Operational Amplifiers
An operational amplifier is a single integrated circuit. This is not an electrical part used by itself, but is embedded in an electrical circuit to perform amplification, filtering, operations and other tasks. If a circuit uses an amplification function, the small signals of sensors or other devices can be amplified to enable processing in subsequent electrical circuits. Circuits that are used other than amplification circuits include operation circuits for operations such as addition, subtraction, differentiation and integration; filter circuits for extracting low-frequency signals, high-frequency signals, or signals within a specific frequency range; and oscillation circuits. Operational amplifiers include both power supply general-purpose types; single power supply types; and CMOS structure types. A general-purpose operational amplifier is comprised of two input terminals (forward rotation input and reverse rotation input) and one output terminal, and positive and negative power supply terminals. Each operational amplifier has its unique amplification factor, and signals can only be amplified within the range of the power supply voltage.