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  An  operational amplifier  (often  op amp  or  opamp ) is a  DC-coupled  high- gain  electronic voltage  amplifier  with a  differential input  and, usually, a  single-ended  output. [1]  In this configuration, an op amp produces an output potential (relative to circuit ground) that is typically 100,000 times larger than the potential difference between its input terminals. Operational amplifiers had their origins in  analog computers , where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits. Electronic symbol The popularity of the op amp as a building block in analog circuits is due to its versatility. By using negative feedback, the characteristics of an op-amp circuit, its gain, input and output impedance, bandwidth etc. are determined by external components and have little dependence on temperature coefficients or engineering tolerance in the op amp itself. Op amps are used widely in electronic devices today, including a vas