Introduction :
The op amp is one of the basic building blocks of linear design. In its classic form it consists of two input terminals, one of which inverts the phase of the signal, the other preserves the phase, and an output terminal. The standard symbol for the op amp is given in Figure. This ignores the power supply terminals, which are obviously required for operation.
Figure : Standard op amp symbol
The name “op amp” is the standard abbreviation for operational amplifier. This name comes from the early days of amplifier design, when the op amp was used in analog computers. (Yes, the first computers were analog in nature, rather than digital). When the basic amplifier was used with a few external components, various mathematical “operations” could be performed. One of the primary uses of analog computers was during WWII, when they were used for plotting ordinance trajectories.
The op amp is one of the basic building blocks of linear design. In its classic form it consists of two input terminals, one of which inverts the phase of the signal, the other preserves the phase, and an output terminal. The standard symbol for the op amp is given in Figure. This ignores the power supply terminals, which are obviously required for operation.
Figure : Standard op amp symbol
The name “op amp” is the standard abbreviation for operational amplifier. This name comes from the early days of amplifier design, when the op amp was used in analog computers. (Yes, the first computers were analog in nature, rather than digital). When the basic amplifier was used with a few external components, various mathematical “operations” could be performed. One of the primary uses of analog computers was during WWII, when they were used for plotting ordinance trajectories.
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