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Operational Amplifier Stability and Common-Mode Noise Rejection

George Rutkowski, PE

This course includes essential information of operational amplifier (Op Amp) parameters and their stabilities. It emphasizes Op Amp specifications that are published by the manufacturers. Hereís a brief review of material covered in the previous course E272 Operational Amplifier Fundamentals and Design. This review includes Op Amps as used in the design of basic inverting and noninverting amplifiers. And extending beyond this, this course emphasizes performance of practical Op Ampís which can behave in less than the ideal text book versions. These behaviors, inherent instabilities, can be predicted by referring to specified parameters and external conditions such as temperature and power supply variations. You will learn how the effects of these instabilities can be minimized by proper selection of circuit components.

Also, youíll learn how Op Amps are used as differential amplifiers and how this application serves to minimize, if not practically eliminate, induced noise. Time-varying electric and magnetic fields are in every industrial, medical and commercial environment. They induce intolerable noise with amplitudes much larger than the intended signals that are to be amplified. You will learn how differential amplifiers can make this induced noise common mode which differential amplifiers can reject. Ample example problems with solutions are provided that reinforce the concepts covered.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.