Cov Piv Txwv Cov Lus Nug Txog Kev Sib Tham Txog Transistor
Cov transistors yog cov khoom siv hluav taws xob tseem ceeb uas ua lub luag haujlwm tseem ceeb hauv yuav luag txhua lub cuab yeej hluav taws xob niaj hnub no. Ua haujlwm ua cov hloov pauv thiab cov teeb liab amplifiers, transistors ua rau muaj cov thev naus laus zis siab heev xws li khoos phis tawj, xov tooj ntawm tes, thiab ntau lwm yam khoom siv. Hauv tsab xov xwm no, peb yuav tham txog ntau qhov piv txwv thiab lawv cov kev daws teeb meem los pab peb nkag siab zoo dua txog kev ua haujlwm ntawm transistors.
1. Kev Taw Qhia Txog Transistors
Ua ntej peb yuav tham txog cov teeb meem piv txwv, cia peb tham me ntsis txog cov transistors lawv tus kheej. Ib lub transistor yog ib qho khoom siv semiconductor uas muaj peb txheej ntawm cov khoom sib txawv, feem ntau hu ua NPN lossis PNP, nyob ntawm seb cov khoom siv semiconductor doping li cas. Nws muaj peb lub terminals: Base (B), Emitter (E), thiab Collector (C).
Hom Transistors
- NPN Transistor: Ib hom transistor uas txheej puag nyob nruab nrab ntawm ob txheej N-hom.
- PNP Transistor: Ib hom transistor uas txheej puag nyob nruab nrab ntawm ob txheej P-hom.
Ob hom transistors no ua haujlwm zoo sib xws, tab sis qhov kev taw qhia tam sim no thiab bias polarity txawv.
Kev Ua Haujlwm ntawm Transistor
- Ua Ib Lub Qhov Hloov: Transistors siv tau los qhib lossis kaw qhov hluav taws xob hauv lub voj voog.
- Ua ib lub amplifier: Transistors tuaj yeem ua kom cov teeb liab me me ua rau cov zis loj dua.
2. Piv txwv cov lus nug thiab kev sib tham
Lo Lus Nug 1: Kev Teeb tsa Dav Dav ntawm NPN Transistor
Lo lus nug: Ib qho NPN transistor nrog lub hauv paus teeb tsa sib xws muaj emitter tam sim no (IE) ntawm 5 mA thiab collector tam sim no (IC) ntawm 4.9 mA. Txheeb xyuas lub hauv paus tam sim no (IB) thiab α (alpha) parameter ntawm transistor.
Kev Sib Tham:
- Nws paub tias:
- Emitter tam sim no (IE) = 5 mA
- Tam sim no ntawm tus neeg sau khoom (IC) = 4.9 mA
– Lo lus nug: Lub hauv paus tam sim no (IB) thiab parameter α.
1. Xam Qhov Tam Sim No:
Lub zog tam sim no tau txais los ntawm qhov sib npaug:
\[
Kuv_E = Kuv_B + Kuv_C
\]
Yog li ntawd,
\[
I_B = I_E – I_C = 5 mA – 4.9 mA = 0.1 mA
\]
2. Xam Cov Txheej Txheem α:
Tus parameter α (alpha) yog qhov sib piv ntawm cov collector tam sim no thiab emitter tam sim no:
\[
\alpha = \frac{I_C}{I_E} = \frac{4.9 \text{ mA}}{5 \text{ mA}} = 0.98
\]
Yog li, lub hauv paus tam sim no (IB) yog 0.1 mA thiab tus nqi ntawm parameter α yog 0.98.
Lo Lus Nug 2: Kev Teeb tsa Emitter Sib Xws ntawm NPN Transistor
Lo lus nug: Ib qho NPN transistor muaj lub hauv paus tam sim no (IB) ntawm 20 µA thiab lub hauv paus tam sim no nce (β) ntawm 100. Xam cov collector tam sim no (IC) thiab emitter tam sim no (IE).
Kev Sib Tham:
- Nws paub tias:
- Tam sim no (IB) = 20 µA
- Qhov nce tam sim no (β) = 100
- Lo lus nug: Collector tam sim no (IC) thiab emitter tam sim no (IE).
1. Xam Tus Nqi Tam Sim No ntawm Tus Sau Khoom:
Tus collector tam sim no tau txais los ntawm qhov equation:
\[
I_C = \beta \times I_B = 100 \times 20 \text{ µA} = 2000 \text{ µA} = 2 \text{ mA}
\]
2. Xam Emitter Tam Sim No:
Tus emitter tam sim no tau txais los ntawm qhov equation:
\[
Kuv_E = Kuv_B + Kuv_C = 20 µA + 2000 µA = 2020 µA = 2.02 mA
\]
Yog li, tus collector tam sim no (IC) yog 2 mA thiab tus emitter tam sim no (IE) yog 2.02 mA.
Teeb Meem 3: Lub Circuit Amplifier Transistor
Lus Nug: Hauv lub voj voog NPN transistor amplifier, lub zog hluav taws xob ntawm lub hauv paus (V_BE) yog 0.7V, lub zog hluav taws xob ntawm lub collector-emitter (V_CE) yog 5V, thiab lub zog hluav taws xob ntawm lub zog hluav taws xob (V_CC) yog 12V. Yog tias lub resistor ntawm lub collector (R_C) yog 1 kΩ thiab lub zog hluav taws xob ntawm lub hauv paus (IB) yog 30 µA, txiav txim siab lub zog hluav taws xob ntawm lub collector (IC) thiab lub zog hluav taws xob ntawm lub collector (V_C).
Kev Sib Tham:
- Nws paub tias:
– Lub zog hluav taws xob ntawm lub hauv paus-emitter (V_BE) = 0.7V
- Lub zog hluav taws xob ntawm tus neeg sau thiab tus neeg xa hluav taws xob (V_CE) = 5V
- Qhov hluav taws xob qhov chaw (V_CC) = 12V
– Tus neeg sau khoom tiv taus (R_C) = 1 kΩ = 1000 Ω
- Tam sim no (IB) = 30 µA
- Lo lus nug: Tus neeg sau tam sim no (IC) thiab tus neeg sau voltage (V_C).
1. Xam Qhov Tam Sim No Tau Txais (β):
Los ntawm cov qauv saum toj no, peb tuaj yeem xav tias lub transistor nyob rau hauv lub xeev nquag. Yog li peb siv:
\[
V_{CE} = V_C – V_E = 5V
\]
Vim tias V_E me me piv rau hauv av (feem ntau yog 0V), ces:
\[
V_C \ kwv yees li 5V
\]
2. Xam Tus Nqi Tam Sim No ntawm Tus Sau Khoom:
Tus collector tam sim no tuaj yeem suav los ntawm kev siv Ohm txoj cai:
\[
I_C = \frac{V_{CC} – V_C}{R_C}
\]
Hloov cov nqi:
\[
I_C = \frac{12V – 5V}{1000 Ω} = \frac{7V}{1000 Ω} = 7 mA
\]
3. Xam Qhov Voltage ntawm Collector:
Siv cov tam sim no uas tau xam:
\[
V_C = V_{CC} – (I_C \times R_C) = 12V – (7 mA \times 1000 Ω) = 12V – 7V = 5V
\]
Yog li, tus collector tam sim no (IC) yog 7 mA thiab tus collector voltage (V_C) yog 5V.
Xaus
Cov transistors yog cov khoom tseem ceeb hauv cov khoom siv hluav taws xob, ua haujlwm ua cov hloov pauv thiab cov amplifiers. Los ntawm kev nkag siab txog cov piv txwv zoo li qhov saum toj no, peb tuaj yeem siv cov transistors hauv ntau hom circuits tau yooj yim dua. Kev nkag siab txog cov kev teeb tsa xws li cov tam sim no, cov tam sim no collector, cov hluav taws xob collector-emitter, thiab cov tam sim no nce (β) yog ib kauj ruam tseem ceeb hauv kev tsim thiab kev tshuaj xyuas ntawm cov circuits hluav taws xob. Peb vam tias tsab xov xwm no tau pab tau rau kev ua kom peb txoj kev paub txog transistors tob zuj zus!
