Linear Op-amp Operation-Inverting And Non-Inverting Configuration - Operational Amplifiers Tutorials Series

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السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ

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�An op-amp can use negative feedback to set the closed-loop gain as a function of the circuit external elements (resistors), independent of the op-amp gain, as long as the internal op-amp gain is very high
�Shown at left is an ideal op-amp in a non-inverting configuration with negative feedback provided by voltage divider R1, R2
�Determination of closed-loop gain:�

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�Since the input current is assumed zero, we can write v- = R1/(R1 + R2)vOUT
�But, since v+ =~ v- for the opamp operation in its linear region, we can write

v- = vIN = R1/(R1 + R2)vOUT

or, vOUT = ((R1 + R2)/R1)vIN�

�We can derive the same expression by writing

vOUT = A(v+- v-) = A{vIN � [R1/(R1 + R2)] vOUT} �and solving for vOUT with A>>1

CONTINUE READING �
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وَ السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ

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