8/7/2019 XT2573

1/6

Thit k mch thu FM stereo

cng ti m s: XT2573

LI M UNgy xa con ngi thng dng phng php c trong t nhin nh la

ting ni truyn tn hiu cho nhau .T ,cuc sng con ngi ngy cng

c nng cao .Con ngi khng ngng nghin cu v hc hi .Cc hin

tng t nhin c con ngi pht hin ra nhng u im ca chng v tm

cch pht trin rng hn .Sau chng ta nng ln mt bc v truyn thng tin

cho nhau qua ng cp . ng cp c mt u im l truyn nhanh, n nh,

t b tc ng ca mi trng ngoi, nhng b hn ch v khong cch v kh

nng c ng khng cao . khc phc c vn ny con ngi pht

minh ra v tuyn .C nhiu loi v tuyn s dng tn s khc nhau nhng tn s

FM l tn s c s dng kh nhiu .Do mch pht v thu FM ra i

.Mch pht v thu FM kh gn nh d duy chuyn v hot ng vi n nh

cao.

Vi suy ngh v mong mun vi kin thc m thy c truyn th cho

em. c vn dng vo nhng vic c t cho cuc sng nn em chn ti

tt nghip l :

thit k mch thu FM stereo

8/7/2019 XT2573

2/6

MC LCLi m u

Phn A

L THUYTChng I

LCH S PHT TRINI GII THIU

II LCH S PHT SINH V PHT TRIN ...............................Trang 1

III TNH HNH PHT TRIN V TUYN IN T TRN TH GIITrang 2

IV TNH HNH PHT TRIN V TUYN IN T VIT NAM Trang

2

Chng II

KHI QUT V SNG IN T

I SNG V TUYN ....................................................................Trang 31-nh ngha ..........................................................................Trang 3

2- Cc c tn ca sng v tuyn ............................................Trang 3

II MI TRNG TRUYN SNG ..........................................Trang 5

1- Mi trng ng tn ...........................................................Trang 5

2 -Sng phng trong mi trng in mi l tng.................Trang 6

3 -Sng phng trong mi trng dn kim loi.........................Trang 7

III S PHN CC CA SNG ................................................Trang 71-Phn cc trn ......................................................................Trang 8

2-Phn cc thng ....................................................................Trang 8

IV CC DI SNG V TUYN DNG PHT THANH..Trang 9

Chng III

IU CH TN HIU

I IU CH ..............................................................................Trang 111 -iu kin iu ch............................................................Trang 11

8/7/2019 XT2573

3/6

2 -Phn loi iu ch ............................................................Trang 11

3 -Sng mang iu ch .........................................................Trang 12

II IU CH FM .......................................................................Trang 13

1- Quan h gia iu tn v iu pha ...................................Trang 13

2- Ph tn hiu iu tn v iu pha .....................................Trang 14

3- Mch in iu tn v iu pha........................................Trang 16

III BNG THNG V CNG SUT FM ..............................Trang 17

Chng IV

MY PHT

I NH NGHA V PHN LOI MY PHT.......................Trang 18

1 -nh ngha ......................................................................Trang 18

2- Phn loi my pht ..........................................................Trang 19

A-Theo cng dng ...................................................Trang 19

B -Theo tn s pht thanh.........................................Trang 19

C- Theo phng php iu ch ...............................Trang 19

D- Theo cng sut ...................................................Trang 20

II S KHI TNG QUT MY PHT FM STEREO ..Trang 20

1-S khi.........................................................................Trang 20

2-Nguyn l hot ng ........................................................Trang 21

3-Yu cu ch tiu mch ghp .............................................Trang 22

4-Mt s mch ghp trong my pht ...................................Trang 22

5-Cc bc thit k mch ghp bin p ...............................Trang 22

6-Mt s mch lc trong my pht ......................................Trang 23

V O LNG MY PHT......................................................Trang 23Chng V

S KHI MY THU

I NH NGHA V PHN LOI MY THU ........................Trang 25

1-nh ngha .......................................................................Trang 25

II S KHI TNG QUT MY THU ............................Trang 26

1-S khi tng qut my thu khuch i trc tip ..........Trang 262 -S my thu i tn .....................................................Trang 28

8/7/2019 XT2573

4/6

III S KHI MY THU FM STEREO.............................Trang 29

1-S khi ........................................................................Trang 29

2 -Nguyn l hot ng my thu FM stereo.........................Trang 30

Chng VI

CC MCH GHP TRONG MY THUI MCH VO MY THU ........................................................Trang 31

II MCH KHUCH I CAO TN .......................................Trang 33

III MCH I TN .................................................................Trang 33

1-Nguyn l lm vic ............................................................Trang 33

2- Mch i tn c AFC.........................................................Trang 35

IV MCH DAO NG NI.....................................................Trang 35

1-c im chung ca cc mch to dao ng ......................Trang 35

2-iu kin dao ng ............................................................Trang 36

3- Mch dao ng s dng trong my thu ..............................Trang 37

V KHUCH I TRUNG TN ...............................................Trang 38

VI MCH AGC,AFC ................................................................Trang 39

1- Mch AGC (automatic gain control)...................................Trang 39

2- Mch AFC (automatic frequency control)..........................Trang 39

VII MCH TCH SNG FM ..................................................Trang 40

1-Khi nim tch sng tn s .................................................trang 40

2 -Tch sng tn s dng mch cng hng kp ...................Trang 42

3- B tch sng tn s t s ...................................................Trang 43

VIII MCH GII M FM STEREO .......................................Trang 44

1-Mch ma trn ...........................................................................Trang 442Cu trc b gi m stereo vi s phn chia thi gian cc tn hiu stereoTrang 45

3-Cu trc b gii m stereo vi tch sng ng bao.................Trang 45

4 -Tch sng kiu vng cht pha PLL detecter.............................Trang 46

PHN B

THIT K V THI CNG MCH THU FM

STEREO

8/7/2019 XT2573

5/6

I S MCH ..........................................................................Trang47

II NGUYN L HOT NG CHUNG CA MCH ...... ...Trang 48

III THIT K CC KHI TRONG MCH ..........................Trang 48

1-Khi mch thu i tng ,tch sng v to ra tn hiu FMMPXTrang 48

a -Cc mch ph kin b tr .............................................Trang 50

Mch thng di.....................................................Trang 50 Mch cng hng tn s thu ................................Trang 51 Mch dao ng ni ..............................................Trang 51

2-Mch gii m FM MPX.........................................................Trang 52

A-S mch ....................................................................Trang 52

B-Chc nng ca IC KA 7630 ..........................................Trang 54

3-Mch equalizer ......................................................................Trang 54A-Chc nng ca cc chn IC TA 7630 ............................Trang 55

B-S nguyn l .............................................................Trang 56

4-Mch khuch i cng sut m tn .....................................Trang 56

A-S khi IC BA5406....................................................Trang 56

B-Bng phn phi chn linh kin IC BA5406.....................Trang 57

C-S nguyn l .............................................................Trang 57

5-Mch ngun cng cp ............................................................Trang 58

TNG KT .....................................................................Trang 59

Kt qu t dc Hn ch ca ti Hng m ca ti

Ti liu tham kho

8/7/2019 XT2573

6/6

cng bn ang xem ti Thuvienluanvan.com c trch dn t bn ni dung y .

Trng hp c nhu cu tham kho ton b ni dung, c gi c th t mua ti liu ny t th vin.

Vui lng truy cp ti y xem hng dn :http://thuvienluanvan.com