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N€u dong di9n lam vi~e n ha han IOOnun, di~m lam vi9C sc dO
- D
1)
a J lJ
- Slt d yng d iat ban d an
5. Mc}t s o v an de ve
Cac di6t han dan ngay d ing dugc slu1i,mg n)ng rai trong ky thu~t di¢n
tlr n6i chung, trong di~n tlr c6ng nghi~p n6i riCng va cac m1,lc dich n hu niin
di~n, 6n ap, tach s6ng, h.,1.0 c hc Hn hi¢u, 6n d~nh cac ch€ dQ lam vi~c clla tranz-
ito, dieu c he v.v . .. Khi dung diol can chu y cac di~m sau day:
- Trong d ieu ki~n Slr dl,mg th6ng thuong, mu6n xac dtnh chat luqng cua
a
di6t c6 the: d ung dong h6 v~n nang, d~ thang do thich hqp d~ d o di~n t ra
tllU~n va nguqc cua di61. ThOng lhuong di9n Lra thll~n van k hoang va.i ch1,lc
6m, con di¢n t ra nguqc khoang VaL tnlm kil66m.
- Can phiii hiet c6ng dl,mg clla tUng lo
- .C c
E
p
E-J p
P
N N N
1B B
( Nguac)
( Thuan)
Hinh 2 -15: eclu t~o ciia l rallzito
Tuy t hea s v ph an b 6 c ua cae lOp han dan, t a c o t ranzito P NP h ay tranzito
NPN. K y h i¢u e ua t ranzito n hu s au ( hlnh 2-16). T rong ch6t
- D~t vao tiep giap OC nguon di~n c,!c g6p Ee theo chieu phan c,!c nguqc,
d~t vito tiep giap EB nguon di¢n ap Eb theo chieu phan c,!c thu~n Lam cho cac
di~n tich da 56 0 6 trung) t ruyen qua tiep giap EB ti;lO l~n d ong Ie' c hung loi
vung bazo t ra thanh h~t lhi~u 56 va tiep tl,lc khuech tan sau vao vung bazo
huang toi tiep giap B e. Tren dubng khuech tan m\,?t phan n ha 16 tr6ng tac hgp
voi h~t da s6 c ua bazo (di9n tll') t~o nen dong di~n ct,rC bazo (lb). Do cau t cac h~t khuech tan toi dugc b a cua v~ch
B e va bt t wang g ia toe do OC phan c,!c nguqc cu6n toi mien colccta t~o nen
dong di¢n colceto(le). Q ua phan ttch tren ta rut ra dugc h¢ t hac c o ban vc eac
dong di~n trong tranzito:
IE = IE + Ie
D~ danh gia m ac hao hlJ.t dong khuech tan trong vung hazo. n guai ta dinh
nghia he; s 6 truy~n d~t dong di9n eua tranzitor:
Ie
ex ~--
Te
H9 s 6 xac dtnh chat lugng tranzitor. cang co gia tr~ gan bang 1 t huang chat
lm;mg e ua tranzitor eang t6t.
D6i voi tranzitor N PN nguyen 19 ho~t dc>ng cling lUang t,! voi dieu ki~n cac
c,!e nguon Ee, E" phiii dao e,!e so voi so do cua tranzitor P NP va phan tll' dan
di9n c1a s 6 xu
- * S a do' qrc bl/:o chung ( hinh 2-19)(BC)
a a
Trong d 6 tin hi~u vao d~t 2 c,!c EB, t m hi~u fa hlY 2 c,!c Be. D ong di¢n
vito la d ong di~n c,!c emilOr ( I. = Ie), c on d ong di¢n fa l a d ong d i¢n c olccta (Ira
= 1,): E C
II
" Ur
Be d illlg P NP
1J illll 2 -19. Sa de) mac
T[n hi~u vao lL. s c lam t hay d 6i di~n a p lhu~n t fen tiep g iap EB, do £16 c 6
Ute (h:lI1g di~u k hi0n d ong c,!c g op Ie va di¢n a p lay fa tf~n Rt s c hicn thien t heo
q uy IW)l e ua U", vdi bien d
- VI dong hazo h nhi) h an nhi~u so voi dong q rc c olectu Ie, VI V?y s a d 6 nay
co hie dl;l11g khucch d~i dong di~n. D~ danh gia tac dl;J.ng dieu khi~n c ua dong
di~n IB 1(1i d ong colccta Ie nguoi ta dtnh nghia h~ s 6 khu
- tr~nzito
1.4. C ae t hong s 6 k j thm)t ella
Khi Slr dl,ll1g tranzito c an hiet cae thOng 56 ky lhu~l ella no. Cae thOng 56
nay thuemg e ho san t rong 56 lay tra c W. Cae thOng 56 ehfnh la:
- Lo
nguon tai.lieu . vn
