Op-Amps 02/14/2008 Lecture 9 1 Winter 2012 UCSD: Physics 121; 2012 2 - + 2 3 4 7 6 divot on pin-1 end inverting input non-inverting input V + V - output Winter 2012 UCSD: Physics 121; 2012 3 Winter 2012 UCSD: Physics 121; 2012 4 - + V - V + V out
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Op-Amps 02/14/2008
Lecture 9 1
Winter 2012
UCSD: Physics 121; 2012
2
-
+
2
3 4
7 6
divot on pin-1 end
inverting input
non-inverting input
V+
V-
output
Winter 2012
UCSD: Physics 121; 2012
3 Winter 2012
UCSD: Physics 121; 2012
4
-
+
V-
V+ Vout
Op-Amps 02/14/2008
Lecture 9 2
Winter 2012
UCSD: Physics 121; 2012
5
-
+ Vin
negative feedback loop
Winter 2012
UCSD: Physics 121; 2012
6
-
+ Vin
Important note: op-amp output terminal sources/sinks current at will: not like inputs that have no current flow
Winter 2012
UCSD: Physics 121; 2012
7
-
+ Vin
positive feedback: BAD
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UCSD: Physics 121; 2012
8
Op-Amps 02/14/2008
Lecture 9 3
Winter 2012
UCSD: Physics 121; 2012
9
-
+
Vin Vout
R1
R2
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UCSD: Physics 121; 2012
10
-
+ Vin Vout
R1
R2
Winter 2012
UCSD: Physics 121; 2012
11
-
+
V1
Vout
R1 Rf
V2 R2
Winter 2012
UCSD: Physics 121; 2012
12
-
+
V- Vout
R1
R2
V+ R1
R2
Op-Amps 02/14/2008
Lecture 9 4
Winter 2012
UCSD: Physics 121; 2012
13
-
+
Vin Vout
C
R
Winter 2012
UCSD: Physics 121; 2012
14
-
+
Vin Vout
R
C
Winter 2012
UCSD: Physics 121; 2012
15 Winter 2012
UCSD: Physics 121; 2012
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Op-Amps 02/14/2008
Lecture 9 5
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UCSD: Physics 121; 2012
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out in
V+
V-
crossover distortion
Winter 2012
UCSD: Physics 121; 2012
18
-
+ Vin out
V+
V-
input and output now the same
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UCSD: Physics 121; 2012
19
-
+ Vin
dog inverse dog
“there is no dog”
We owe thanks to Hayes & Horowitz, p. 173 of the student manual companion to the Art of Electronics for this priceless metaphor.
Winter 2012
UCSD: Physics 121; 2012
20
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