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B
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|
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B
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B
3. Lọc thông dải (Lọc dải thông) loại K:
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B
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15
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a. Kết cấu nối tiếp:
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b. Kết cấu song song
\(67ŒOeG1+G1+X1Ru
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B.
1. Mạch lọc thông thấp:
16
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—
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2. Lọc RC thông cao
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17
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4 d(bX1RLTƒX1R<RL(L(q(
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A. $%&'()*+, /"+,, /0
1. Mạch lọc thông thấp căn bản:
\(676BuRL(XPL(=+(SI,F+N(8OL(R(8?1%
•€Xq(38/1LT_GeŽ–
{Ž}
‹/*
•'XWLM2<RL(‹‹‹
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L7|B7L‹67^LXŽL‹7/\‹‹‹
1
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'N(8OL(R&f+67‹7
Š1T€C‹€6‹€7‹7€
•R_GeLo2LTL7|‹6ŽL‹
2. Mạch lọc thông thấp -40 db/dec
18
\(676DuRL(XPL(=+(SI4ƒC,&•,iL
2LT‹•7u€C‹7€?9€&‹€C7{6•}
(29/1I().+J\(J2LT‹O8L(PB‹B6
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N(8OL(R+E<6CCX_N(h+_GeX6CX_}7
3. Mạch thông thấp -60db/dec
\(676ƒuRL(XPL(R(=+4…C,&•,iL
•J1+T6‹˜B‹BDB‹ƒ6
•'XW~+L'+#/‹‹7
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B. $
1. Mạch lọc thông cao 20db/dec
\(676„uRL(XPL(=+L21BC,&•,iL
•b9X<RL(/1X2+i•1XX1”iJ#/‹67Š13%I_8J2€1&f+3%IB_8
3JyJ€1‹7€‹7€
#/‹‹
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+E<,_OXZL1T'N(8OL(R&o_8+E<
‹6‹6‹(1mLŽL‹
‹‹
•'XW#/‹‹‹
•_GeLoRT‹6‹‹B—ŽL(29|‹
2. Mạch lọc thông cao 40db/dec
\(676…uRL(XPL(=+L21ƒC,&•,iL
20
•b9X<RL(/1X2+i•1XX1”iJ3(OyB_8|6L(q(X€1
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•R_GeLo•‹B
29‹ƒ‹‹67ƒ6ƒ|‹
3. Mạch lọc thông cao 60db/dec
\(676†uRL(XPL(=+L21…C,&•,iL
•(P6‹B‹D‹
•|•6‹|6|•B‹|D|6‹B|D|B‹|D‹
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•(29|6‹B|D2LT‹
•R_GeLo‹‹
‹6|D‹
C. 1$
1. Mạch lọc thông băng tần hẹp
21
|6
|D
B
|B
6
€1
€
R2 = 2R1
C1 = C2 = C
\(676‡uRL(XPL(=+&h+_(šI
2LT‹••
2(S9‹4€&‹47–LB7‹€&{•••}4
O8m|›‹|6G1+G1+/*|D
€‹4€1•••’
€‹4€1‘••œ{4}’
#/‹‹
•_GeL'+()y+
J
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2. Mạch lọc dải băng tần rộng
\(676ŒuRL(XPL,E&h+_J'+
#/‹‹4‹‹
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6
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B
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6
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B
D. 21
22
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()Q+)WL,F+KXPL&a(:8,1<'&'I(?1TJ1+<RL(R1J27
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€*(V+)8K<LM2&'XPL2G5,v+&'XPL(=+(SIqL(LHLLT3Jy
eSy_8/1E1Kh+'N(8OL(R7
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34+434567896:5;!"#
Cấu tạo
V+
V-
Vout
Khu?ch d?i vi sai
Khu?ch d?i trung gian
Khu?ch d?i d?m
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(^Lh+L%LN(eJ1+N(8OL(R(8?1%
4 (eN(8OL(02/G2LT(3</vN(8OL(R'G2X3L(q(38+V2B_8/1
€•/2,€4T('v)WLML%L)8K<LM2<RL(N(8OL(R/G2()N(E
h+L(e+(:8L21N(8OL(R)WLq(38&O(L(?<77777
4 (eN(8OL(RJ8++2&21+j<(8_+N(8OL(R/G2<oLeOI
(28R1<RL(N(8OL(RLT(3GeN(8OL(RJSX*X<h+'(?97
4 (e3<LT(3</vh+,`+L8+LSIJ2EX<+E<~+Jy_8J27
+89XsX</3LLM2N(8OL(R(8?1%
23
4 )2q(38/1_8E1_8(8?e<2GG
€18‹#/17€•
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€18‹#/17€4
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(SI(.{/,6B€Š}
34+4<4=!"#
A. !"1
1. Sơ đồ biến đổi điện áp – điện áp
\(67BBc.j&O~3%I‰3%I
€*G.jJ13%I_8/1X
(
CK<LT(KL1XK<
S+EJJ/J6
0(X8?L(1ZX
•7/(29‹4
2(S93%I/)WL&O~((J‹47/(3GeN(8OL(R
‹43%IJ2+)WLI(2G1/*3%I/173Jy|+b9(jOIb<G1+
G1+(i13%IX<L(1(3GeN(8OL(R•1+E<8e+L`7
24
JyN(%+/1|/‹‹‹|6(a7
KN(oLI(vL()WLK<T2<oL()G.jG28
\(67BDc.j&O~3%I‰3%IB
€*ZLTd‹47O8|••|D(\D7|D
J‹4/77(29J‹4/7{6•}7u8eX*(\|6I(E(a7O8|6‹|B(\‹
{•}
Kh+JyN(%+–/‹|62L(P|6X*8•s7(T(3GeN(8OL(RX7
2. Sơ đồ biến đổi dòng điện – điện áp:
\(67BƒG.j&O~,`+34,`+3
c.j9&O~,`+3((3%I_8J2rX3/*T7
25