05-03-2024: Electronics 8

Date: Tuesday, March 05 2024

Location: Chip

Time: 10:45 - 12:30

Question of the day

How do we account for the noise of the feedback networks?

Homework previous lecture

• SLiCAP files hearing loop system design feedback amplifier types: Lecture7.zip

• See also the HTML report SLiCAP Hearing Loop Project -7-

Noise behavior of negative feedback amplifiers

Noise performance of feedback amplifiers

In general, insertion of impedances in series and/or in parallel with the signal path should be avoided. They increase:

• Energy storage and power losses

• Noise

Presentation

The presentation "Influence of Feedback Networks on Noise Performance of Negative Feedback Amplifiers" shows that detrimental effects caused by impedances in the feedback networks can be kept low.

Presentation in parts

Influence of Feedback Networks on Noise Performance of Negative Feedback Amplifiers (parts)

Video

Noise behavior of negative feedback amplifiers (19:42)

Study

Chapter 7.4, 7.5

Exercises

1. Determination of the show-stopper values of feedback elements

Downloads

• Poster: Design of noise performance feedback amplifiers

• SLiCAP: analysis of the noise behavior of feedback amplifiers using complete and simplified noise models

Exercises

• vAmpNoise1

Homework

Homework 6:

• Assign values for the feedback elements of the receive amplifier of the hearing loop system, given a maximum transmitter current drive capability from previous homework.

• Determine the maximum values for the equivalent-input noise voltage spectral density and the equivalent-input noise current spectral density of the controller in the receiver. You may ignore the noise contribution of the transmitter.