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Chapter 7 xږः̒ఙࣖཥ౺ (MOSFET) ׳ɽཥ༩
11. νྡ (7) הͪʘཥ༩dMOSFET ʘᑗޢཥᏀthreshold voltageV = 1Vdਞ
T
2
ᅰ K =0.4mA / V dʔϽᅇӝ፩̈ཥڜdۆ V / V ߒމОk
o
i
(A) –12.5c(B) –9.9c(C) –8.3c(D) –6.4f 103 統測
+10 V +20V
4kΩ
V
o
D 20kΩ 2kΩ V (t)
V i G o
V (t)
i
10 MΩ S
20kΩ
3V 1kΩ C B
+
-
ྡ (7) ྡ (8)
12. νྡ (8) הͪʘ FET ׳ɽኜཥ༩ʕdA = V (t) / V (t) މʃڦʘཥᏀᄣूd༊
o
i
v
ਪৰࣙ༩ཥ࢙ C ܝdՉ | A | ၾৰۃˢ༰ϞОʔΝk
v
B
(A) ᜊʃc(B) ᜊɽc(C) ʔաᅂᚤc(D) ҷᜊf 101 電機
13. ɨΐ̬၇Պۨٙ FET ๕Ꮐཥ༩ʕdV GS(t) މ FET ኬஷٙᑗࠢཥᏀdਞᅰ
2
K ٙఊЗމ mA/V dV DSQ މ FET ٙӝၾ๕ගٜٙݴʈЪཥᏀdண̬ࡈ
FET ٙᆄɢཥᏀޫމ ∞dA = v (t) / v (t) މʃڦཥᏀᄣूd༊ਪɨΐО٫̙
v
o
i
௰ɽٙཥᏀᄣू | A | k 101 電機
v
+9V +10V
3kΩ
v (t) 3kΩ
o
1MΩ v (t)
o
v (t)
i
(A) (B) 2
K=1mA/V 2 v (t) K=0.4mA/V
i
5MΩ V GS(t) =1V V GS(t) =1V
1MΩ
2.5V 2.5kΩ
+
-
+5V
+8V
K=0.8mA/V 2 3kΩ
V GS(t) =+2.5V 3kΩ v (t)
o
v (t) 5MΩ 5MΩ
o
(C) + (D) +
v (t) V DSQ =2V v (t) V DSQ =2V
i
i
- -
5MΩ K=0.7mA/V 2
1kΩ V GS(t) =1V
25