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Operational Amplifiers


An operational amplifier (op-amp) is an integrated circuit (IC) chip that contains a high-gain differential amplilier. The inputs have very high input impedance and draw essentially no current.

op-amp symbol

Schematic of an op-amp in an inverting amplifier circuit

In this circuit the output voltage is governed by the following relationship:
Vout = -Vin ( Rfeedback / Rin )

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