Talca ed hai eua lin hieu co chu ki IIho hO'n RC dlu hi rfeh phOn 2 Mn.. DOL vOi cae hai Idn so'IMp Ihi hi l.
Trang 16* 89 IQc thong thap b~c 2
cae b¢ lqc thong thap b~e 2 vOi h;'lTn truy~n ehuful
I+J(j-x
theo gia tri ella Q nhu sau:
eua m~eh trong da.i thong rat toe;
• BQ lQe BESSEL: Di;ie tuyen pha eua b¢ IQe trong dili
thong rat tuyen tfnh (tn~ nh6m Ia h&og so) ;
£ eua h¢ so khueeh d~i trong dili thong va co sl! suy
1) Hay xae dinh gia tr! eua Q eho b¢ IQe BESSEL va
ling vai s == IdB
tuyen tfnh eua pha trong m¢t tIn hi¢u am thanh ph(re
t~p, cae Io~i b¢ IQe nao co th~ duqc sii dl;ll1g eho tin
hi¢u am thanh
7** Vi dl} va cac b9 IQc tich cvc
t) Bi~u di8n t6ng quat eua ham truyen eua m<)t bO
IQe thOng thap bl)e 2
.: c 1 +2ajx + (jxt
trong do Go va a la cae h<1ng so thl!e va x j ~ ,
roo
la m(>t b9 l<,>e thOng dai v6i t:fu1 so trung tam to = ~
Hay bi~u di~n dili thong llroo t<:li -3dB theo a va roo
llroo 2) B<) IQc Heh qre co tr~ng thai thay d6i
Uo t
I111T
R
d~i tfnh toan duqe eoi la If tubng va lam vi¢e trong ehe d¢ tuyen tmh
a) Hay tfnh ti s6 eua cae di¢n the phue: j lli
tcing quat duqe djnh nghla trong diU t) va suy ra cae
bi~u tMe eho Go' roO' a va h¢ s6 ehQn Iqc Q
r _ _ _ _ A B - - - ,
(I) (2)
XlSt b¢ IQe nhu hlnh ve tren
M¢t ph5\1 tii 2 el!e g6m m¢t tI,J di¢n C va m¢t di¢n tro
hai ngu6n di¢n ap m¢t ehieu co s.d.d la e I va e2 b&og m¢t ehuy~n m~eh 2 vj trf If tuong Vi¢e chuy6n tu vi
tn nay sang vi trf kia duqc eoi nhu xuy ra t(re thL Chu
Tc va J; BQ ehuy~n m~eh 0 vi trf (!) trong khoilng thm gian ling vai ntra ehu ki [nI:.,(n + ~)I:] , trong
do 11 Ia m¢t so nguyen duong, va 0 vi tff (2) trong khoilng thai gian con I~i eua ehu ki
a) Viet phuong trlnh vi phan eho di~n ap III (t) 0 tren hai d5u t~l khi chuy~n m~ch 0 vi Irf (l) Tfnh /I I (t)
trong khoang thai gian tu f = I1Tc den t (/I + 1)I: ,
biet r&og 1: ::;; rC « 0, SI:
TUC1Tlg tl!, hay tfnh di¢n ap 112(1) 02 dau tI,J khi ehuy~n m,!ch 0 vi trl (2) trong khoilng thai gian tu
f = (n + 1)7; den f (11 + ! )T c
b) Bi~u dien cae gia tri tuc thai i t(t) va i2(t) eua dong di¢n cllng eap hOi cae ngu6n di~n <lP lrong m6i vi trf ella ehuyen m~eh va ca cae gia tr, tlUng blnh <i I (I» V~l
<i 2 (t» eua chUng trong suot chu ki chuy~n mach Tc
Trang 2c) Ch{mg minh dmg tren quan diem cih cac diiu A va
B va d6i vai cac d~i Itrqng di~n trung binh thi m~ch
nay co h~U1h vi nhu m¢t pMn tt'r 2 qrc co di~n tra
tuang duang la Re' Hay bi~u di~n Re thea J; va C
d) S.d.d cua cac may phat bay gia la dc ham hinh
sin cua thai gian co cung t!in s6 f« J;, Li~u m;:tch
tren co con ho<~t d¢ng nhu m9t ph!in tt'r 2 C\!C co di~n
tren Gia thiet 2 tu la nhu nhau va t!in s6 cua 2 b6
gill tri ella dien tra tuang duang Re cho m6i b9 IQc
f) DUa fa cac bi~u thUc cho Go, ())o' a va h~ s6 chQn
lQc Q theo C], C2, C valc'
BAIGIAI
1 Ngll),etlif ('{fa I/I¢f bo giam IIhieu
I) To tillh hilm truven Clio mach, Bi) khuei-h dar lillh 10cIn hIli IlfiYng Fil
hllll rife frong ch{/di) I~ip nen la co:
frong do a = 1'_ ,
R+r
Sir dl,lIIg ('ae dijc linil Clia LM 13700 la co:
V = g(1';, -aV,,)
lit do la 11111 dual' Mm Iruyen :
H= 'i" = a
go
HI/III Ifuyen ndv Ilf(fng U'ng \'(ji hI) Iq(' IhOng IMp b!}c 1 vOi h¢ .lif khuei:h
dy! 1£1 -20loga khOng phI! fhmic rao II' I'a I'ao Idn so' ceif cao
2) r - rg
fI - 2rrC(R + r)
3) ThaI' ('(Ie gia Ifi ,wi la co: fH = alp,lrong do a = 6,74 kHz/rnA
VoifH = 800Hz Ihi II' =O,l2rnA con vOifH = 16kHz lhi lp 2,4rnA
2 Bi) IflC thOng IMp Me 2
D;nh II/dlmll (IP dung Iyi a cho la:
~ -R ~ -I-' =" -="-+ jnCw(!:::, ~) 0,
M(lt kh(ic cong thuc cho hi) chia di¢n ap tqi V+ clIO ta,'
V
-+
w) tai V _cho ta
l::-Trang cMdl) tlly/n tinh lhi l::+ l::- Nell d!}1 x RCm L (Irong
io
d6 io' = _1_) 2rrRC va kMV+ - va Va -, fa thu dwc:
H
Mach nay sf 6n dinh Ii/U (1-n) > 0, ttrc/a II < 1 (,wn m(IC 3.4)
2) Bjng each dong nhal hieill/llfe Ifen I'Oi cong IMc Idng qual:
la thu dlfl!c hi( so' pilain chOi ('Ila m(Jch Q
clia l1lW'hla
,I;,
G(dB)
20
I'd Ian so'd{ic Il'lmg
fI
Do;' vOi cae gia Ir! II gdn Mng 1 Ihi dU'Ong cong Clla hf so' khufie'h dqi co dlnh I1h911, DO! vOi {,(Ic Mn so' {'ao Ihi hi( so' khufi'h dqi gdn vOi gia Ir; tii(m c(in CliO n6 (dljdoc' -40 dBldkall'a9 = :rj Talca ed( hai eua lin hieu co chu ki IIho hO'n RC dlu hi rfeh phOn 2 Mn
Trong mriYng hqp J1 0,/ cal' ClIng pambOn hi mea dqng vi hf so' khulch d\li khOng du gan 1'61 gia tr! tifm c(in dOL l'fYi t = 10 to, Dap ling I'oi lin hifll hinh vuong if dd'u vao vi IMla cae cung pambOn DOL vOi cae hai Idn so'IMp Ihi hi) l<,Ie IJ mi)l hq khufJ('h d{li 1'6 hf so'khuel'b d{/i Mng 2 Do) vOi gia Ir! n = 0,/ va nMlla n = 05 Ihi Idl cd cac hai Clla lin hl(;// hinh v//ong co chu ki lim hon RC I'a 1'6 hierl d¢ IOn dlu dUlJe khufi(-/7 dqi lell 2 Mil, lin hi¢u Mu ra 1£1 hinh vuong 1'6 hien dqlim grip 2 Millin hifll d(IIIl'llo,
T rOllg IrllClng hqp n = 0,9 Cal' hai co tan so' IOn qin eua gia Ir!
1'0 = - 2 1R dfiil dU'(fC khuei:h dai len mol cach dcil1" kl Difu niH dwc
hi/u hiifn Mng cac dao dq/lg gan /llu( tuan hoan d Ian so' fl{iy (xem cac hinh sou),
Trang 3T»RC
Vs (V)
3
1,5
o
-1,5
3
T«RC
vs(V)
1) Biell do
n = 0,1
fot
-n::: 0,1
4,5
3
1,5
o
\,5
3
·4,5
0,09 0,06 0,03
0 -0,03 0,06 -0,09
Vs (V)
In
II
vs (V)
Clio till hii'll ra duCfc tillil tilea I!li·il tMe:
t
QUOII he liar 1l1Cfllg 1(lIg 1'6'1 InI)t hOlo(' cut hd tall \'6fo (khi x = 1 thi t, 0)
Tlln s6fo mh' sf hi kh" hOi mot hf tMng hllo gom 2 hO l!fc Kel qllii eua
I'ih loa; 116 tlln so'm/y 1'6 tlui'llgile tlui), dlf\1c
N (,it {(I mio uJc dallllo; Cltll 1 1011 thi
1 x
-r- + J -Q + \
R6 iI/llg hie l1Iiv IhI' IrllI k!J6l1g hi k/u{ lIita nhulIg he .IIY khm 1(h d£!i Clia
10/111 he Ihong hi phil Ihlloc (hili il \'(/0 Iei'll .1'6' .nmg IjUi.mh fo 1'; pha Clia
milch Ihay d61 nil nlwuh ,f dliL S(( xoay pJw nay nghe Ilury dtfyc I'a liull
cho kh6ng Ihe'.I'lr {hmg duyc cho ('(Ie ml;lc dicit am Ihallh
G(dB)
1.2
x
III
lot
0,045 0,03 0,oI5
°
-0,015 -0,03 -0,045
x
2) B9 khurill dill linh 10011 11all1 viee trang che' <19 luy/n lillh 111'11 IIflf lip
dUllg dinh lucil /lull~li (lia 1'6:
jCm(~ t,)+UI +jCm )<~'I -t,)=O,
\'(/ hil;i; Ih,(c cho h¢ cilia diill (I" fIJi dllu vao liIwili Clla lIola:
T!'( do lum ding la co
v =-~"-
-',
B¢ klllle('h dll; lillh 10011 2 hIm vifc Irong chl do Illyi'll lillit /11;/1 hilll Ih,te
R6 11 '
cho h{J cilia difn tip 1\li dtill WIO IllIIdll nia nola: !::2 = - R fl.!:e ,1'0
+ 5 + ''tJ
dlllh Ii MIlLMAN lai da'u WIO ddo 1'110 la:
R ~ R (R3~', + R4~'2)·
Trang 4TillI ,wi'dde frlmg Clia 111(11'11 It) /i) ~ va he so phi/III eMt
2nC RIR2
Q =l [Ii;
2 vR;'
~6-j ('(Ie IIi so'dii clIO lhi Rz =}RI' lI'rdo fa Ihu dut;fc Rl = 9,liIhd
R, 13/;f)
4 BI) l'lJnll</ng hill' :
A" dUlig dillil Ii MIlLM,lN:
o lai dillll'IIO Iflio Clia h6 kluu;;il doi linh lolin I: ~ jCwL, +
~+jCW
01,/1 ddll \'(/0 lillllill Clia h6 klllllkh dai Iinh 10lln 2:
Ta nillg co
Ii,,:
(tic hip/lIMe SI/II day kili ap dUllg hiPIIIMe clio hI? cilio
• 1\1i ,Mil \',)0 Ilwdnll/a hI? khue('/J dai lillh 10011 I: ~+ 1 + j~CW V,;
, I" , .J' ' I ' kJ / h d ' 'I ' J ' ; jRCw V
• 1(11 (all i'(/O (lao ClUJ )9 'lIIel' w IlIIlloWI~: !2 = 2 k ' :.s;
, 1 + '+ jRCw 2
• tai £Ii/II \'iIO lilllun ella hI? khu(Ji.'h dai lil1h loan 3: b+ =
Gill lhie! CtiC hI? klwei'h dai till II tOllll dell film vifc Irollg chi do IIIVel1 fillil
1111' di,ill the ri Sill Nt! dl/u wio CIIII duing deil Mllg 0, Sail khi klll( IIIl)l s6'
hie/II,I 11111 ilIWc.'
jRCm !::" \-:, -~ ,jRCw !::" '" k!::, + !::" + k~ I'll t, = t,
CliOI' nlng fa CO,'
!:::,(l + kjRCw - (RCw)2) = ~ - jkRCw'6 - (RCw)2 b
2) Bling ('(idl doug nhdt roi ('(Ie htim 11'11,1'/1,1 1'1111,' h9 19C Ihong lhap:
H " , h9 loc lhOllg coo: H
1+ j 8 _,2 1 + )'x - ,2
Q
-hI) lqc
- - = - - - l'11 h9 101' cMII lidi: Ii =
-~ '-~-1 + " X -Q ' ,2 1 + Q - xl
lilllli(in 1/1//1':
N('I( = 1:::3 = () (nic die'1II {{((fug li'llg 1'61 ehllng dlft;fc n& ad'l) IhI' /J(! /1("
b "0> 'i, IJ h9 IDe thttp;
b -:> 'i, lcl h~j Icll' Iho/l g ('III;;
N(:II'i.l ::: b 0 (('(Ie dilm Il(Ofig I'mg 1'61 allt;fc no] ddi) {hi h(! 101'
1:::2 iI) Mlo(' thong lid!;
N('// = () (di/m IUlfltg ling 1'61 110 dlfqc nOI dill) 1'(1 t\ :: 1:::3 {c{k dilm 1t(lfIlg (fIlg 1'61 chling d({(!f no/lieil) Ihi hI) [ge 1:::1 -:> L ho\1c 1:::3 -:> L lJ
haloe ehcin dil;;
T;-o;lg Idl cd cae hie/II/UfC fretl k IJ nghich ddo hf sopMIII eMI ctia mach,
3) hong 3 hI! f/u(c rielf\li l) fhi jRCw}:::" !:::, ~ fUlfIlg I(ng \'61 \'i¢f
fich phiin 11191 liiill, jRCw!:::", kt" + !:::" + IUlfIlg (fIlg 1'61 rifc Ifeh phdn 1lI¢1 liJ/lg 1'61 cae IhJllh phi/II "0 lrang ,Ill' Vi)
!:::, b !:::", fi((fng I(ng roi I';ec In'( 2 lin hi¢lL Tir do {(/ co S(f d6 e/u(e
niingn/a mach:
+\
1:
v
5 B(>lo(' thollg t//(II) ('(il mOl 1<111 ,\0'
Ta ('0 dl(t;fc clic hilu Illtre sail auy khi tip dung dllll! /11(11 111111«1 cae (fi/m:
0: +D-=:" = -= 12jC(j)~ 0;
h,3 -t , 2R !::l'-6!::l'-12'C R J w~,h l ! =0' '
(" 2!:::' - ~, 16jC(J) V _
\'II fai daul'lio aciD nla h(! kIHu';'1i d«i 1[lIh loall:
6!::l, 2~ 3 'C 11 6 'C V - 0
Slrdl,lIIg ('h[{(fug Ir/nil MM'LE (p=jw):
>soive( (3/2/R*(Vb-Va)+6/R*(Ve-Va)-12*C*p*Va=O, 3/21R*(Va-Vb)-6/R*Vb-12'C*p*Vb=O,
2IR*(Vs-Vc)-16/3*C*p*Vc-2IR*Vc::O, 3*C*p*(Ve-Vd)+ 3181R*(Vf-Vd)-3121R*Vd=O,
3/8/R*(Vd-Vf)-3*C*p *Vf-3/2/R*Vf=O, 6*Vb/R+2*Vc/R +3*C*p*Vf+6/5*C*p*Vs=O}, (Va,Vb,Vc,Vd,Vf,Vs));
R2C2p2 + 1
16R-'C' p + 20R C p + 16RCp+ 5
ta ,Ie dlft;fc liJi gidi: !::,
TIt so' uta hie!; I/n'(c hi Irifl lieu 1'61 RC OJ = I, Ille Iil Idn so' hi 10(11 h6
I , a j' 0 = 2nRC' 1
Tiflll ('{in , , 1!l1I so'cao '" G = -lOlog 16RCw 1'61 dl) 5 doi'la -lOdBldecal,tifm ('(ill tei'll ,\0' Iluii) hi G = 0 \'d giao dil;//I
Vi hila do Bo/)E\'07 x '" log Jo :
>assign("); # gan cae gia tri
flem Clillcoldn so'liI ~ fo' _
' 16
>piot(20*log10(subs(R= 1,C=1,p=I*10Ax,abs )VsNe)) ),x=-2,,2),
Trang 52 -1 2
3 dP - - - - - - - - log (x)
-30
40
50
De' kill' 1(111 sf;' 19 kH:, Irfll aolhi fa co X= log 10 -().4 lai hi' \'0 killl{il'h
dlli It) -3dB, I/(c Iii rid! lirOng lirO dell 7.6kH:
6 Ball){' thOng 11)(;'p h(je 2
Dtfil'oi h¢ /9C:
• BUTTEIiWOf{[}{ , IiIlinil hi: sf;' kiluedl dll!:
De' cho h" so' khue(.h dll! chi hi "lilY db! it nM/a tall cqn 0 thi so' hrplg
ell/fa 1'2 p/uii Mllg 0, til do 1(/ eo Q = h'
• BESSEL lalfnh pha cua m(lcb: tg<{l ~' ,(-1t «p <0), (C/lli
Q(x- -1)
Ii f(/ng I'i~c xiiI' dfllh £fJphu thlloe vao S(I Ilw)' dlff (hili eua rosrpkhf x = J
V iJj kiwi min Me 3 tai lfin cqll di/1/1 0: Algx '" x - ~;' fa thu dUf/e:
<p"'Atgx ( x) ;::,-Alg ( " (l+x~) r , ) "'-" + :r x3
Q(x 2 1) Q Q Q
D/plwlo tllY/1I tfnh Illi /on (,\in dieln 0 fa can Q =
• TC}{EBITCHEFF: Neil t6n fa! fhi giii Irt lem nllllt eua hi: ,\0' khU!);'h alii
G"lE hi t(li 1'2 1 _ _ 1_ :
2Ql
GlI/al = -JOJog (1 ( 1 - 2~2 r) ,
Kill G max IdB thl C (1-2~2 r) 10-0,1 nell Q ",0,96
G(dB)
0,1
BUTTERWORTH '-"'-f.J
-20
30
-40
10 X
TCHEBYTCHEFF
x
-0,5
- 1 -I,5
- 2
Plla ([Iii 11(> Ire TCIfEBITCIIEPF khong ('() a(! ltIyfil tinh trong dd! fhong
rilll thallh,
7 Vi dl,1 n/c ht? tich CI!C
III -f I), Tql X = / tM mau J(/ ('ua hilu tMc hlnhd nillJ[ vii III IGol,
mach itic nay fa hq thbng deii viti f(in sotrung tall/fo, Ddi thon:; 1(1; -3d8, 1/((' /a lai III'" it)
?
1+ ~Jt' ~r =2.tildo, x_l"'±2a
Cae ughieru co.y IIgh/a I'ut Ii elui[l nll(1II aUf/c 1.1> 0) CLIa 2 phuong lrinh hac 2 nol Ilinla:
2 d" 6wo ") ,~,' Q 1
(1 , flf 0 - - UJ., 6wo '" ",uwo WI '" ,.~ ,
2a) B9 khuedl dui tinh /oiin / dtlf/C 1161 1I/1/! mqt h6 khu(;c'h aai auo viti hi( ,\6' khu{ii.'h dlli ill -/ wIIi/m viijc lrong chi do tuyen linh nell !'A = - r,
va !::B = 0, Dtnh fu(jt 11111 ap d/fng tlli B cho ta:
!'A 'C V 0
7?+J w w=
(khOng co dong dillY vao B trong h¢ khUii,'h alii J),
Ttrdo 1
RjCw'
2b) B9 khu{i('h dlli tinh to(ill 3 lam vifc trollg (he' at? fUyel1 Iinll III?II
~=O
Dillh lu!}.t lIIif up dl;lflg tai D cho fa:
+ (~+ R J·CW)v + hJ =0
(khollg co dOllgchllY \'00 D frOn}] lit? khue(:h dlli 3j
KllIf.l::'o fa a/We:
R2 1 + J -,R1 ( RCw - - - I ')'
2R, va
Trang 6T
Vi 1 « ,.C «-~- nelluill) "fl S(/I/ 111(11 //1111 Iril111 ({wi d¢ IIgall T{(cf/lg
Tt'rd6 la co "ic hieJ'llu'rc cho III va 112:
11,(1) ('\+("'2 e,)r(r- 1I7 :)/rC
I',)
b)
Tird6.·
I £"+(/2)7;
<II >=- I,dl'"
7; liT,
c) Tii 1M\' < II > = < i" > PMi'n mach
,'oi lI/lIIl11al phalilif 2 nrc
l/rC
die'm A va diffll B co Ihe'
= ((', ('2) 1'{1 < i ,IB:;" < il > q; «'I "'2 )
hie'u (Hin IIii'll tn! /l((fllg
dwmg Clill IIIlIch 11i1i!! 1112 dilm A \'(i B
di Nell 7; T !lrc Ii] /: ~, f lhi 1'1 wi 1'2 hiI'll dbi CIIl{1 it trong 11'1;;1
,/111 Ai !!ll/eh Clie qWIII he rf lrell \'(In dill/I{
B9 kllwkh illfi linh /ix/n hi Ii IJfrfllg \'(1 him l'iee lrong eM db lIIyelllinil nen
i'_= () \'() neil ling dung ilinh IlI(ll lIIilllli (Mu WJO ddo la co:
=0
jl;f<il khdc dinh III(il /Juillfi dielll A clIO 1<1'
~ !:A 'C ('I II) 'C V U
R + J iJJ .'::.s - !::.t\ J IW.:A =
e
Khut.A lrong (,(Je phu(fng Itinh lren 10 Ihll II/(or:
T=
I) Taco Ihlviei
T
Vii II'reIo Mug phep dOllg IIhi/lla Iilu au!)",
- -' - , Wo VI) Q ==
Vi, d/flll CliO hJ Il}c loai III)Y /a I'/n so lrullg Idlll C//O no e6 Ihllhay M!
1:) Nfl' 10 IIU/\' (lic III
fiJi hi) tn, lId' 1i1llnh'
f1I(/ch Mllg dff!? lId fl({l'ng dlliIng uta ell/ing II/(JI ('(kl! df ddng !ch! {(ill I/wy /lU) ".in girl nguyen dtl(1c he \'0'
[llu1ln c/Ult CliO mach
ti5
Trang 7Chit! tritch nhi¢m Xl/a! ball :
Ph6 TOng Giam d6c kiem TC)ng bien t~p NGUYEN QUY THAO
Bien t(ip 119; dUllg :
Trinh h(,y hia :
DOANHONG
Cbe'hdn:
HOANG THUY TRANG
f)I~N TUHOC
\;Ei Sl): 7K.+87 '1'6 D:\I
In 1.000 b,in, kh6 I l) x 27 cm: [ai XI nghi¢p in H~l 'r'ly.S6 in: 22/~)11:
Trang 8~ CONG TV CO PHAN SACH O~I HQC - D~ Y NGHE
D i a chi : 25 HEmThuyen , HA NQi