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EEE C364/INSTR C 364 Analog Electronics

This document summarizes the key characteristics of operational amplifiers discussed in Lecture 3, including input offset voltage, input bias current, input resistance, and common mode rejection ratio. It also lists the basic op-amp configurations covered: summing amplifier, inverting amplifier, inverting integrator, current-to-voltage converter, inverting differentiator, and non-inverting amplifier. Feedback configurations and derivations of circuit equations for several configurations are presented.

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Angad Sehdev
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54 views21 pages

EEE C364/INSTR C 364 Analog Electronics

This document summarizes the key characteristics of operational amplifiers discussed in Lecture 3, including input offset voltage, input bias current, input resistance, and common mode rejection ratio. It also lists the basic op-amp configurations covered: summing amplifier, inverting amplifier, inverting integrator, current-to-voltage converter, inverting differentiator, and non-inverting amplifier. Feedback configurations and derivations of circuit equations for several configurations are presented.

Uploaded by

Angad Sehdev
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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EEE C364/INSTR C 364

Analog Electronics
Lecture 3
12-01-2012
Characteristics of a practical Op-amp
1. Input Offset Voltage , 6 mV for op-amp 741C
2. Input Offset Current, I
io
=|I
B1
-I
B2
|=200 nA
3. Input Bias Current , I
B
=(I
B1
+I
B2
)/2, 500 nA
4. Differential Input Resistance, Rid=2 MO
5. Input Capacitance, 1.4 pF
6. Input Voltage Range, 13V
7. Common Mode Rejection Ratio (CMRR), 90 dB
8. Power Supply Rejection Ratio(PSRR), 20V/V
Parameter Ideal
Op-amp
Practical
op-amp
Unit
Open Loop voltage gain A 100 dB -
Differential Input resistance R
id
1-10 MO
Output resistance R
o
0 75 O
Bandwidth ,BW 10 MHz
Output voltage with zero input 0 200 mV
Input offset current 0 20 nA
Common mode rejection ratio,
CMRR
100 dB -
Slew rate, SR 0.5 - 20 V/s
Characteristics of an Ideal Op-amp
Opamp Configurations
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
Ideal Operational Amplifier
I
1
= I
2
= 0
R
0
= 0
The Topics covered in this session
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
Feedback Configurations
a) Voltage -series feedback
b) Voltage -shunt feedback
c) Current-series feedback
d) Current-shunt feedback
Feedback Configurations
An Inverting Amplifier
A
An Inverting Amplifier with equivalent ckt
I
1
= I
2
= 0
R
0
= 0
( )
A R
R R
R
R
V
V
A
V
R AR R
R
V
R R
V R V AR V R
R
V
R
AV V
R
V
R
AV V
R
V V
AV V V A AV V
R
V V
R
V V
F
F
i
v
i
F
F
N
F
N F N N i
F
N N i
F
N N N i
N N P id
F
N N i
1
1
1
0
1 1
1
1 1
1 1
1
0
0
1
1
1
+
+
|
|
.
|

\
|
= =
+ +
=
+ +
= +
+
=
+
=

= = =

V
i
V
0
R
1
R
2
Opamp Configurations
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
Current to - Voltage converter
F
R I V =
0
The Topics covered in this session
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
A Summing Amplifier
A
|
|
.
|

\
|
+ + =

3
3
2
2
1
1
0
0
3
3
2
2
1
1
0 0 0 0
V
R
R
V
R
R
V
R
R
V
R
V
R
V
R
V
R
V
F F F
F
+
+
+
The Topics covered in this session
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
An Inverting Integrator
}
+ =

=
t
S
C R
V dt V
RC
t V
dt
V d
C
R
Vs
i i
0
0 0
0
) 0 (
1
) (
) 0 ( 0
Circuit to set the initial condition
A
The Topics covered in this session
Basic Configurations of Op-amp
A Summing Amplifier
Inverting Amplifier
An Inverting Integrator
Current-to-voltage Amplifier
An Inverting Differentiator
Non-Inverting Amplifier
Differentiator Circuit
A
dt
dV
RC t V
R
V
dt
V d
C
i i
s
s
R C
=

=
) (
0 ) 0 (
0
0

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