CHAPTER 7
Amplifiers and Feedback
We will cover some basic concepts of negative feedback first before showing some of the amplifier circuits employing negative feedback. For most amplifiers, negative feedback is used for a variety of purposes that include setting the gain of the amplifier with a couple of resistors, reducing distortion, and increasing frequency response, just to name a few. Voltage-controlled amplifiers are often used with negative-feedback systems such as automatic gain control circuits, and an automatic level control amplifier for audio signals will be presented. Finally, we will present a couple of examples where positive feedback ...
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