27-02-2025: Electronics 5#
Date: Thursday, February 27 2025
Location: Boole (36.HB.T0.610)
Time: 08:45 - 10:30
Question of the day
How to we characterize the nonlinear behavior of amplifiers?
Knowledge Test#
Press the button(s) below to test your knowledge and understanding of the topics covered this lecture.
Amplifiers: modeling of nonideal behavior#
Amplifiers: modeling of power losses and energy storage
As all physical systems, amplifiers suffer from power losses and energy storage.
Presentation
The presentation "Amplifiers: power losses and energy storage" introduces high-level modeling techniques for such effects. It also briefly introduces a classification of amplifiers, based on the operation of the stage that drives the load.
Presentation in parts
Amplifiers: power losses and energy storage (parts)
Study
Chapter 2.4.4, 2.4.5
Amplifiers: voltage and current drive capability
The static and dynamic voltage and current drive capabilities of amplifiers are limited.
Presentation
The presentation "Amplifiers: voltage and current drive capability" gives description methods for these effects.
Presentation in parts
Amplifiers: voltage and current drive capability (parts)
Video
Amplifiers: voltage and current drive capability (5:37)
Study
Chapter 2.4.7, 2.4.8, 17.5, 17.7
Amplifiers: modeling of weakly nonlinear behavior
At signal levels below clipping, amplifiers will not behave perfectly linear.
Presentation
The presentation "Amplifiers: modeling of weakly nonlinear behavior" gives description methods for weakly nonlinear behavior.
Presentation in parts
The presentation "Amplifiers: modeling of weakly nonlinear behavior (parts)
Video
Amplifiers modeling of weakly nonlinear behavior (13:03)
Study
Chapter 17.5, 17.7
Demonstration#
Amplifier noise behavior with open and shorted input terminals.
Dynamic nonlinear behavior of an amplifier.
Homework#
Homework 3: Consider a hearing loop system with an instantaneous transadmittance transmitter amplifier and an integrating voltage receiver amplifier. Please answer the questions below:
Determine a show-stopper value for the equivalent-input voltage noise spectral density of the transmitter amplifier (assume white noise).
Determine a show-stopper value for the equivalent-input current noise spectral density of the transmitter amplifier (assume white noise).
Determine a show-stopper value for the equivalent-input voltage noise spectral density of the receiver amplifier (assume white noise and a peak transmit antenna current of 100 mA).
Determine a show-stopper value for the equivalent-input current noise spectral density of the receiver amplifier (assume white noise and a peak transmit antenna current of 100 mA).
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