operational amplifiers and basic applicationsclass.ece.iastate.edu/ee230/lectures/ee 230 lecture 10...
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EE 230Lecture 10
Operational Amplifiers and Basic Applications
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Review from last time
OUTIN
Aβ1AAFB +
=
β1AFB≅
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Review from last time
Feedback significantly and simultaneously improves most parameters of interest by a factor of about 1+Aβ
Feedback properties is the major driving factor behind the evolution and use of operational amplifiers
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Review from last time
Feedback significantly and simultaneously improves most parameters of interest by a factor of about 1+Aβ
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Review from last time
For a VCVS Op Amp
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Review from last time
2
1
OUT
( )12OUT VVAV −=
For a VCVS Op Amp
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Consider the following circuit
AV
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Consider the following circuit
This is exactly the feedback architecture in the case where the input and output variables are voltages
This is a voltage feedback amplifier
AV
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Consider the following circuit
Aβ1AAFB +
=
1
2FB R
Rβ1A +=≅ 1
VAA =
AV
21
1
RRRβ+
=
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1
2
IN
OUTFB R
RV
VA +≅= 1
Basic Noninverting Amplifier
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Redraw this feedback circuit
1
2
IN
OUTFB R
RV
VA +≅= 1
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