Page 10 - 電子學含實習

Chapter 7 xږः̒ఙࣖཥ౺᜗ (MOSFET) ׳ɽཥ༩

7-1 立即練習

1. Ϟᗫఙࣖཥ౺᜗€FETٙાࠑdɨΐО٫ʔ͍ᆽk
(A) ٜ߰ݴ਋ᏀʈЪᓃ Q(V DSQ , I ) ቦڐᆄ֍ਜא࿚˟ਜࣛdਗ਼ிϓ፩̈ڦ໮
DQ
̰ॆ

(B) ᄣ੶ۨ MOSFET ̈ᅀࣛdՉʹݴᔷ୅ཥኬ g ఱʊ݊ո֛࠽
m
(C) MOSFET ཛྷ฽၌ʹݴഃࣖ፩ɝཥڜ r ᒈڐೌᇊɽ
gs
(D) ʹݴ׳ɽΪᅰ DŽ = g r dՉʕ r މӝ๕฽ٙཥڜf
d
m d
2. ݔɓ N ஷ༸ E-MOSFET ʈЪ׵Ѱ˟ཱིձਜdணՉᑗޢཥᏀ V GS(th) = 2Vd຅
V GSQ = 3V ࣛd I = 4mAdϾʹݴ፩̈ཥڜ r = 50kΩdۆՉʹݴ׳ɽΪᅰމОk
o
D
(A) 50c(B) 80c(C) 100c(D) 200f

3. ዁Ъ׵ཱིձਜʘ٤˶ۨ MOSFET ׳ɽཥ༩dՉ I DSS = 6mAdѰ˟ཥᏀ€pinch

- off voltageV = – 3Vd߰ཥ༩ʈЪᓃʘ V =–2VdۆϤࣛཥ༩ʘʝኬ g m
P
GS
ߒމОkc(A) 1.21mSc(B) 1.33mSc(C) 1.82mSc(D) 2.43mSf
2
4. νɨྡהͪʘ׳ɽཥ༩dண MOSFET ʘ V = 1VdK = 1.5mA/V dۆՉᔷ୅ཥ
T
ኬމc(A) 3 mA/Vc(B) 4 mA/Vc(C) 6 mA/Vc(D) 8 mA/Vf

＋V DD ＝5V
R D
2kΩ
1MΩ 1MΩ i o V o
R 1 R 2 C 3
C 2

V i i i
C 1

5. ݔʈЪίѰ˟ਜٙ N ஷ༸ D-MOSFFT ཥ౺᜗dٜݴʈЪᓃʘཛྷ๕฽ཥᏀ V
GS
= –2Vdӝ฽ཥݴ I = 3mA ࣛdʝኬ g = 3mA/Vfٜ߰ݴཛྷ๕฽ཥᏀ V GS ᜊ
D
m
ਗЇ 0V ࣛdۆՉ࿁ᏐٙʝኬމОk

(A) 2mA/Vc(B) 4mA/Vc(C) 6mA/Vc(D) 8mA/Vf

5