ABSTRACT
This chapter explains the main properties of Operational amplifiers (op amps) and examines the principle of operation of the inverter, non-inverter, voltage follower, summing, voltage comparator, integrator and differentiator op amps. It presents the main properties of an operational amplifier. The chapter aims to understand op amp parameters input bias current and offset current and voltage. It describes the principle of operation, draw the circuit diagram symbol and calculate gain for the following op amps: inverter, non-inverter, voltage follower, summing, voltage comparator, integrator, and differentiator. Op amps can be used to perform mathematical operations on voltage signals such as inversion, addition, subtraction, integration, differentiation and multiplication by a constant. Op amps were originally made from discrete components, being designed to solve mathematical equations electronically, by performing operations such as addition and division in analogue computers. Op amps nearly always use negative feedback, obtained by feeding back some, or all, of the output to the inverting input.
