Komparatori i pozitivna sprega1 -...
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KomparatoriKratak podsetnik:OPERATIONAL AMPLIFIER BASICSby Harry Lythallby Harry Lythall
Komparator-diferencijalni komparator: poredi potencijale na + i – priključku i na osnovu toga generiše visok ili nizak naponski nivo na izlazu.
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R1
300k
V25Vdc
0
+V+
U1A
V
V
V1
FREQ = 500kVAMPL = 30VOFF = 0
0
D1 D2
R2100k
- V-
OUT
TL082
V
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4 0 V
I ( V 2 )
- 4 0 m A
0 A
4 0 m A
8 0 m A
T i m e
4 0 u s 4 1 u s 4 2 u s 4 3 u s 4 4 u s 4 5 u s 4 6 u s
V ( R 2 : 1 ) V ( R 1 : 1 )
- 4 0 V
0 V
S E L > >
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• Po strukturi pojačavač
• Identičan simbol kao kod operacionog pojačavača
• sličan raspored pinova na integrisanom kolu kao kod operacionog pojačavačakod operacionog pojačavača
• Interna struktura različita
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D1 D2
R1
300k
V25Vdc
0R2100k
OUT7
+2
V+
8
B/S6B
5
U1
V1
FREQ = 500kVAMPL = 30VOFF = 0
0
D1 D2
-3
G1
V-4
LM311
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4 0 V
I ( V 2 )
- 1 . 0 m A
- 0 . 9 m A
- 0 . 8 m A
- 0 . 7 m A
S E L > >
T i m e
4 0 u s 4 1 u s 4 2 u s 4 3 u s 4 4 u s 4 5 u s 4 6 u s
V ( R 2 : 2 ) V ( R 1 : 1 )
- 4 0 V
0 V
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R1
300k
V25Vdc
0R2100k
OUT7
+2 V+
8
B/S6B
5
U1
R3
100 C1100n
0
V1
FREQ = 500kVAMPL = 30VOFF = 0
0
D1 D2 OUT7
-3
G1
V-4
LM311
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4 0
I ( V 2 )
- 1 . 0 m A
- 0 . 5 m A
0 A
S E L > >
T i m e
4 0 u s 4 1 u s 4 2 u s 4 3 u s 4 4 u s 4 5 u s 4 6 u s
V ( R 2 : 2 ) V ( R 1 : 1 ) I ( V 2 )
- 4 0
0
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Operacioni pojačavač
• Ne radi dobro funkciju komparatora
• Radi dobro sa negativnom povratnom spregom
Komparator
Ne radi dobro funkciju pojačavača
Ne radi dobro sa negativnom povratnom spregompovratnom spregom spregom
Poređenje ima smisla za isti red veličine cene
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Komparatori sa histerezisom
Šmitova kolaŠmitova kola
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- 5 V
0 V
5 V
1 0 V
T i m e
0 s 0 . 1 m s 0 . 2 m s 0 . 3 m s 0 . 4 m s 0 . 5 m s 0 . 6 m s 0 . 7 m s
V ( U 3 : O U T ) V ( V 5 : + )
- 2 0 V
- 1 5 V
- 1 0 V
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4 . 0 V
6 . 0 V
T i m e
1 2 0 u s 1 3 0 u s 1 4 0 u s 1 5 0 u s 1 6 0 u s 1 7 0 u s 1 8 0 u s
V ( U 3 : O U T ) V ( V 5 : + )
0 V
2 . 0 V
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4 . 0 V
6 . 0 V
T i m e
1 4 5 . 0 0 u s 1 4 5 . 5 0 u s 1 4 6 . 0 0 u s 1 4 6 . 5 0 u s 1 4 7 . 0 0 u s 1 4 7 . 5 0 u s 1 4 8 . 0 0 u s1 4 4 . 5 6 u s
V ( U 3 : O U T ) V ( V 5 : + )
0 V
2 . 0 V
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OUT7
+2 V+
8
B/S6B
5U3R5
1k
R3
300k
V45Vdc
0
R4100k
V5VAMPL = 0.1
VOFF = 0
OUT7
-3
G1
V-4
LM311
V3
FREQ = 1kVAMPL = 10VOFF = -8
0
D6 D7FREQ = 5MegVAMPL = 0.1
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1 . 0 V
2 . 0 V
3 . 0 V
T i m e
1 4 0 . 0 0 u s 1 4 2 . 0 0 u s 1 4 4 . 0 0 u s 1 4 6 . 0 0 u s 1 4 8 . 0 0 u s1 3 8 . 1 7 u s
V ( U 3 : O U T ) V ( V 5 : + )
- 1 . 0 V
0 V
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