Operational Amplifiers. Design and Applications

Аннотация

The term “operational amplifier” was apparently coined by John R. Ragazzini, and colleagues, in a paper1 published by the IRE in May of 1947. The paper described the basic properties of such amplifiers when used with linear and nonlinear feedback and was based on work performed in 1943 and 1944 for the National Defense Research Council. This, and most other early work with operational amplifiers, concentrated heavily on their use in analog simulations and in the solution of integro-differential equations. Credit for much of the initial development of the operational concept must go to George A. Philbrick who worked as a technical aide on the NDRC work described above, and who later was instrumental in the development of the first commercial “plug-in” operational amplifiers—using vacuum tubes.