Date: Tuesday, February 28 2023
Location: Pi
Time: 10:45 - 12:30
Question of the day
How to we characterize the nonlinear behavior of amplifiers?
Press the button(s) below to test your knowledge and understanding of the topics covered this lecture.
SLiCAP files hearing loop system with determination of the output noise for different configurations: Lecture4.zip
See also the HTML report SLiCAP Hearing Loop Project -4-
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
Amplifier noise behavior with open and shorted input terminals.
Dynamic nonlinear behavior of an amplifier.
Homework 3: Consider a hearing loop system with an instantaneous transadmittance transmitter amplifier and an integrating voltage receiver amplifier. The transadmittance amplifier drives the transmit coil with maximally \(\pm 30\) mA. Please answer the questions below using these specifications:
Determine the requirement for the voltage-drive capability of the transmitter amplifier.
Determine the required gain of the transmitter amplifier.
Determine a show-stopper value for the equivalent-input voltage noise spectral density of the transmitter amplifier (assume white noise).
Determine the required gain of the receiver amplifier.
Determine a show-stopper value for the equivalent-input voltage noise spectral density of the receiver amplifier (assume white noise).
Determine a show-stopper value for the equivalent-input current noise spectral density of the receiver amplifier (assume white noise).
