Chng 4: Mch dao ng

Th.S. Nguyn Ch Ngc

B mn Vin thng (B3)

ncngoc@hcmut.edu.vn

Ni dung

Mch dao ng hnh sin: MK hi tip c li vng T=1 (hi tip dng) ti 1 tn s v |T|

3

Mch dao ng dch pha RC

4

5

Ghp m (cch ly)

6

Ghp trc tip R, C nh nhau

7

0

0

1

2 6

29 180v

fRC

A

8

Rf = 29R

9

nh hng ca tr khng ra

10

11

Cn bc 2 c ngha hfe > 23+21,6 = 44,6

y l iu kin cn mch dao ng, nu hie nh hn gi tr trn th mch khng dao ng v T < 1

ng thi, khi : (R/Rc) = 0,375.

2

4 6

3 5 4 6

23 23 4

58 58 29

Cfe

C C

C

fe fe

C

R

RR Rh

RR R

R

h hR

R

12

Trnh nh hng tr khng ra/vo

13

Ghp trc tip R, C bt k

14

Mch dao ng cu Wien

15

Mch dao ng cu Wien (tt)

16

17

18

19

Mch dao ng cng hng LC

Colpitts

Hartley

Clapp

Armstrong

20

21

22

Mch dao ng a hi

23

Bi tp

V s v thit k mch dao ng ti fo=10KHz dng cc OP-AMP, cc in tr, v 3 t in C1=1uF, C2=2uF, C3=3uF.

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