Chapter 8 - Feedback 1 - Desensitize The Gain 2 - Reduce Nonlinear Distortions 3 - Reduce The Effect of Noise 4 – Control The Input And Output Impedances.

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Presentation transcript:

Chapter 8 - Feedback 1 - Desensitize The Gain 2 - Reduce Nonlinear Distortions 3 - Reduce The Effect of Noise 4 – Control The Input And Output Impedances 5 – Extend The Bandwidth Of The Amplifier

The General Feedback Structure A

MATLAB / SIMULINK Anyone interested to put together an Introduction to MATLAB / Simulink PowerPoint Presentation plus some examples?

The General Feedback Structure Exercise 8.1

The General Feedback Structure Exercise 8.1

Some Properties of Negative Feedback Gain Desensitivity

Some Properties of Negative Feedback Bandwidth Extension

Some Properties of Negative Feedback Noise Reduction, Reduction of Nonlinear Distortion Read and discuss in class

The Four Basic Feedback Topologies Voltage Amplifiers (V/V) Current Amplifiers (I/I) Transconductance Amplifiers (I/V) Transresistance Amplifiers (V/I)

The four basic feedback topologies: (a) voltage-sampling series-mixing (series-shunt) topology; (b) current-sampling shunt-mixing (shunt-series) topology; (c) current-sampling series-mixing (series-series) topology; (d) voltage-sampling shunt-mixing (shunt-shunt) topology. The Four Basic Feedback Topologies

Voltage Amplifiers VCVS Input Resistance High Output Resistance Low Feedback sample the output voltage Voltage-sampling series-mixing Current Amplifiers Transconductance Amplifiers Transresistance Amplifiers

The Shunt-Series Feedback Amplifier The Ideal Situation The series-shunt feedback amplifier: (a)ideal structure; (b)equivalent circuit.

The Shunt-Series Feedback Amplifier The Practical Situation Derivation of the A circuit and  circuit for the series-shunt feedback amplifier. (a) Block diagram of a practical series-shunt feedback amplifier. (b)The circuit in (a) with the feedback network represented by its h parameters. (c)(c) The circuit in (b) after neglecting h 21.

The Shunt-Series Feedback Amplifier Summary For Finding the A Circuit  for a given series-shunt feedback amplifier.

The Shunt-Series Feedback Amplifier Example 8.1

The Shunt-Series Feedback Amplifier Exercise 8.4

The Series-Series Feedback Amplifier The Ideal Case

The Series-Series Feedback Amplifier The Ideal Practical Case

The Series-Series Feedback Amplifier For Finding the A Circuit  for a given series-series feedback amplifier

The Series-Series Feedback Amplifier Example 8.2

The Series-Series Feedback Amplifier Example 8.2

The Series-Series Feedback Amplifier Example 8.2

The Series-Series Feedback Amplifier Example 8.2

The Shunt-Shunt and Shunt-Series Feedback Amplifiers Shunt Configuration

The Shunt-Shunt and Shunt-Series Feedback Amplifiers

Example 8.3

The Shunt-Series Feedback Amplifier

Example 8.4

The Shunt-Series Feedback Amplifier Example 8.4

Determining Loop Gain

The Stability Problem and Margins Closed-Loop Transfer Function Nyquist Root-Locus Bode

The Stability Problem and Margins Closed-Loop Transfer Function Nyquist Root-Locus Bode

The Nyquist Plot

Effect of Feedback On The Amplifier Poles

Stability Study Using Bode Plots

Frequency Compensation

Spice Simulation Examples

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