Page 21 - 電子學含實習

ཥɿኪўྼ୦€ɨ

ၚ፯ᇍԷ 2 ΝӉᇖ୦ 2

如圖所示之放大電路，設 g = 2mA/V，則其 如圖所示之電路，設互導 g = 2mS，則其
m
m
V i V i
(1) A = V o i (2) Z (3) Z (4) A = i o i c΢މ (1) A = V o i (2) Z (3) Z (4) A = i o i 各為
i
v
v
i
o
i
o
i
Оk 何k
+V DD i i
R D i o V i V
3kΩ C C i o o
D V o 1 R D 2
C 2 R S 2kΩ R L
i i Z 2kΩ ＋ 2kΩ
V i S i V DD
C 1 R S － Z o
1kΩ Z o

Z i ഈ

由汲極輸出，故電路為
༆ (1) V i 由源極輸入，V o
共閘極（CG）放大器

V
A = V o i = gR =× =23 6
v
D
m
(2) Z = R // g 1 m =1// 1 ≈ 033.(kΩ
)
i
5
2
(3) Z o = R D = 3kΩ
i Z 033k
.
(4) A = i 0 i = − A × R o i = − × 3k = −066.
6
v
i
€i o ၾ i i ˙Σ޴ˀ

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