The other input is called the Non-inverting Input, marked with a positive or “plus” sign ( + ).Ī third terminal represents the operational amplifiers output port which can both sink and source either a voltage or a current. One of the inputs is called the Inverting Input, marked with a negative or “minus” sign, ( – ). These feedback components determine the resulting function or “operation” of the amplifier and by virtue of the different feedback configurations whether resistive, capacitive or both, the amplifier can perform a variety of different operations, giving rise to its name of “Operational Amplifier”.Īn Operational Amplifier is basically a three-terminal device which consists of two high impedance inputs. Operational amplifiers are linear devices that have all the properties required for nearly ideal DC amplification and are therefore used extensively in signal conditioning, filtering or to perform mathematical operations such as add, subtract, integration and differentiation.Īn Operational Amplifier, or op-amp for short, is fundamentally a voltage amplifying device designed to be used with external feedback components such as resistors and capacitors between its output and input terminals.
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