Microelectric Circuits by Meiling CHEN 1 Lecture 14 Feedback.

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Presentation transcript:

Microelectric Circuits by Meiling CHEN 1 Lecture 14 Feedback

National United University Department of Electrical Engineering ~ Meiling CHEN topics The series-shunt feedback The series-series feedback The shunt-shunt feedback The shunt-series feedback

National United University Department of Electrical Engineering ~ Meiling CHEN Two port networks Two port Network Type I: Impedance z-parameters

National United University Department of Electrical Engineering ~ Meiling CHEN Type II: Admittance y-parameters Type III: hybrid h-parameters

National United University Department of Electrical Engineering ~ Meiling CHEN Type IV: Inverse-hybrid g-parameters Type V: transmission ABCD parameters

National United University Department of Electrical Engineering ~ Meiling CHEN Type VI: Inverse transmission parameters Two port Network combination: I. Cascade : ABCD parameters

National United University Department of Electrical Engineering ~ Meiling CHEN II: series-shunt

National United University Department of Electrical Engineering ~ Meiling CHEN n Ex: Find v 2 =?

National United University Department of Electrical Engineering ~ Meiling CHEN III: series-series

National United University Department of Electrical Engineering ~ Meiling CHEN IV: Shunt-shunt

National United University Department of Electrical Engineering ~ Meiling CHEN V: shunt-series

National United University Department of Electrical Engineering ~ Meiling CHEN General feedback structure Open loop gain Loop gain Closed-loop gain Mixer network Voltage  series Current  shunt Sampling network Voltage  shunt Current  Series

National United University Department of Electrical Engineering ~ Meiling CHEN Negative feedback properties Gain desensitivity Bandwidth extension Noise reduction Nonlinear distortion reduction

National United University Department of Electrical Engineering ~ Meiling CHEN 1.Gain desensitivity 2.Bandwidth extension

National United University Department of Electrical Engineering ~ Meiling CHEN 3.Noise reduction

National United University Department of Electrical Engineering ~ Meiling CHEN

Figure 8.3 Illustrating the application of negative feedback to reduce the nonlinear distortion in amplifiers. Curve (a) shows the amplifier transfer characteristic without feedback. Curve (b) shows the characteristic with negative feedback (   0.01) applied. 4.Nonlinear distortion reduction (a) without feedback (b) with feedback

National United University Department of Electrical Engineering ~ Meiling CHEN Mixer network: Voltage  series Current  shunt Sampling Feedback Topology

National United University Department of Electrical Engineering ~ Meiling CHEN Sampling network : Voltage  shunt Current  Series

National United University Department of Electrical Engineering ~ Meiling CHEN series shunt voltage current voltage shunt

National United University Department of Electrical Engineering ~ Meiling CHEN voltage shunt series current series voltage

National United University Department of Electrical Engineering ~ Meiling CHEN shunt current Shunt series

National United University Department of Electrical Engineering ~ Meiling CHEN Series- shunt

National United University Department of Electrical Engineering ~ Meiling CHEN voltage-mixing voltage-sampling (series–shunt) topology

National United University Department of Electrical Engineering ~ Meiling CHEN current-mixing current-sampling (shunt–series) topology

National United University Department of Electrical Engineering ~ Meiling CHEN voltage-mixing current-sampling (series–series) topology

National United University Department of Electrical Engineering ~ Meiling CHEN current-mixing voltage-sampling (shunt–shunt) topology

National United University Department of Electrical Engineering ~ Meiling CHEN The series–shunt feedback amplifier

National United University Department of Electrical Engineering ~ Meiling CHEN Passive network h 21 tends to zero

National United University Department of Electrical Engineering ~ Meiling CHEN

Series -Shunt

National United University Department of Electrical Engineering ~ Meiling CHEN The series–series feedback amplifier

National United University Department of Electrical Engineering ~ Meiling CHEN

Figure 8.15 (Continued) (c) A redrawing of the circuit in (b) with z 21 neglected. Series -Series

National United University Department of Electrical Engineering ~ Meiling CHEN

the shunt–shunt feedback amplifier

National United University Department of Electrical Engineering ~ Meiling CHEN

 Shunt -Shunt

National United University Department of Electrical Engineering ~ Meiling CHEN

The shunt–series feedback amplifier

National United University Department of Electrical Engineering ~ Meiling CHEN

Shunt -Series

National United University Department of Electrical Engineering ~ Meiling CHEN

TypeAmplifierFeedback parameter Series-Shunt (voltage- voltage) Series-Series (voltage- current) Shunt-Shunt (current- voltage) shunt-series (current- current)

National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.1 Step 0 : Series-shunt feedback amplifier Step 1 : Amplifier analysis Amplifier  Voltage amplifier Feedback  h parameters

National United University Department of Electrical Engineering ~ Meiling CHEN Step 2 : Feedback network analysis

National United University Department of Electrical Engineering ~ Meiling CHEN Step 3 : Amp+Feedback analysis Feedback AMP

National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.2 Step 0 : Series-series feedback amplifier Amplifier  Transconductance amplifier Feedback  z parameters

National United University Department of Electrical Engineering ~ Meiling CHEN Step 1 : Amplifier analysis

National United University Department of Electrical Engineering ~ Meiling CHEN Step 2 : Analysis feedback Amp The equivalent circuit

National United University Department of Electrical Engineering ~ Meiling CHEN Step 3 : Amp+Feedback analysis

National United University Department of Electrical Engineering ~ Meiling CHEN Example 8.3 Shunt-shunt: R m amplifier + y parameter

National United University Department of Electrical Engineering ~ Meiling CHEN

Example DC analysis

National United University Department of Electrical Engineering ~ Meiling CHEN Shunt-series current Mixing – current sampling Amplifier: Current Amplifier Feedback network: hybrid parameters

National United University Department of Electrical Engineering ~ Meiling CHEN

neglect

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