Differential Amplifier

This amplifier uses both inverting and non-inverting inputs. If all resistors are equal it becomes a straight difference amplifier. If

then it gives an amplified difference.

Rules application
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Summing amplifier
Difference amplifier
Differential amplifier
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Rule Application:Differential Amplifier

The behavior of most configurations of op-amps can be determined by applying the "golden rules".The voltage at 3 is given by

so by the voltage rule that voltage appears at A. The current rule at A gives

Substitution gives the expression at right.

Difference amplifierAmplified difference
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Electronics concepts

Op-amp concepts
 
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