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Feedback Electronics, 2009

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Autor: Guillermo Carpintero del Barrio
This course presents the basics of electronic circuits with feedback.
Feedback Electronics Course Image


Tecnología Electrónica Department
Universidad Carlos III de Madrid

4th course
Ingeniería Industrial

December 2009

New York Times, 1927

Classroom lectures (12h), Exercises (8h) and Laboratory (4h).



The student is assumed to have background in electronics, with skills to analyze the bias point of transistor circuits (BJT, JFET, MOS), and calculate the frequency response set by DC isolation (low end) and parasitic (high end) capacitors.



The goal of the course is to take the students from the active amplifiers designed with different trasistor types, into the concept of negative feedback. This is a fundamental technique in engineering electronics to reduce the impact of the parameter dispersion of the transistor (component) onto the amplifier (system) characteristics: gain, input impedance and output impedance. Once the advantages of negative feedback are clear, and the analysis techniques explained, the course covers a major issue of of feedback. The impact of feedback on the amplifier stability, through the appearance of positive feedback at given frequencies. Means to overcome oscillation are shown.

The last part of the course deals with the use designing circuits with positive feedback to develop linear oscillators, in which a signal at a desired frequency is self generated.



Analysis and design of feedback amplifiers.

Analysis and design of oscillator circuits.



Handouts are included for the students to assess their level of understanding of the subject. These can be used by instructors to grade the work of the students during the course (recomended weighting 40%), and a final exam is recomended (60%).


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