Page 20 - 電子學含實習

Chapter 7 xږः̒ఙࣖཥ౺᜗ (MOSFET) ׳ɽཥ༩

ၚ፯ᇍԷ 1 ΝӉᇖ୦ 1

如圖所示為空乏型 MOSFET 所組成的共汲極 νྡהͪމఙࣖཥ౺᜗ٙᏐ͜ཥ༩dணՉ
（CD）放大器，設其互導 g = 2mS，R = V o
G
m
v
m
1MΩ，R = 3kΩ，R = 6kΩ，則 g = 1mA/Vdۆ༈ཥ༩ٙc(1) A = V i c
S
L
V i
(1) A = V 0 i (2) Z (3) Z (4) A = i o i (2) Z c(3) Z c(4) A = i i o c΢މОk
i
v
o
i
i
i
o
΢މОk i
+V DD
＋V DD
i i R 1
V i V i 2MΩ
i i
C 1 i o V o C 1 C 2 V o
R 2
R G C 2 2MΩ R S i o
R S R L Z i 2kΩ
Z i Z o Z o
由汲極輸出，故電路為 ഈ
༆ (1) V i 由閘極輸入，V o
共汲極（CD）放大器

V gR ' 2 ×(//)
3
6
A = V o i = 1 + ms = 12 36 = . 08
v
gR '
+×(//)
ms
(2) Z i = R G = 1MΩ
(3) Z = R '// g 1 m = ( // )// 1 = . (kΩ
)
36
04
S
o
2
i Z 1M
(4) A = i o i = A × R i L = 08 . × 6k ≈133
i
v
€i o ၾ i i ˙Σ޴́

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