第五章 集成运算放大器.pdf

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(1)䕧ܹ㑻ǃЁ䯈㑻੠䕧ߎ㑻ⱘ⬉䏃ᔶᓣঞ⡍⚍DŽ
(2)᱊ԧㅵ T5ǃT6 ঞ 4­Aǃ6­A ੠ 100­A ϝϾ⬉⌕⑤ⱘ԰⫼DŽ
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6ŽÏA 4ŽÏA 100ŽÏA
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T11
T T
3 4 C T12
R
IN+ T1 T2 T8 2
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id
vO
IN-
T13
T7 T9 RL
T5 T6
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(1)䕧ܹ㑻⬅ T1~T6 㒘៤DŽ݊ЁT1ǃT2 ߚ߿᥹៤ᇘ䱣ᔶᓣˈT1-T3 ੠ T2-T4 ߚ߿᥹-CE
㕂ˈ䲚⬉ᵕ᥹T5ǃT6 㒘៤ⱘأ㒘ᗕˈ݅ৠ㒘៤Ꮒߚᬒ໻䕧ܹ㑻ˈ݊݀݅ᇘᵕ⫼6­A ᘦ⌕⑤
⑤԰᳝⑤䋳䕑ˈᬒ໻ֵোҢ T4ǃT6 ⱘ䲚⬉ᵕऩッ䕧ߎDŽT1ǃT2 ᰃ㒉৥ PNPㅵˈβ⌕⬉ڣ䬰
໻ˈᬙৃᦤկϔᅮⱘ⬉य़๲Ⲟ˗T3ǃT4 ᰃ῾৥ PNPㅵˈβؐᇣˈᬙৃֱ䆕᳝䎇໳催ⱘ䕧ܹؐ
㗤य़ˈৠᯊᦤ催њ䕧ܹ㑻ⱘ䕧ܹ⬉䰏DŽϡ䖛Փ⫼ᯊ䳔㽕໪䚼⬉䏃㒭Ꮒߚᬒ໻఼ⱘϸϾ䕧ܹッ
㕂⬉⌕DŽأᦤկⳈ⌕䗮䏃੠Ⳍৠⱘ
Ё䯈ᬒ໻㑻⬅ T7ǃT8ǃT9 㒘៤DŽT7 ੠ T8 ߚ߿㒘៤ᇘ䱣఼ˈT9 ᰃ݅ᇘᵕᬒ໻఼ˈᰃ⬉य़
๲ⲞⱘЏ㽕ᦤկ㑻ˈ100­A ᘦ⌕⑤԰ T9 ⱘ᳝⑤䋳䕑DŽϸ㑻ᇘ䱣఼㑻㘨ՓЁ䯈㑻ⱘ䕧ܹ⬉䰏
ᕜ໻ˈ䕧ߎ⬉䰏ᕜᇣˈҢ㗠ޣᇣњᇍ䕧ܹ㑻ᬒ໻๲Ⲟⱘᕅડˈᑊᦤ催њᇍ T9 ⱘ⬉⌕偅ࡼ㛑
࡯ˈᬙЁ䯈㑻ⱘ⬉य़๲Ⲟᕜ໻DŽ⬉ᆍ C ᰃⳌԡ㸹ٓ⬉ᆍDŽ
䕧ߎ㑻⬅ T10ǃT11ǃT12 㒘៤DŽT10ǃT11 㒘៤໡ড় NPN ㅵˈݡϢ T12 㒘៤Ѧ㸹᥼ᤑ䕧ߎ
⬉䏃DŽ⬅Ѣ T10 ੠ T12 ⱘ෎ᵕⷁ᥹ˈT12 ᑇᯊ៾ℶˈᬙ᳝ĀѸ䍞༅ⳳāDŽ
T13 Ϣ⬉䰏 R2 㒘៤䕧ߎⷁ䏃ֱᡸ⬉䏃ˈR2 ᰃপḋ⬉䰏DŽ಴ R2 䰏ؐ䕗ᇣˈᑇᯊ R2 Ϟⱘय़
䰡ϡ䎇ҹՓ T13 ᇐ䗮ˈT13 ᑇᯊϡ䍋԰⫼DŽᔧ䕧ߎッⷁ䏃៪䕧ߎ⬉⌕䖛໻ᯊˈR2 Ϟⱘय़䰡छ
ᇣˈҢ㗠ֱᡸ⬉䏃ϡޣ⌕⬉ᇣˈT10 ੠ T11 ⱘথᇘ㒧⬉य़䰡ԢˈՓ䕧ߎޣ催ˈT13 ᇐ䗮ˈVCE13
ফӸᆇDŽ
(2)᱊ԧㅵ T5ǃT6 ঞ 4­Aǃ6­A ੠ 100­A ϝϾ⬉⌕⑤ⱘ԰⫼DŽ
㕂˗4­Aأ⑤԰ T3ǃT4 ⱘ᳝⑤䋳䕑DŽ6­A ᘦ⌕⑤㒭 T1~T4 ᦤկ⌕⬉ڣT5ǃT6 㒘៤ⱘ䬰
㕂ˈৃֱ䆕 T7 ⱘ䕧ܹ⬉䰏໻㗠䕧ߎ⬉䰏ᇣ˗100­A ⱘ⬉⌕⑤ᰃ T9أ⑤Ў T7 ᦤկᇘᵕ⌕⬉
䲚⬉ᵕⱘ᳝⑤䋳䕑ˈৃ㦋ᕫ䕗໻ⱘ⬉य़๲ⲞDŽ
[] ೒ ᰃϔϾㅔऩ䖤ᬒ⬉䏃ˈ೒Ё᱊ԧㅵഛЎ⸙ㅵˈβ=100ˈrbb‘=100¡ˈrce=Ğˈ
VBE(on)=≵᳝䕧ֵܹোᯊˈvO=0VDŽ
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