While in the process of reviewing Texas Instruments applications notes, including those from the recently acquired Burr-Brown ? I uncovered a couple of treasures, this handbook on active RC networks and one on op amp applications. These old publications, from 1966 and 1963, respectively, are some of the finest works on op amp theory that I have ever seen. Nevertheless, they contain some material that is hopelessly outdated. This includes everything from the state of the art of amplifier technology, to the parts referenced in the document ? even to the symbol used for the op amp itself:
These numbers in the circles referred to pin numbers of old op amps, which were potted modules instead of integrated circuits. Many references to these numbers were made in the text, and these have been changed, of course.
In revising this document, I chose to take a minimal approach to the material out of respect for the original author - L.P. Huelsman, leaving as much of the original material in tact as possible while making the document relevant to present day designers. I did clean up grammatical and spelling mistakes in the original. I even elected to leave the original RC stick figure illustrations, which have minimal technical content ? but added to the readability of the document.