Chapter 8 Feedback2 - Chapter 8 Feedback Introduction 8.1...

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Chapter 8 Feedback Introduction 8.1 The general feedback structure 8.2 Some properties of negative feedback 8.3 The four basic feedback topologies 8.4 The series-shunt feedback amplifier 8.5 The series-series feedback amplifier 8.6 The shunt-shunt and shunt-series feedback amplifier 8.10 Stability study using bode plot 8.11 Frequency compensation
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8.4 The Series-Shunt Feedback Amplifi er The ideal situation The practical situation Summary
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The Ideal Situation Ø A unilateral open-loop amplifier (A circuit). Ø An ideal voltage mixing voltage sampling feedback network (β circuit). Ø Assumption that the source and load resistance have been included inside the A circuit.
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The Ideal Situation Equivalent circuit. Rif and Rof denote the input and output resistance with feedback.
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Input and Output Resistance with Feed back Input resistance In this case, the negative feedback increases the input resistanc e by a factor equal to the amount of feedback. Output resistance ) 1 ( β A R R i if + = A R R o of + = 1
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Ø Block diagram of a practical series–shunt feedback amplifier. Ø
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Chapter 8 Feedback2 - Chapter 8 Feedback Introduction 8.1...

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