Page 16 - 電子學含實習

Chapter 7 xږः̒ఙࣖཥ౺᜗ (MOSFET) ׳ɽཥ༩

4. ྡ (4) މఙࣖ ཥ ౺ ᜗€JFET ΍ ๕฽ ׳ ɽ ཥ༩d ߰ JFET ʘ ᔷ୅ ཥ ኬ g =
m
2mA / Vd፩̈ཥڜ r = 40kΩdۆ׳ɽཥ༩ٙཥݴᄣू A = i / i މОk
o
i
i
d
(A) –250c(B) –350c(C) –400c(D) –500f
＋V DD +V DD

40kΩ R D

i i G D i V o V i C i C o V o
V i o
S 20kΩ
500kΩ R GG
1kΩ R S C S

ྡ (4) ྡ (5)

5. νྡ (5) הͪމɓ׳ɽཥ༩dՉʕ MOSFET ʘනΣʝኬމ g d߰Ӛ̋ၾϞ̋
m
A
๕฽ࣙ༩ཥ࢙ C ࣛʘཥᏀᄣूʱйމ A ၾ A dۆ A v2 މОk
S
v2
v1
v1
1
(A) g R (B) 1 + g R (C) 1 + g R (D) gR S f
m
S
D
D
m
m
m
6. νྡ (6) הͪʘཥ༩dMOSFET ʘ࿚˟ཥᏀ V GS(off) = –4VdI DSS =4mAdr = ∞i
d
߰ v = 1.2sin(1000t)mVdۆ v ߒމОk
o
i
(A) –20.2sin(1000t)mV (B) –12.4sin(1000t)mVc
(C) –8.2sin(1000t)mV (D) –4.8sin(1000t)mVf
+12V ＋V DD
R
D
4kΩ R 1 15kΩ
D v o V o
G V i
v i
R L
S
15MΩ R 2 R S 10kΩ
2kΩ 1kΩ

ྡ (6) ྡ (7)
7. νྡ (7) הͪʘఙࣖཥ౺᜗׳ɽኜཥ༩d߰ MOSFET ʘ፩̈ཥڜ r >> R dՉ
d
D
ʕ r ׁ̙ଫdᔷ୅ཥኬ g = 2mA / Vdۆ׳ɽኜཥ༩ٙཥᏀᄣू A = V / V
o
d
m
v
i
މc(A) –15c(B) –10c(C) –8c(D) –4f

11