Understanding Oscillators

Chapter Understanding Oscillators

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • CHAPTER 9 OSCILLATORS386 ■ Differentiate between positive and negative feedback. ■ Specify the type of feedback that causes a circuit to oscillate. ■ Specify at least two methods of obtaining feedback in an oscillator circuit. ■ Understand how resonant LC circuits set the frequency of an oscillator. ■ Design a simple oscillator circuit.UNDERSTANDING OSCILLATORS1  An oscillator can be divided into three definite sections: ■ An amplifier ■ The feedback connections ■ The components that set frequencyThe amplifier replaces the switch in the basic oscillator circuit, introduced in problem 35 of Chapter 7 (Figure 7.46).QUESTIONDraw an oscillator circuit, and label the parts. Use a separate sheet of paper for your drawing.ANSWERSee Figure 9.1.CLFeedback pathswitch or amplifierFIGURE 9.1Book Authorc09V107/04/2012 3:23 PM c09.indd 3867/4/2012 3:23:50 PM