CHAPTER 8 Operational Amplifiers (OP-AMP) Introduction to Electronics Ref: Electronic Devices and...
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Transcript of CHAPTER 8 Operational Amplifiers (OP-AMP) Introduction to Electronics Ref: Electronic Devices and...
CHAPTER 8
Operational AmplifiersOperational Amplifiers (OP- (OP-AMP)AMP)
Introduction to ElectronicsIntroduction to Electronics
Ref: Electronic Devices and Circuit Theory Ref: Electronic Devices and Circuit Theory BoylestadBoylestad
OP-AMP Common Op-Amp Applications
YTU-Dep. Electrical Eng. / Introduction to Electronics
1. Constant-gain amplifier
2. Voltage summing
3. Voltage buffer
4. Controlled sources
5. Instrumentation circuits
6. Active filters
OP-AMP Constant Gain Amplifier
YTU-Dep. Electrical Eng. / Introduction to Electronics
1R
RA fV
1
1R
RA fV
Inverting Amplifier
Non-inverting Amplifier
OP-AMP Voltage Summing
YTU-Dep. Electrical Eng. / Introduction to Electronics
3
32
21
1
VR
RV
R
RV
R
RV fffo
OP-AMP Voltage Buffer (Follower)
YTU-Dep. Electrical Eng. / Introduction to Electronics
1i
OV V
VA
iO VV
OP-AMP Current-Controlled Current Source
YTU-Dep. Electrical Eng. / Introduction to Electronics
in
in
f
out
in
f
out
inin
fout
R
V
R
V
RR
V
R
V
VR
RV
21 //
kIR
RII
R
RR
R
VI
RR
RRVI
RR
VI
o
ino
ino
ino
2
1
2
21
1
21
21
21
1
//
OP-AMP Low-Pass Filter, First-Order
YTU-Dep. Electrical Eng. / Introduction to Electronics
112
1
CπRfOH
1
1R
RA fv
The upper cutoff frequency and voltage gain are given by:
OP-AMP Low-Pass Filter, Second-Order
YTU-Dep. Electrical Eng. / Introduction to Electronics
The roll-off can be made steeper by adding more RC networks.
OP-AMP High-Pass Filter
YTU-Dep. Electrical Eng. / Introduction to Electronics
The cutoff frequency is determined by: 112
1
CπRfOL
OP-AMP Band-Pass Filter
YTU-Dep. Electrical Eng. / Introduction to Electronics
There are two cutoff frequencies: upper and lower. They can be calculated using the same low-pass cutoff and high-pass cutoff frequency formulas in the appropriate sections.
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-1
R1: 2.2 kΩ
Rf: 220 kΩ
Vs: 100 Sinwt (mV)
Vcc: ±12V
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-1
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-2
R1: 2.2 kΩ
Rf: 220 kΩ
Vs: 100 Sinwt (mV)
Vcc: ±9V
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-2
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-3
R1: 33 kΩR2: 22 kΩR3: 12 kΩ
Rf: 330 kΩ
V1: +0.2 (V)V2: -0.5 (V)V3: +0.8 (V)
Vcc: ±15V
YTU-Dep. Electrical Eng. / Introduction to Electronics
OP-AMP Question-3