Operational Amplifier (Op-Amp)
A high-gain DC-coupled electronic voltage amplifier with differential inputs and single-ended output.
Governing formula
V_out = A_OL (V_+ - V_-)
SI unit
V (Volts)
In depth
Ideal op-amps have infinite open-loop gain A_OL, infinite input impedance, and zero output impedance. Negative feedback controls overall voltage gain precisely.
Examples in the real world
Preamplifiers, active analog filters, comparators, and mathematical analog computing circuits.