
Zo = (rd//Rs// 1/gm)).
= 1/((1/40kΩ)+(1/2.2kΩ) +(1/1/6mS)).
= 480.87Ω.
gmo = 2*Idss/|Vp|.
= 2*16mA/4V = 8mS.
gm = gmo*(1-(Vgs/Vp)).
= 8mS*(1-(-3.2V/-4V)) = 1.6mS.
Zo = (rd//Rs// 1/gm)).
= 1/((1/40kΩ)+(1/2.2kΩ) +(1/1/6mS)).
= 480.87Ω.
Jas said:
8 years ago
Here, Zo=Rs//(1/gm).
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