bài tập mô phỏng nhóm 4
Post on 11-Oct-2015
57 Views
Preview:
TRANSCRIPT
-
1
I HC QUC GIA TP.HCM
TRNG I HC BCH KHOA
----------
BO CO M PHNG
Mn : MCH IN T 1
Gio vin hng dn : Thy: CH VIT NHT ANH
Sinh vin thc hin: L Thnh Huy 51101343
Li Ngc Tun 51104466
Lu Xun Hi 51104449
Nguyn Sang Trng Sn 51102938
TP.HCM, THNG 8 NM 2014
-
2
I. Phn mm dng m phng: Phn mm c s dng l Proteus 8, l phn mm cho php m phng hot dng ca mch in t bao gm phn thit k mch v vit chuong trnh iu khin cho cc h vi iu khin nh MCS-51, PIC, AVR, Proteus l phn mm m phng mch in t ca Lancenter Electronics, m phng cho hu ht cc linh kin in t thng dngngoi ra cn m phng cc mch s, mch tuong t mt cch hiu qu. Proteus l b cng c chuyn v m phng mch in t.
*Hng dn s dng c bn Proteus : Bc 1: Khi ng chng trnh ISIS bng cch chn START -> All Program -> Proteus 7 Professional -> ISIS 7 Professional t mn hnh desktop ca Window
-
3
Mn hnh lm vic ca ISIS xut hin vi y cc menu lnh cng nh cc
thanh cng c h tr cho vic to v m phng mch in.
-
4
Bc 2: Ly linh kin t thanh cng c nhp chn vo Component Mode chn tip Pick
from Libraries ca s Pick Devices hin ra
Mun ly linh kin g, ch cn g tn linh kin , sau kch p vo linh kin ly linh
kin ra, v d nh cn ly in tr, ta g Res, sau kich p ly.
-
5
Sau khi kch p vo linh kin trong th vin, ta ng ca s Pick Devices, trong khung
device selector s xut hin linh kin, chng ta nhp chn linh kin v a ra vng v nhp
chut tri l v xong linh kin.
-
6
Sau khi v mch xong, chng ta c th cho mch chy bng cch kch vo nt Play bn gc
tri pha di nh trong hnh
II. Mc tiu: M phng c hot ng ca BJT v MOSFET, kho st mch v so vi l thuyt c hc. Lm quen vi vic ng dng l thuyt vo thc t.
III. M phng mch khuch i:
A. Mch khuch i BJT:
1. B chung (Common Base):
a) Gii thiu:
Mch khuch i BJT mc theo kiu B chung c chn B
u vo mass. Tn hiu c a vo cc E v ly ra trn cc
C.
ng dng ca B-common Amplifier Mch ny t khi c s dng trong cc mch c tn hiu tn s thp nh l b khuch i dng cho microphone. Mt khc, mch ny li c s dng rng ri trong cc mch
-
7
tn s cao nh VHF (Very High Frequency 30 to 300MHz) v UHF (Ultra High Frequency 300MHz to 3GHz). Chng c s dng bi v t din khng b nh hung bi hiu ng Miller v c s cch ly cao gia tn hiu u vo v u ra v B (base) tch chng ra. V s cch ly cao nn dn dn b nh hung nh bi hin tng hi tip t output tr v input
n nh cao. b) M phng: S mch khuch i BJT mc B chung: = 240, VBE=0.7V
Phn cc DC:
-
8
Kt qu m phng: IB=19.2 A
VC=6.26 V
VE=1.06 V
Kt qu tnh theo l thuyt:
VTH =
VCC =
12 = 1.83V
RTH =
= 3.05 k
VTH = RTHIB + VBE + (+1)REIB
IB=20 A VC = VCC RCIB = 12-240*1.2*20*10
-3 = 6.24V
VE = (+1)IBRE = 1.06V
Ch AC:
-
9
Kt qu m phng: vo = 2.9V
vi = 3.52V
= 0.82
Kt qu tnh theo l thuyt:
=
= 30.44
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
10
c) Kt lun:
Kt qu tnh ton cc gi tr DC l thuyt gn st vi cc gi tr khi m phng. H s khuch i A l thuyt c s chnh lch ln vi thc t, 0.82 so vi 0.1 Sai s c th do:
Sai s ca cc thng s linh kin.
Cc thng s ca BJT BC547 trn thc t c th sai khc vi cc thng s l thuyt c lm trn.
2. C chung (common collector): a) Gii thiu:
Mch mc theo kiu C chung c chn C u vo mass hoc dng ngun. Tn hiu c a vo cc B v ly ra trn cc E, mch c s nh sau :
ng dng ca mch C chung: Mch c ng dng nhiu trong cc mch khuych i m (Damper), truc khi chia tn hiu lm nhiu nhnh, ngui ta thung dng mch Damper khuych i cho tn hiu kho hn. Ngoi ra mch cn c dng rt nhiu trong cc mch n p ngun.
b) M phng: S mch khuch i BJT mc C chung:
-
11
Phn cc DC:
Kt qu m phng:
IB=17.4 A
-
12
VC=12 V
VE=1.06 V
Kt qu tnh theo l thuyt:
VTH =
VCC =
12 = 1.83V
RTH =
= 3.05 k
VTH = RTHIB + VBE + (+1)REIB
IB=20 A VC = 12V
VE = (+1)IBRE = 1.06V Ch AC:
Kt qu m phng: vo = 2 V
vi = 3.53V
= 0.57
Kt qu tnh theo l thuyt:
=
= 0.97
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
13
c) Kt lun: Kt qu tnh ton cc gi tr DC l thuyt gn st vi cc gi tr khi m phng. H s khuch i A l thuyt c s chnh lch ln vi thc t, 0.57 so vi 0.97 Sai s c th do:
ca cc thng s linh kin. ca BJT BC547 trn thc t c th sai khc vi cc thng s
l thuyt c lm trn. 3. E chung c RE:
a) Gii thiu: Mch khuych i BJT mc theo kiu E chung c cc E u trc tip xung
mass hoc u qua t xung mass thot thnh phn xoay chiu, tn hiu
a vo cc B v ly ra trn cc C.
Mch khuych i E chung c s nh sau :
-
14
Mch mc theo kiu E chung nh trn c ng dng nhiu nht trong thit b in t.
b) M phng: S mch khuch i BJT mc E chung:
Phn cc DC:
-
15
Kt qu m phng:
IB=19.2 A
VC=6.26 V
VE=1.06 V
Kt qu tnh theo l thuyt:
VTH =
VCC =
12 = 1.83V
RTH =
= 3.05 k
VTH = RTHIB + VBE + (+1)REIB
IB=20 A VC = VCC RCIB = 12-240*1.2*20*10
-3 = 6.24V
VE = (+1)IBRE = 1.06V Ch AC:
-
16
Kt qu m phng:
vo = 4.54 V
vi = 3.52V
= 1.29
Kt qu tnh theo l thuyt:
=
= -2.41
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
17
d) Kt lun: Kt qu tnh ton cc gi tr DC l thuyt gn st vi cc gi tr khi m phng
4. E chung khng c RE: a) Gii thiu:
Mch khuych i BJT mc theo kiu E chung c cc E u trc tip xung
mass hoc u qua t xung mass thot thnh phn xoay chiu, tn hiu
a vo cc B v ly ra trn cc C.
Mch khuych i E chung c s nh sau :
Mch mc theo kiu E chung nh trn c ng dng nhiu nht trong thit b in t.
b) M phng:
-
18
Phn cc DC:
-
19
Kt qu m phng:
IB=0.35 mA
VC=0.36 V
VE=0 V
Kt qu tnh theo l thuyt:
VTH =
VCC =
12 = 1.83V
RTH =
= 3.05 k
VTH = RTHIB + VBE
IB=0.37 mA
VC = VCC RCIB = 12-240*1.2*0.37
-
20
c) Kt lun:
Kt qu VC trong m phng sai so vi l thuyt. iu ny c th do phn mm.
B. Mch khuch i MOSFET: 1. G chung :
a) M phng: S mch khuch i MOSFET mc G chung:
-
21
S dng MOSFET IRF540 c kn=2.75 A/V2 v Vt=2 V
Phn cc DC:
-
22
Kt qu m phng:
ID = 1 mA
VGS = 2.06 V
gm =
= 67 mA/V
Kt qu tnh theo l thuyt:
VTH =
VCC =
15 = 2.29 V
RTH =
= 3.05 k
IB=0 VG=VTH=2.29 V
ID=
kn(VGS-Vt)
2
ID=1.2mA
VGS=VG VS = 2.29-1.2*0.22=2.03V Ch AC:
-
23
Kt qu m phng:
vo = 5.32 V
vi = 3.53V
= 1.5
Kt qu tnh theo l thuyt:
= gm(RD//RL) = 1.2
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
24
b) Kt lun:
Cc thng s thu c trn mch m phng ch c kt qu gn dng so vi l thuyt. c xy ra sai s c th do: - Cc sai s ca linh kin in t. - Do cc thng s ca JFET c mc nh trong m phng l c nh, cn trn thc t JFET c tra cc thng s cc diu kin khc nhau (datasheet).
- Do b qua in tr trong qu trnh tnh ton trn l thuyt (i vi tnh v ).
2. D chung: a) M phng:
S mch khuch i MOSFET mc D chung:
-
25
Phn cc DC:
-
26
Kt qu m phng:
ID = 1 mA
VGS = 2.06 V
gm =
= 67 mA/V
Kt qu tnh theo l thuyt:
VTH =
VCC =
15 = 2.29 V
RTH =
= 3.05 k
IB=0 VG=VTH=2.29 V
ID=
kn(VGS-Vt)
2
ID=1.2mA
VGS=VG VS = 2.29-1.2*0.22=2.03V Ch AC:
-
27
Kt qu m phng: vo = 0.97 V
vi = 3.53V
= 0.28
Kt qu tnh theo l thuyt:
=
= 0,99
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
28
b) Kt lun:
Cc thng s thu c trn mch m phng ch c kt qu gn dng so vi l thuyt. c xy ra sai s c th do: - Cc sai s ca linh kin in t. - Do cc thng s ca JFET c mc nh trong m phng l c nh, cn trn thc t JFET c tra cc thng s cc diu kin khc nhau (datasheet).
- Do b qua in tr trong qu trnh tnh ton trn l thuyt (i vi tnh v ).
3. S chung c RS: a) M phng:
S mch khuch i MOSFET mc S chung:
-
29
Phn cc DC:
-
30
Kt qu m phng:
ID = 1 mA
VGS = 2.06 V
gm =
= 67 mA/V
Kt qu tnh theo l thuyt:
VTH =
VCC =
15 = 2.29 V
RTH =
= 3.05 k
IB=0 VG=VTH=2.29 V
ID=
kn(VGS-Vt)
2
ID=1.2mA
VGS=VG VS = 2.29-1.2*0.22=2.03V Ch AC:
-
31
Kt qu m phng: vo = 5.83 V
vi = 3.53V
= 1.65
Kt qu tnh theo l thuyt:
=
= -2.32
Sng ca Vin v Vout, mu vo l sng ca Vin, mu tm l sng Vout.
-
32
b) Kt lun: Cc thng s thu c trn mch m phng ch c kt qu gn dng so vi l thuyt. c xy ra sai s c th do: - Cc sai s ca linh kin in t. - Do cc thng s ca JFET c mc nh trong m phng l c nh, cn trn thc t JFET c tra cc thng s cc diu kin khc nhau (datasheet).
- Do b qua in tr trong qu trnh tnh ton trn l thuyt (i vi tnh v ).
4. S chung khng c RS: a) M phng:
S mch khuch i MOSFET mc S chung:
-
33
Phn cc DC:
-
34
Kt qu m phng:
ID = 12.4 mA
VGS = 2.29 V
gm =
= 67 mA/V
Kt qu tnh theo l thuyt:
VTH =
VCC =
15 = 2.29 V
RTH =
= 3.05 k
IB=0 VG=VTH=2.29 V
ID=
kn(VGS-Vt)
2
ID=12mA
VGS=VG VS = 2.29-1.2*0.22=2.03V Ch AC:
-
35
Kt qu m phng: vo = 5.52 V
vi = 3.53V
= 1.56
Kt qu tnh theo l thuyt:
= = -36.5
-
36
b) Kt lun:
Cc thng s thu c trn mch m phng ch c kt qu gn dng so vi l thuyt. c xy ra sai s c th do: - Cc sai s ca linh kin in t. - Do cc thng s ca JFET c mc nh trong m phng l c nh, cn trn thc t JFET c tra cc thng s cc diu kin khc nhau (datasheet).
- Do b qua in tr trong qu trnh tnh ton trn l thuyt (i vi tnh v ).
*Tng kt : Qua qu trnh tnh ton l thuyt v m phng thc t bng phn mm proteus 8.0, chng em nhn ra l thuyt v thc t khc xa nhau. Nhm lm vic tp trung nhng vn cha tm ra c nguyn nhn sai st khi thc hin m phng.
top related