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8/19/2019 Lecture4 Opamp Circuits
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OP-AMP
OPERATION AMPLIFIER
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OUT v ?=
Why is this circuit useful ?
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IN v ( t )
OUT v ( t )
IN v ( s )
OUT v ( s )
1
sC
Another way of solving – using Laplace Transform
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Another way of solving – using Laplace Transform
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Taking the challenges :
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Without negative feedback, or with positive feedback , an op-amp
acts as a comparator.
If v+ v- ! ma"imum positive voltage #+$supply%
If v+ v- ! ma"imum negative voltage #-$supply%
&ince there is no feedback or positive feedback from the output toinput, the circuit acts as a comparator. 'he circuit(s gain is )ust the
* #infinite gain% of the op-amp.
OUT v
OUT v
None negative feedback or positive feedback
http://en.wikipedia.org/wiki/Negative_feedback_amplifierhttp://en.wikipedia.org/wiki/Positive_feedbackhttp://en.wikipedia.org/wiki/Comparatorhttp://en.wikipedia.org/wiki/Comparatorhttp://en.wikipedia.org/wiki/Comparatorhttp://en.wikipedia.org/wiki/Comparatorhttp://en.wikipedia.org/wiki/Positive_feedbackhttp://en.wikipedia.org/wiki/Negative_feedback_amplifier
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Comparator
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Bistable circuit
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!chmitt trigger circuit
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END