Chapter 8 FeedbackIntroduction8.1 The general feedback structure8.2Someproperties of negative feedback8.3 The four basic feedback topologies8.4 The series-shunt feedback amplifier8.5 The series-series feedback amplifier8.6 The shunt-shunt and shunt-series feedbackamplifier8.10 Stability study using bode plot8.11 Freguency compensationMicroelectronicCircuits
Microelectronic Circuits 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
IntroductionIt's impossible to think of electronic circuits withoutsomeformsoffeedbackNegativefeedbackDesensitize the gainReducenonlineardistortionReduce theeffectof noiseControl the input and output impedance> Extend the bandwidth of the amplifierThebasicidea ofnegativefeedbackisto tradeoffbetweengainandotherdesirableproperties.Positive feedback will causetheamplifieroscillationMicroelectronic Circuits
Microelectronic Circuits Introduction ⚫ It’s impossible to think of electronic circuits without some forms of feedback. ⚫ Negative feedback ➢ Desensitize the gain ➢ Reduce nonlinear distortion ➢ Reduce the effect of noise ➢ Control the input and output impedance ➢ Extend the bandwidth of the amplifier ⚫ The basic idea of negative feedback is to trade off between gain and other desirable properties. ⚫ Positive feedback will cause the amplifier oscillation
Three Parts: Partl: The basic concept and someProperties of negative feedbackPartll: The four basic feedback and analysis Partlll: The loop gain, stability problemand frequency compensationMicroelectronicCircuits
Microelectronic Circuits Three Parts: ⚫ PartI: The basic concept and some Properties of negative feedback ⚫ PartII: The four basic feedback and analysis ⚫ PartIII: The loop gain, stability problem and frequency compensation
PartIJudgment and PropertiesThe basic conceptoffeedbackexamplesMicroelectronic Circuits
Microelectronic Circuits PartI The basic concept Judgment and Properties of feedback examples
Partl: The basic concept and someProperties of negative feedback8.1TheGeneralFeedbackStructureXSourceLoadThis is a signal-flow diagram, and the quantities x represent either voltage orcurrentsignalsIn electronic circuits, part of or all output signal is fed back toinput, and affects the input signal value, which is called feedback.Microelectronic Circuits
Microelectronic Circuits PartI: The basic concept and some Properties of negative feedback This is a signal-flow diagram, and the quantities x represent either voltage or current signals. In electronic circuits, part of or all output signal is fed back to input, and affects the input signal value, which is called feedback. 8.1 The General Feedback Structure