第三章 半导体电路分析基础.pdf

๥ݮ҄דӽ඘Ԩা͖ 3
෎⸔㒗д乬
[] ञᇐԧ⬉䏃ߚᵤⶹ䆚䗝ᢽ฿ぎ乬DŽ
(1)ߚᵤᬒ໻⬉䏃ᯊˈᐌᐌ䞛⫼Ѹ⌕ߚᵤ੠Ⳉ⌕ߚᵤߚ߿䖯㸠ⱘᮍ⊩ˈ䖭ᰃ಴
Ў˖ D DŽ
A. ᱊ԧㅵᰃ䴲㒓ᗻ఼ӊ˗B. ⬉䏃Ё᳝⬉ᆍ˗C. Ѹ⌕៤ӑϢⳈ⌕៤ӑব࣪㾘
ᕟϡৠ˗D. ೼ϔᅮᴵӊϟ⬉䏃ৃ㾚Ў㒓ᗻ⬉䏃ˈ಴ℸৃ⫼঴ࡴᅮ⧚
(2)೒㾷⊩䕗䗖Ѣ㾷އⱘ䯂乬ᰃ˖ B DŽ
A. 䕧ܹǃ䕧ߎഛЎᇣֵোᯊ⬉䏃ⱘѸ⌕ᗻ㛑˗B. 䕧ߎЎ໻ֵোᯊⱘᐙᑺϢ
ᔶ˗C. 䕧ܹЎ催乥ֵোᯊ˗D. 䕧ܹЎԢ乥ֵোᯊ˗E. 䕧ܹЎℷᓺ⊶ᯊ⊷
(3)H খ᭄ㄝᬜ⬉䏃⊩䕗䗖Ѣ㾷އⱘ䯂乬ᰃ˖ A DŽ
A. 䕧ܹǃ䕧ߎഛЎᇣֵোᯊ⬉䏃ⱘѸ⌕ᗻ㛑˗B. 䕧ߎЎ໻ֵোᯊⱘᐙᑺϢ
ᔶ˗C. 䕧ܹЎ催乥ֵোᯊ˗D. 䕧ܹЎԢ乥ֵোᯊ˗E. 䕧ܹЎℷᓺ⊶ᯊ⊷
(4)FET ᬒ໻఼Ϣ BJT ᬒ໻఼ˈϸ⾡⬉䏃ⱘ㒘៤ॳ߭ A DŽ
˗A. ⳌৠDŽे䳔㽕⬉⑤ˈ䆒㕂ড়䗖ⱘᎹ԰⚍ˈѸ⌕ֵো㛑㹿ᬒ໻Ϩϡ༅ⳳ
B. ϡৠDŽ಴Ў IGĬ0ˈIBĮ0
(5)FET ᬒ໻఼Ϣ BJT ᬒ໻఼ϸ⾡⬉䏃ⱘߚᵤᮍ⊩˖ A DŽ
A. ⳌৠDŽ䛑᳝೒㾷⊩੠ㄝᬜ⬉䏃⊩˗B. ϡৠDŽ಴Ў FET ≵᳝䕧ܹ⡍ᗻˈা
᳝䕀⿏⡍ᗻˈϨㅵᄤⱘ⬉⌕ᮍ⿟гϡⳌৠ
[] 䗝ᢽ฿ぎ乬DŽ
ᬒ໻఼ĉ੠ᬒ໻఼Ċˈߚ߿ᇍৠϔֵো䖯㸠ᬒ໻DŽ 䕧ߎッᓔ䏃ᯊˈ䕧ߎ(1)
ৠЎ 5V˗䛑᥹ܹ 2k¡䋳䕑ৢˈᬒ໻఼ĉⱘ䕧ߎϟ䰡Ў ໻఼Ċⱘ䕧ߎ
ϟ䰡Ў 4VDŽ 䖭䇈ᯢᬒ໻఼ĉⱘ䕧ߎ⬉䰏㑺Ў A ˈᬒ໻఼Ċⱘ䕧ߎ⬉䰏㑺
Ў B DŽ
A. 2k¡˗B. ¡˗C. 10k¡
᭄ϟ䰡ˈЏ㽕ᰃ಴Ў C ⱘᕅડ˗Ԣ乥סᬒ໻⬉䏃ᇍ催乥ֵোⱘᬒ໻(2)
᭄ϟ䰡ˈЏ㽕ᰃ಴Ў A ⱘᕅડDŽסᯊᬒ໻
A. 㗺ড়⬉ᆍ੠ᮕ䗮⬉ᆍ˗B. ᱊ԧㅵⱘ䴲㒓ᗻ˗C. ᱊ԧㅵⱘᵕ䯈⬉ᆍ੠ߚᏗ
⬉ᆍ
˗᭄ⱘᐙؐ㑺ϟ䰡ЎЁ乥ᯊⱘ Bסᔧ䕧ֵܹো乥⥛Ў fLǃfH ᯊˈᬒ໻(3)
᭄ⱘ䰘ࡴⳌ⿏㑺Ў Gס៪㗙䇈ᰃϟ䰡њ D dB˗ℸᯊϢЁ乥Ⳍ↨ˈᬒ໻
ᑺ˗
(A. . . )˗(D. 3dBˈE. 5dBˈF. 7dB)˗(G. 45eˈH. 90eˈI..
1
180e)
[] 䯂ㄨ乬DŽ
( ᭄ⳌᔧѢ໮ᇥ˛( 105סᶤᬒ໻⬉䏃ⱘ⬉य़๲ⲞЎ 100dBˈ݊⬉य़ᬒ໻(1)
᭄Ўס᭄Ў 100ˈ݊⬉य़๲ⲞⳌᔧѢ໮ᇥ dB˛( 40dB ) ⬉य़ᬒ໻ס㢹⬉य़ᬒ໻
1000 ਸ਼˛( 60dB )


(2)ᶤᬒ໻⬉䏃ⱘ| AV | ⱘᇍ᭄ᐙ乥⡍ᗻབ೒ (a)᠔⼎DŽ⬅೒ৃ㾕ˈ䆹⬉䏃

8
ⱘЁ乥⬉य़๲Ⲟ| AVM | = 60dB ˗Ϟ䰤乥⥛ fH= 10 Hz ˗ϟ䰤䰤乥⥛ fL=
100Hz ˗ᔧf=fH ᯊ⬉䏃ⱘᅲ䰙๲Ⲟ= 57 dB˗ᔧf=fL ᯊ⬉䏃ⱘᅲ䰙๲Ⲟ= 57
dBDŽ
ˈ᳝ϸϾ᱊ԧㅵᬒ໻⬉䏃ˈ݊ᔶᓣ䛑བ೒ (b)᠔⼎DŽ೼䕧ܹℷᓺֵোᯊ(3)
䕧ߎ⬉य़⊶ᔶߚ߿བ೒ (c)੠(d)᠔⼎ˈ䆩䇈ᯢ䖭ᰃҔМॳ಴ᓩ䍋ⱘ˛৘ሲѢҔ
Мᗻ䋼ⱘ༅ⳳ˄佅੠ǃ៾ℶ˅˛ᗢḋᠡ㛑⍜䰸䖭⾡༅ⳳ˛˄ӓġ෍ (c)ಾͮۤ
˅ࠩӎಠġჾ௲ಁᄢٝᆴԤd؟ಞყē෍ (d)ಾࠉᄘಞყd
v O
A v /dB RC
RB
80
£«20dB/®±¶Æµ¹Ï £-20dB/®±¶Æµ¹Ï
60
v
i VCC
40
20 VBB
0
2 4 6 8 10
1 10 10 10 10 10 f / Hz
(a) (b)
(c)
(d)
೒
(4)བᵰᬒ໻఼ⱘ⬉य़๲ⲞЎ 40dBˈ䕧ܹ⬉䰏Ri=10k¡ˈ䋳䕑⬉䰏RL=20k¡ˈ
݊⬉⌕๲ⲞЎ໮ᇥ˛˄ӓġ࿙ AV=VO/VI=IORL/IIRI=AIRL/RIē ൎྻ AI=AV RI/RL=100
‚10/20=50 Ϳēއ 34dB˅
ᅮࡴ೼ᬒ໻఼Ϟⱘֵো⑤ݙ䰏 RS=1k¡ˈ݊ッ⬉य़๲Ⲟ˄ेRS=0 ᯊⱘ๲؛(5)
˛䯂ᬒ໻఼ⱘ䕧ܹ⬉䰏᳝໮໻ˈסⲞ˅ᰃ⑤⬉य़๲Ⲟ˄े RSĮ0 ᯊⱘ๲Ⲟ˅ⱘ 2
˄ӓġRI/(RS+ RI)=1/2ēൎྻ RI=1kȦ˅
2
(6)ᶤᬒ໻఼᥹ RL=10k¡䋳䕑ᯊⱘ⬉य़๲Ⲟˈᰃ᥹RL=2k¡䋳䕑ᯊ⬉य़๲Ⲟⱘ
䯂ᬒ໻఼ⱘ䕧ߎ⬉䰏᳝໮໻˛˄ӓġ಴Ў 10/(RO+10)=3‚2/(RO+2)ēൎྻˈס 3
RO=10kȦ˅
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