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A linear integrated circuit (linear IC) is a solid-state analog device that is theoretically an infinite number of potential operating states. It is running continuous range of input levels. On the contrary, a digital IC has a limited number of discrete input and output states.

Within a certain input range, the state of amplification of a linear IC is a straight line; Input and output volts are directly proportional. The best known, and most common, linear IC operating amplifier or op amp, are those of resistors, diodes and transistors in a conventional analog circuit. There are two inputs called, which are called and not in-inviting. The signal that applies to inputting input results in the signal of the opposite phase on the output. A signal applied to non-invoking input produces a sign of similar phase in the output. A connection, through a variable resistance, is used to control the amplification factor between the output and the inverting input.

Working in linear ICs audio amplifiers, A / D (analog-to-digital) converters, amplifiers, with separate, DC (direct-current) amplifier, integrator, multivibrator, oscillator, audio filter, and sweep generator Do the work. Linear ICs are available in the largest electronic stores. Some devices have many amplifiers within single housing.