A linear integrated circuit offers an infinite number of operating states. The linear IC is an analog device with solid-state. It works over a constant range of input levels. For example, the amplifiers in earphones are linear integrated circuits. These are utilized in numerous applications. It's simple and broadly used by engineers or programmers. Most ICs are made by the monolithic process. This helps in low cost and mass production of ICs. Some key advantages of linear integrated circuits: small size, reduced cost, less weight, low power consumption and high reliability.